The Experts below are selected from a list of 366 Experts worldwide ranked by ideXlab platform
Byunggee Kim - One of the best experts on this subject based on the ideXlab platform.
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development of high performance Polyurethane elastomers using vanillin based green polyol chain extender originating from lignocellulosic biomass
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Haemin Gang, Daewoo Lee, Kwonyoung Choi, Hanna Kim, Hoon Ryu, Daisoo Lee, Byunggee KimAbstract:Vanillin can be obtained from waste of lignocellulosic bioresources with various methods.1−3 Such vanillin was used as chain extender [divanillin-ethanol amine conjugate (DV-EA)] after its dimerization and further modification with ethanolamine in the synthesis of Biobased Polyurethane, thereby increasing wt % of biocontents in the final polymer. 1,4-Butanediol often used as a general chain extender in Polyurethane synthesis was replaced partially with DV-EA. The generated Polyurethane hard segment consists of DV-EA polyol and MDI (methylene diisocyanate) units or 1,4-butanediol and MDI units, respectively. The properties of the DV-EA-based Polyurethane were investigated with differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analyzer (DMA), X-ray diffraction spectroscopy (XRD), and universal testing machine (UTM). The results showed that this advanced Polyurethane has 128% of Young’s modulus and 147% of increased strain compared to those of control, while its st...
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Development of High Performance Polyurethane Elastomers Using Vanillin-Based Green Polyol Chain Extender Originating from Lignocellulosic Biomass
2017Co-Authors: Haemin Gang, Daewoo Lee, Kwonyoung Choi, Hanna Kim, Hoon Ryu, Daisoo Lee, Byunggee KimAbstract:Vanillin can be obtained from waste of lignocellulosic bioresources with various methods.− Such vanillin was used as chain extender [divanillin-ethanol amine conjugate (DV-EA)] after its dimerization and further modification with ethanolamine in the synthesis of Biobased Polyurethane, thereby increasing wt % of biocontents in the final polymer. 1,4-Butanediol often used as a general chain extender in Polyurethane synthesis was replaced partially with DV-EA. The generated Polyurethane hard segment consists of DV-EA polyol and MDI (methylene diisocyanate) units or 1,4-butanediol and MDI units, respectively. The properties of the DV-EA-based Polyurethane were investigated with differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analyzer (DMA), X-ray diffraction spectroscopy (XRD), and universal testing machine (UTM). The results showed that this advanced Polyurethane has 128% of Young’s modulus and 147% of increased strain compared to those of control, while its strength and thermal stability were maintained. It is expected that this new Biobased tetraol may inspire a new perspective of vanillin application in Biobased Polyurethane synthesis
Haemin Gang - One of the best experts on this subject based on the ideXlab platform.
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development of high performance Polyurethane elastomers using vanillin based green polyol chain extender originating from lignocellulosic biomass
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Haemin Gang, Daewoo Lee, Kwonyoung Choi, Hanna Kim, Hoon Ryu, Daisoo Lee, Byunggee KimAbstract:Vanillin can be obtained from waste of lignocellulosic bioresources with various methods.1−3 Such vanillin was used as chain extender [divanillin-ethanol amine conjugate (DV-EA)] after its dimerization and further modification with ethanolamine in the synthesis of Biobased Polyurethane, thereby increasing wt % of biocontents in the final polymer. 1,4-Butanediol often used as a general chain extender in Polyurethane synthesis was replaced partially with DV-EA. The generated Polyurethane hard segment consists of DV-EA polyol and MDI (methylene diisocyanate) units or 1,4-butanediol and MDI units, respectively. The properties of the DV-EA-based Polyurethane were investigated with differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analyzer (DMA), X-ray diffraction spectroscopy (XRD), and universal testing machine (UTM). The results showed that this advanced Polyurethane has 128% of Young’s modulus and 147% of increased strain compared to those of control, while its st...
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Development of High Performance Polyurethane Elastomers Using Vanillin-Based Green Polyol Chain Extender Originating from Lignocellulosic Biomass
2017Co-Authors: Haemin Gang, Daewoo Lee, Kwonyoung Choi, Hanna Kim, Hoon Ryu, Daisoo Lee, Byunggee KimAbstract:Vanillin can be obtained from waste of lignocellulosic bioresources with various methods.− Such vanillin was used as chain extender [divanillin-ethanol amine conjugate (DV-EA)] after its dimerization and further modification with ethanolamine in the synthesis of Biobased Polyurethane, thereby increasing wt % of biocontents in the final polymer. 1,4-Butanediol often used as a general chain extender in Polyurethane synthesis was replaced partially with DV-EA. The generated Polyurethane hard segment consists of DV-EA polyol and MDI (methylene diisocyanate) units or 1,4-butanediol and MDI units, respectively. The properties of the DV-EA-based Polyurethane were investigated with differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analyzer (DMA), X-ray diffraction spectroscopy (XRD), and universal testing machine (UTM). The results showed that this advanced Polyurethane has 128% of Young’s modulus and 147% of increased strain compared to those of control, while its strength and thermal stability were maintained. It is expected that this new Biobased tetraol may inspire a new perspective of vanillin application in Biobased Polyurethane synthesis
Yuechao Yang - One of the best experts on this subject based on the ideXlab platform.
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nano soy protein microcapsule enabled self healing bioPolyurethane coated controlled release fertilizer preparation performance and mechanism
Materials Today Chemistry, 2021Co-Authors: Yuechao Yang, Bin Gao, Yongshan Wan, Jiazhuo Xie, Chun Wang, G Shi, Dongdong Cheng, Tianlin Shen, Shanmin HouAbstract:Abstract Although various eco-friendly and sustainable Biobased Polyurethane-coated controlled-release fertilizers (BPCFs) have been developed, their applications were limited by the bio-based coating contained many microscopic holes. In this work, a nano-soy-protein microcapsule-enabled self-healing bioPolyurethane-coated controlled-release fertilizer (NSBCF) with enhanced controlled-release performance was fabricated. Nanoscale soy-protein microcapsules (SMCs) were prepared from soy-protein isolate (SPI) and poly (lactic-co-glycolic acid) using the water-oil-water emulsification technology. The self-healing biopolymer coatings of NSBCF with uniformly dispersed SMCs were constructed through self-assembly. The controlled-release longevity of NSBCF was >28 days longer than that of the BPCF with the unmodified coating. The self-healing mechanism of NSBCF was determined by directly observing the restoration area and the 3D pore distribution of coating using fluorescence labeling and X-ray computed tomography. After being released from the SMCs, SPI self-repaired the coating by reacting with glutaraldehyde to form solid resins to clog the microscopic holes. The SMCs-enabled self-healing process successfully reduced the nutrient release rate and extended the nutrient release longevity of NSBCF. This novel Biobased controlled-released fertilizer with self-healing function represents a new direction for the development of high efficiency and environmentally friendly fertilizers to improve agriculture and food sustainability.
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environmentally friendly slow release urea fertilizers based on waste frying oil for sustained nutrient release
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Xiaoqi Liu, Yuechao Yang, Bin Gao, Yongshan WanAbstract:Novel Biobased Polyurethane (PU) was synthesized by using waste frying oil-based polyol (WFOP) and isocyanate for slow-release fertilizers (SRFs). Epoxy resin (EP) was used to modify PU to synthesize the interpenetrating network (IPN) for improving the properties of the coating film. Nine polymer-coated nitrogen (N) fertilizers were prepared from these composite coating materials. The N release characteristics of the PU-coated urea (PCU) in water and soil were determined. Degradation behavior of coatings in the soil was evaluated. Results showed that 20% EP in the coating increased the cross-linking density by 77.9%, reduced the coating porosity by 28%, and thus slowed the nutrient release from the PCU significantly. Because of its compact structure, the water absorption rate of the EP-modified PCU shell was slower than that of the unmodified ones. All the PCUs, especially the EP-modified ones, showed excellent slow N release behaviors. In addition, the biopolymers derived from waste frying oil also displ...
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Biomimetic Superhydrophobic Biobased Polyurethane-Coated Fertilizer with Atmosphere “Outerwear”
2017Co-Authors: Jiazhuo Xie, Yuechao Yang, Bin Gao, Yongshan Wan, Qinghua ZhaoAbstract:The development of efficient Biobased controlled-release fertilizers has captured much research attention because of the environmental concerns and food scarcity problems. In this work, a biomimetic superhydrophobic Biobased Polyurethane-coated fertilizer (SBPF) was successfully fabricated by increasing surface roughness and reducing surface energy of Polyurethane (PU) coating. The green PU coating was synthesized from low-cost, biodegradable, and renewable cottonseed oil. The nutrient release longevity of SBPF revealed 2-fold enhancement compared with the normal Biobased PU-coated fertilizer (BPF). The significant improvement of nutrient release characteristics can be attributed to the atmosphere “outerwear” which ensured the nonwetting contact of water with superhydrophobic surfaces in gas state instead of in liquid state. The new concept introduced in this study can inform the development of the next generation of Biobased controlled release fertilizers
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Biobased polymer composites derived from corn stover and feather meals as double coating materials for controlled release and water retention urea fertilizers
Journal of Agricultural and Food Chemistry, 2013Co-Authors: Yuechao Yang, Zhaohui Tong, Yuqing Geng, Min ZhangAbstract:In this paper, we synthesized a Biobased Polyurethane using liquefied corn stover, isocyanate, and diethylenetriamine. The synthesized Polyurethane was used as a coating material to control nitrogen (N) release from polymer-coated urea. A novel superabsorbent composite was also formulated from chicken feather protein (CFP), acrylic acid, and N,N'-methylenebisacrylamide and used as an outer coating material for water retention. We studied the N release characteristics and water-retention capability of the double-layer polymer-coated urea (DPCU) applied in both water and soils. The ear yields, dry matter accumulation, total N use efficiency and N leaching from a sweet corn soil-plant system under two different irrigation regimes were also investigated. Comparison of DPCU treatments with conventional urea fertilizer revealed that DPCU treatments reduced the N release rate and improved water retention capability. Evaluation of soil and plant characteristics within the soil-plant system revealed that DPCU application effectively reduced N leaching loss, improved total N use efficiency, and increased soil water retention capability.
Min Zhang - One of the best experts on this subject based on the ideXlab platform.
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maize yield and root morphological characteristics affected by controlled release diammonium phosphate and paecilomyces variotii extracts
Field Crops Research, 2020Co-Authors: Qi Chen, Zhiguang Liu, Hongyin Zhou, Min ZhangAbstract:Abstract Application of conventional phosphorus (P) fertilizer poses great concern due to its low P efficiency and potential eutrophication of P in sensitive waters. A novel biostimulant, Paecilomyces variotii extract (ZNC), with functionality of improving nutrient uptakes of crops, was integrated with diammonium phosphate coated with Biobased Polyurethane polymer in a three-year field trial. The objectives were to explore the effects and mechanisms of the controlled-release diammonium phosphate (CRP), ZNC and their combination on P use efficiency (PUE), economic benefit, soil P supply, and root growth and yield of maize (Zea mays L., Zhengdan ‘958’). The experiment consisted of five treatments: regular diammonium phosphate (DAP); CRP with release longevity of three months (CDAP); regular diammonium phosphate combined with ZNC (DAPZ); CRP combined with ZNC (CDAPZ); and no added P fertilizer (Control), each with three replicates. The results indicated that CDAP and DAPZ treatments significantly increased average yield by 9.65 % and 3.56 %, and PUE by 7.72 % and 3.32 %, respectively, when compared with DAP treatment. Similarly, the average soil available-P of CDAP and DAPZ treatments was increased by 10.0 % and 45.9 % at 0−40 cm soil depth. Furthermore, CDAP and DAPZ treatments significantly increased maize total root length by 178.2 % and 223.6 %, and bleeding sap rate by 23.3 % and 32.5 %, respectively, at the jointing stage. However, the average maize yield and net income of combined CDAPZ treatment had no significant difference relative to CDAP and DAPZ treatments. Moreover, the total root length of CDAPZ treatment was reduced by 16.0 % and 27.8 %, compared to CDAP and DAPZ treatments. Hence the application of CRP or ZNC could increase maize yield by improving soil P supply intensity to meet maize P demand and promoting root morphological characteristics and vitality. However, the combination of CRP and ZNC did not demonstrate significant synergies on yield improvement and root growth promotion. Further research is needed for the development and application of biostimulant enhanced fertilizer as a green environmental technology.
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Biobased Polyurethane, Epoxy Resin, and Polyolefin Wax Composite Coating for Controlled-Release Fertilizer
2019Co-Authors: Hongyu Tian, Min Zhang, Zhiguang Liu, Yanle Guo, Lei ZhengAbstract:Reducing the use of petrochemical products in coated controlled-release fertilizers while regulating the release rate is a popular research topic in the field of controlled-release fertilizers. In this study, a novel Biobased Polyurethane (BPU), epoxy resin (ER), and polyolefin wax (PW) composite coating method for the controlled release of urea was successfully established. The method involved: (1) the use of PW as a modified inner coating, which improved fertilizer surface performance and reduced urea surface roughness; (2) the degradable BPU film was synthesized with liquefied starch (LS) as the outer coating material; and (3) epoxy resin is a protective layer, which improved the hydrophobicity of the coated urea for controlled release. The chemical structure, thermostability and microscopic morphology of composite-coated urea (CCU) were examined by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM), respectively. A central composite design of response surface methodology was used to examine the effects of different film percentage, PW contents, and BPU/ER ratios on nutrient release behavior. The results showed that PW optimized the fluidity, thermal insulation properties, and microscopic surface of the particles and improved the uniformity of the heating of urea. When the same amount of ER was used, the CCU showed a 3-fold increase in the release period compared to that of the cross-linked interpenetrating coated urea. Polynomial mathematical models were established for CCU preparation and could be an effective tool for manufacturing CCUs with specific nutrient release characteristics that could meet the nutrient requirements of crops in different cropping systems. The new coating method introduced in this study could guide the development of a new generation of Biobased controlled-release fertilizers
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Biobased polymer composites derived from corn stover and feather meals as double coating materials for controlled release and water retention urea fertilizers
Journal of Agricultural and Food Chemistry, 2013Co-Authors: Yuechao Yang, Zhaohui Tong, Yuqing Geng, Min ZhangAbstract:In this paper, we synthesized a Biobased Polyurethane using liquefied corn stover, isocyanate, and diethylenetriamine. The synthesized Polyurethane was used as a coating material to control nitrogen (N) release from polymer-coated urea. A novel superabsorbent composite was also formulated from chicken feather protein (CFP), acrylic acid, and N,N'-methylenebisacrylamide and used as an outer coating material for water retention. We studied the N release characteristics and water-retention capability of the double-layer polymer-coated urea (DPCU) applied in both water and soils. The ear yields, dry matter accumulation, total N use efficiency and N leaching from a sweet corn soil-plant system under two different irrigation regimes were also investigated. Comparison of DPCU treatments with conventional urea fertilizer revealed that DPCU treatments reduced the N release rate and improved water retention capability. Evaluation of soil and plant characteristics within the soil-plant system revealed that DPCU application effectively reduced N leaching loss, improved total N use efficiency, and increased soil water retention capability.
Daisoo Lee - One of the best experts on this subject based on the ideXlab platform.
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development of high performance Polyurethane elastomers using vanillin based green polyol chain extender originating from lignocellulosic biomass
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Haemin Gang, Daewoo Lee, Kwonyoung Choi, Hanna Kim, Hoon Ryu, Daisoo Lee, Byunggee KimAbstract:Vanillin can be obtained from waste of lignocellulosic bioresources with various methods.1−3 Such vanillin was used as chain extender [divanillin-ethanol amine conjugate (DV-EA)] after its dimerization and further modification with ethanolamine in the synthesis of Biobased Polyurethane, thereby increasing wt % of biocontents in the final polymer. 1,4-Butanediol often used as a general chain extender in Polyurethane synthesis was replaced partially with DV-EA. The generated Polyurethane hard segment consists of DV-EA polyol and MDI (methylene diisocyanate) units or 1,4-butanediol and MDI units, respectively. The properties of the DV-EA-based Polyurethane were investigated with differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analyzer (DMA), X-ray diffraction spectroscopy (XRD), and universal testing machine (UTM). The results showed that this advanced Polyurethane has 128% of Young’s modulus and 147% of increased strain compared to those of control, while its st...
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Development of High Performance Polyurethane Elastomers Using Vanillin-Based Green Polyol Chain Extender Originating from Lignocellulosic Biomass
2017Co-Authors: Haemin Gang, Daewoo Lee, Kwonyoung Choi, Hanna Kim, Hoon Ryu, Daisoo Lee, Byunggee KimAbstract:Vanillin can be obtained from waste of lignocellulosic bioresources with various methods.− Such vanillin was used as chain extender [divanillin-ethanol amine conjugate (DV-EA)] after its dimerization and further modification with ethanolamine in the synthesis of Biobased Polyurethane, thereby increasing wt % of biocontents in the final polymer. 1,4-Butanediol often used as a general chain extender in Polyurethane synthesis was replaced partially with DV-EA. The generated Polyurethane hard segment consists of DV-EA polyol and MDI (methylene diisocyanate) units or 1,4-butanediol and MDI units, respectively. The properties of the DV-EA-based Polyurethane were investigated with differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analyzer (DMA), X-ray diffraction spectroscopy (XRD), and universal testing machine (UTM). The results showed that this advanced Polyurethane has 128% of Young’s modulus and 147% of increased strain compared to those of control, while its strength and thermal stability were maintained. It is expected that this new Biobased tetraol may inspire a new perspective of vanillin application in Biobased Polyurethane synthesis