The Experts below are selected from a list of 13371 Experts worldwide ranked by ideXlab platform
Baohua Guo - One of the best experts on this subject based on the ideXlab platform.
-
isomorphism in poly butylene succinate co butylene fumarate and its application as polymeric Nucleating Agent for poly butylene succinate
Macromolecules, 2012Co-Authors: Ruidong Wang, Jin Liu, Baohua GuoAbstract:Strict isomorphism between butylene succinate and butylene fumarate in poly(butylene succinate-co-butylene fumarate) (PBSF) was revealed by DSC and wide-angle X-ray diffraction results. They adopt the same crystal modification, with only a little difference in crystal lattice parameters. The melting point of the copolymer increases linearly with increasing molar ratio of butylene fumarate and the melting enthalpy hardly changes, which meet the requirement of strict isomorphism. The introduction of unsaturated comonomer, fumaric acid, into PBS can enhance the total crystallization rate and the radial growth rate of spherulites. Consequently, PBF and PBSF are highly efficient polymeric Nucleating Agents for PBS and its copolymers. In this work, strict isomorphism provides us a new method to find polymeric Nucleating Agent.
Kancheng Mai - One of the best experts on this subject based on the ideXlab platform.
-
crystallization behavior and melting characteristics of pp nucleated by a novel supported β Nucleating Agent
Polymer, 2008Co-Authors: Zishou Zhang, Zhugen Yang, Chunguang Wang, Chunyan Chen, Kancheng MaiAbstract:The β-nucleated PP with high β-PP content was prepared by a novel supported β-Nucleating Agent, which was prepared with pimelic acid supported on nano-CaCO3 as support. The influences of the content of the support and supported β-Nucleating Agent, pre-melting temperature (Tmelt) and scan rates on crystallization behavior and melting characteristics, and the β-PP content of β-nucleated PP were determined by Differential Scanning Calorimeter (DSC) and Wide-Angle X-ray Diffraction (WAXD). The results indicated that the addition of supported β-Nucleating Agent markedly increased the crystallization temperature (Tc) of PP. Increasing the content of supported β-Nucleating Agent slightly increased the Tc, but had no influence on the melting temperatures (Tm) of β-nucleated PP. The Tc and Tm of β-nucleated PP decreased slightly with increasing the content of the support nano-CaCO3. The effects of scan rates and multiple scans with different Tmelt on the crystallization and melting behavior of PP nucleated by supported β-Nucleating Agent are similar to that of PP nucleated by calcium pimelate (CaHA). The β-PP content above 90 percent was obtained in PP nucleated by supported β-Nucleating Agent and was not influenced by the content of nano-CaCO3. The supported β-Nucleating Agent prepared by supporting pimelic acid on nano-CaCO3 is a β-Nucleating Agent with high efficiency and selectivity, and low cost.
-
Preparation and characteristics of nano-CaCO3 supported β-Nucleating Agent of polypropylene
European Polymer Journal, 2008Co-Authors: Zishou Zhang, Youji Tao, Zhugen Yang, Kancheng MaiAbstract:In this paper, nano-CaCO3 supported β-Nucleating Agent for polypropylene (PP) was prepared by supporting pimelic acid on nano-CaCO3 with two methods. The thermal properties of pimelic acid and nano-CaCO3 supported β-Nucleating Agent were investigated by differential scanning calorimetry and thermogravimetry coupled with Fourier transform infrared spectrometry. The results indicated that the formation of β-Nucleating Agent supported on nano-CaCO3 was attributed to the chemical reaction between nano-CaCO3 and pimelic acid. The β-Nucleating Agent was added to PP to examine its β-Nucleating ability for PP, the polymorphism of the PP was characterized by wide-angle X-ray diffractometer. The results of investigation showed that the nano-CaCO3 supported β-Nucleating Agent exhibited higher nucleation ability and lower price compared to calcium pimelate β-Nucleating Agent.
-
Study of nucleation activity and application of a Nucleating Agent to copolypropylene
Journal of Applied Polymer Science, 2006Co-Authors: Kancheng MaiAbstract:The influences of Nucleating Agent content on crystallization peak temperature, crystallization curve shape, crystallization onset temperature, and crystallinity of a copolypropylene were studied in detail by differential scanning calorimetry. The results showed that crystallization onset temperature and crystallization peak temperature increased 17°C–22°C and 15°C–19°C, respectively, with increasing Nucleating Agent content. The behavior of the Nucleating Agent showed excellent efficiency. But the shape of the crystallization curve broadened with increasing Nucleating Agent content, and the crystallinity came to an extremum when the Nucleating Agent content was 0.2%. These results generally differed from those for crystallization of i-PP by a Nucleating Agent. Modification of copolypropylene was studied by use of a Nucleating Agent, and the characteristics of the effects of the Nucleating Agent on copolypropylene were mastered. The results showed that the hardness of a copolypropylene improved observably. So the abrasion resistance of biaxially oriented polypropylene (BOPP) film for cigarette packaging was improved by adopting the modified copolypropylene as the skin-layer heat-seal material of BOPP film. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101:3915–3919, 2006
Ruidong Wang - One of the best experts on this subject based on the ideXlab platform.
-
isomorphism in poly butylene succinate co butylene fumarate and its application as polymeric Nucleating Agent for poly butylene succinate
Macromolecules, 2012Co-Authors: Ruidong Wang, Jin Liu, Baohua GuoAbstract:Strict isomorphism between butylene succinate and butylene fumarate in poly(butylene succinate-co-butylene fumarate) (PBSF) was revealed by DSC and wide-angle X-ray diffraction results. They adopt the same crystal modification, with only a little difference in crystal lattice parameters. The melting point of the copolymer increases linearly with increasing molar ratio of butylene fumarate and the melting enthalpy hardly changes, which meet the requirement of strict isomorphism. The introduction of unsaturated comonomer, fumaric acid, into PBS can enhance the total crystallization rate and the radial growth rate of spherulites. Consequently, PBF and PBSF are highly efficient polymeric Nucleating Agents for PBS and its copolymers. In this work, strict isomorphism provides us a new method to find polymeric Nucleating Agent.
Zishou Zhang - One of the best experts on this subject based on the ideXlab platform.
-
crystallization behavior and melting characteristics of pp nucleated by a novel supported β Nucleating Agent
Polymer, 2008Co-Authors: Zishou Zhang, Zhugen Yang, Chunguang Wang, Chunyan Chen, Kancheng MaiAbstract:The β-nucleated PP with high β-PP content was prepared by a novel supported β-Nucleating Agent, which was prepared with pimelic acid supported on nano-CaCO3 as support. The influences of the content of the support and supported β-Nucleating Agent, pre-melting temperature (Tmelt) and scan rates on crystallization behavior and melting characteristics, and the β-PP content of β-nucleated PP were determined by Differential Scanning Calorimeter (DSC) and Wide-Angle X-ray Diffraction (WAXD). The results indicated that the addition of supported β-Nucleating Agent markedly increased the crystallization temperature (Tc) of PP. Increasing the content of supported β-Nucleating Agent slightly increased the Tc, but had no influence on the melting temperatures (Tm) of β-nucleated PP. The Tc and Tm of β-nucleated PP decreased slightly with increasing the content of the support nano-CaCO3. The effects of scan rates and multiple scans with different Tmelt on the crystallization and melting behavior of PP nucleated by supported β-Nucleating Agent are similar to that of PP nucleated by calcium pimelate (CaHA). The β-PP content above 90 percent was obtained in PP nucleated by supported β-Nucleating Agent and was not influenced by the content of nano-CaCO3. The supported β-Nucleating Agent prepared by supporting pimelic acid on nano-CaCO3 is a β-Nucleating Agent with high efficiency and selectivity, and low cost.
-
Preparation and characteristics of nano-CaCO3 supported β-Nucleating Agent of polypropylene
European Polymer Journal, 2008Co-Authors: Zishou Zhang, Youji Tao, Zhugen Yang, Kancheng MaiAbstract:In this paper, nano-CaCO3 supported β-Nucleating Agent for polypropylene (PP) was prepared by supporting pimelic acid on nano-CaCO3 with two methods. The thermal properties of pimelic acid and nano-CaCO3 supported β-Nucleating Agent were investigated by differential scanning calorimetry and thermogravimetry coupled with Fourier transform infrared spectrometry. The results indicated that the formation of β-Nucleating Agent supported on nano-CaCO3 was attributed to the chemical reaction between nano-CaCO3 and pimelic acid. The β-Nucleating Agent was added to PP to examine its β-Nucleating ability for PP, the polymorphism of the PP was characterized by wide-angle X-ray diffractometer. The results of investigation showed that the nano-CaCO3 supported β-Nucleating Agent exhibited higher nucleation ability and lower price compared to calcium pimelate β-Nucleating Agent.
Jin Liu - One of the best experts on this subject based on the ideXlab platform.
-
isomorphism in poly butylene succinate co butylene fumarate and its application as polymeric Nucleating Agent for poly butylene succinate
Macromolecules, 2012Co-Authors: Ruidong Wang, Jin Liu, Baohua GuoAbstract:Strict isomorphism between butylene succinate and butylene fumarate in poly(butylene succinate-co-butylene fumarate) (PBSF) was revealed by DSC and wide-angle X-ray diffraction results. They adopt the same crystal modification, with only a little difference in crystal lattice parameters. The melting point of the copolymer increases linearly with increasing molar ratio of butylene fumarate and the melting enthalpy hardly changes, which meet the requirement of strict isomorphism. The introduction of unsaturated comonomer, fumaric acid, into PBS can enhance the total crystallization rate and the radial growth rate of spherulites. Consequently, PBF and PBSF are highly efficient polymeric Nucleating Agents for PBS and its copolymers. In this work, strict isomorphism provides us a new method to find polymeric Nucleating Agent.
