The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Siddharth S. Ray - One of the best experts on this subject based on the ideXlab platform.

  • covalently grafted graphene oxide poly cn acrylate nanocomposites by surface initiated atrp an efficient antifriction antiwear and pour point depressant lubricating additive in oil media
    Industrial & Engineering Chemistry Research, 2016
    Co-Authors: Arvind Kumar, Babita Behera, Gananath D. Thakre, Siddharth S. Ray
    Abstract:

    Nanocomposites of graphene oxide with polyacrylates with varying numbers of carbon atoms from 10 to 18 were prepared by surface-initiated atom-transfer radical polymerization (SI-ATRP), thereby controlling the density of polymer grafting through regulated molecular weight with narrow polydispersity. The dispersivities of these nanocomposites in oil media depend on the grafted density of polyacrylates on the graphene surface, and the degree of dispersion and stability increase with increasing chain length. After detailed characterization of these nanocomposites, their lubrication properties in terms of antifriction and antiwear behavior in base oil and polyol were evaluated. An optimized loading of 0.04 mg/mL graphene oxide/C18-polyacryalate nanocomposite in base oil and polyol provided improved tribological properties in terms of significant reductions of about 42% and 34% in friction and wear, respectively, as well as an improvement in the pour point, thus qualifying this nanocomposite as a potential ant...

  • Covalently Grafted Graphene Oxide/Poly(Cn‑acrylate) Nanocomposites by Surface-Initiated ATRP: An Efficient Antifriction, Antiwear, and Pour-Point-Depressant Lubricating Additive in Oil Media
    2016
    Co-Authors: Arvind Kumar, Babita Behera, Gananath D. Thakre, Siddharth S. Ray
    Abstract:

    Nanocomposites of graphene oxide with polyacrylates with varying numbers of carbon atoms from 10 to 18 were prepared by surface-initiated atom-transfer radical polymerization (SI-ATRP), thereby controlling the density of polymer grafting through regulated molecular weight with narrow polydispersity. The dispersivities of these nanocomposites in oil media depend on the grafted density of polyacrylates on the graphene surface, and the degree of dispersion and stability increase with increasing chain length. After detailed characterization of these nanocomposites, their lubrication properties in terms of antifriction and antiwear behavior in base oil and polyol were evaluated. An optimized loading of 0.04 mg/mL graphene oxide/C18-polyacryalate nanocomposite in base oil and polyol provided improved tribological properties in terms of significant reductions of about 42% and 34% in friction and wear, respectively, as well as an improvement in the pour point, thus qualifying this nanocomposite as a potential antifriction, antiwear, and pour-point-depressant additive for lubricating oils and polyol

Ding-chang Wang - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis of polyarylate through interfacial polycondensation by use of glycolyzed products of poly(ethylene terephthalate) glycolysis with bisphenol-a
    Journal of Polymer Research, 1997
    Co-Authors: Ding-chang Wang, Chung-yu Wang, Wen-yen Chiu, Leo-wang Chen
    Abstract:

    The glycolysis of poly (ethylene-terephthalate) with bisphenol-A at certain ratios of PET/BPA was carried out in an autoclave reactor at different temperatures for varying periods of time. Then the glycolyzed products were utilized together with bisphenol-A for the synthesis of Polyarylates through interfacial polycondensation. The Polyarylates obtained (referred to as b/g-Polyarylates in this article) possess good thermal characteristics but have lower mechanical strength than typical polyarylate synthesized from pure bisphenol-A by use of the same method. Blending the b/g-polyarylate with polycarbonate improved the impact strength significantly. As a whole, glycolysis with bisphenol-A followed by synthesis of polyarylate through interfacial polycondensation provided a feasible route for the reuse of poly(ethylene terephthalate).

  • Synthesis of flexible polyarylate by interfacial polycondensation
    Journal of Polymer Research, 1994
    Co-Authors: Ding-chang Wang, Wen-yen Chiu
    Abstract:

    Products with hydroxyl ends were synthesized from the esterification of bisphenol-A, terephthalic acid and ethylene glycol. These ester products were then used for synthesis of polyarylate by interfacial polycondensation. Not only the relative concentrations of reactants for esterification but also the conditions for interfacial polycondensation, such as the monomer ratio between two phases and the reaction time, play significant roles in affecting the properties of final products. Under proper synthesis conditions, the polyarylate formed could possess equivalent thermal characteristics and much higher impact strength in comparison with unmodified polyarylate due to the incorporation of flexible aliphatic segments from ethylene glycol. X-ray diffraction showed the existence of aliphatic segments would induce small degree of orderly alignment locally in structure.

Arvind Kumar - One of the best experts on this subject based on the ideXlab platform.

  • covalently grafted graphene oxide poly cn acrylate nanocomposites by surface initiated atrp an efficient antifriction antiwear and pour point depressant lubricating additive in oil media
    Industrial & Engineering Chemistry Research, 2016
    Co-Authors: Arvind Kumar, Babita Behera, Gananath D. Thakre, Siddharth S. Ray
    Abstract:

    Nanocomposites of graphene oxide with polyacrylates with varying numbers of carbon atoms from 10 to 18 were prepared by surface-initiated atom-transfer radical polymerization (SI-ATRP), thereby controlling the density of polymer grafting through regulated molecular weight with narrow polydispersity. The dispersivities of these nanocomposites in oil media depend on the grafted density of polyacrylates on the graphene surface, and the degree of dispersion and stability increase with increasing chain length. After detailed characterization of these nanocomposites, their lubrication properties in terms of antifriction and antiwear behavior in base oil and polyol were evaluated. An optimized loading of 0.04 mg/mL graphene oxide/C18-polyacryalate nanocomposite in base oil and polyol provided improved tribological properties in terms of significant reductions of about 42% and 34% in friction and wear, respectively, as well as an improvement in the pour point, thus qualifying this nanocomposite as a potential ant...

  • Covalently Grafted Graphene Oxide/Poly(Cn‑acrylate) Nanocomposites by Surface-Initiated ATRP: An Efficient Antifriction, Antiwear, and Pour-Point-Depressant Lubricating Additive in Oil Media
    2016
    Co-Authors: Arvind Kumar, Babita Behera, Gananath D. Thakre, Siddharth S. Ray
    Abstract:

    Nanocomposites of graphene oxide with polyacrylates with varying numbers of carbon atoms from 10 to 18 were prepared by surface-initiated atom-transfer radical polymerization (SI-ATRP), thereby controlling the density of polymer grafting through regulated molecular weight with narrow polydispersity. The dispersivities of these nanocomposites in oil media depend on the grafted density of polyacrylates on the graphene surface, and the degree of dispersion and stability increase with increasing chain length. After detailed characterization of these nanocomposites, their lubrication properties in terms of antifriction and antiwear behavior in base oil and polyol were evaluated. An optimized loading of 0.04 mg/mL graphene oxide/C18-polyacryalate nanocomposite in base oil and polyol provided improved tribological properties in terms of significant reductions of about 42% and 34% in friction and wear, respectively, as well as an improvement in the pour point, thus qualifying this nanocomposite as a potential antifriction, antiwear, and pour-point-depressant additive for lubricating oils and polyol

Wen-yen Chiu - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis of polyarylate through interfacial polycondensation by use of glycolyzed products of poly(ethylene terephthalate) glycolysis with bisphenol-a
    Journal of Polymer Research, 1997
    Co-Authors: Ding-chang Wang, Chung-yu Wang, Wen-yen Chiu, Leo-wang Chen
    Abstract:

    The glycolysis of poly (ethylene-terephthalate) with bisphenol-A at certain ratios of PET/BPA was carried out in an autoclave reactor at different temperatures for varying periods of time. Then the glycolyzed products were utilized together with bisphenol-A for the synthesis of Polyarylates through interfacial polycondensation. The Polyarylates obtained (referred to as b/g-Polyarylates in this article) possess good thermal characteristics but have lower mechanical strength than typical polyarylate synthesized from pure bisphenol-A by use of the same method. Blending the b/g-polyarylate with polycarbonate improved the impact strength significantly. As a whole, glycolysis with bisphenol-A followed by synthesis of polyarylate through interfacial polycondensation provided a feasible route for the reuse of poly(ethylene terephthalate).

  • Synthesis of flexible polyarylate by interfacial polycondensation
    Journal of Polymer Research, 1994
    Co-Authors: Ding-chang Wang, Wen-yen Chiu
    Abstract:

    Products with hydroxyl ends were synthesized from the esterification of bisphenol-A, terephthalic acid and ethylene glycol. These ester products were then used for synthesis of polyarylate by interfacial polycondensation. Not only the relative concentrations of reactants for esterification but also the conditions for interfacial polycondensation, such as the monomer ratio between two phases and the reaction time, play significant roles in affecting the properties of final products. Under proper synthesis conditions, the polyarylate formed could possess equivalent thermal characteristics and much higher impact strength in comparison with unmodified polyarylate due to the incorporation of flexible aliphatic segments from ethylene glycol. X-ray diffraction showed the existence of aliphatic segments would induce small degree of orderly alignment locally in structure.

Leo-wang Chen - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis of polyarylate through interfacial polycondensation by use of glycolyzed products of poly(ethylene terephthalate) glycolysis with bisphenol-a
    Journal of Polymer Research, 1997
    Co-Authors: Ding-chang Wang, Chung-yu Wang, Wen-yen Chiu, Leo-wang Chen
    Abstract:

    The glycolysis of poly (ethylene-terephthalate) with bisphenol-A at certain ratios of PET/BPA was carried out in an autoclave reactor at different temperatures for varying periods of time. Then the glycolyzed products were utilized together with bisphenol-A for the synthesis of Polyarylates through interfacial polycondensation. The Polyarylates obtained (referred to as b/g-Polyarylates in this article) possess good thermal characteristics but have lower mechanical strength than typical polyarylate synthesized from pure bisphenol-A by use of the same method. Blending the b/g-polyarylate with polycarbonate improved the impact strength significantly. As a whole, glycolysis with bisphenol-A followed by synthesis of polyarylate through interfacial polycondensation provided a feasible route for the reuse of poly(ethylene terephthalate).