The Experts below are selected from a list of 150 Experts worldwide ranked by ideXlab platform

Klass De Groot - One of the best experts on this subject based on the ideXlab platform.

  • development of biomimetic nano hydroxyapatite poly Hexamethylene Adipamide composites
    Biomaterials, 2002
    Co-Authors: Xuejiang Wang, Jie Wei, Klass De Groot
    Abstract:

    In this study, acicular nano-hydroxyapatite (n-HA) was used to make a new biomimetic composite with polyamide (poly Hexamethylene Adipamide) by a unique technique. The physical and chemical characteristics of the composites were tested. It was found that these synthesized n-HA crystals were similar to bone apatite in size, phase composition and crystal structure. The biomimetic n-HA crystals were uniformly distributed in the polymer matrix and its content can reach 65%, close to that in natural bone. Chemical binding between inorganic n-HA and polyamide was investigated and discussed. The mechanical properties of the composites were found to match well with those of natural bone.

  • Development of biomimetic nano-hydroxyapatite/poly(Hexamethylene Adipamide) composites.
    Biomaterials, 2002
    Co-Authors: Xuejiang Wang, Jie Wei, Klass De Groot
    Abstract:

    In this study, acicular nano-hydroxyapatite (n-HA) was used to make a new biomimetic composite with polyamide (poly Hexamethylene Adipamide) by a unique technique. The physical and chemical characteristics of the composites were tested. It was found that these synthesized n-HA crystals were similar to bone apatite in size, phase composition and crystal structure. The biomimetic n-HA crystals were uniformly distributed in the polymer matrix and its content can reach 65%, close to that in natural bone. Chemical binding between inorganic n-HA and polyamide was investigated and discussed. The mechanical properties of the composites were found to match well with those of natural bone.

Benjamin S Hsiao - One of the best experts on this subject based on the ideXlab platform.

  • structure and crystallization behavior of nylon 66 multi walled carbon nanotube nanocomposites at low carbon nanotube contents
    Polymer, 2007
    Co-Authors: L Li, Christopher Y Li, Chaoying Ni, Lixia Rong, Benjamin S Hsiao
    Abstract:

    Abstract Multi-walled carbon nanotubes (MWNTs) were modified with poly(Hexamethylene Adipamide) (also known as Nylon 66) via a controlled polymer solution crystallization method. A “nanohybrid shish kebab” (NHSK) structure was found wherein the MWNT resembled the shish while Nylon 66 lamellar crystals formed the kebabs. These Nylon 66-functionalized MWNTs were used as precursors to prepare polymer/MWNT nanocomposites. Excellent dispersion was revealed by optical and electron microscopies. Nitric acid etching of the nanocomposites showed that MWNT formed a robust network in Nylon 66. Non-isothermal DSC results showed multiple melting peaks, which can be attributed to lamellar thickness changes upon heating. The crystallite sizes L100 and L010 of Nylon 66, determined by WAXD, decreased with increasing MWNT contents. Isothermal DSC results showed that crystallization kinetics increased first and then decreased with increasing MWNT contents in Nylon 66. This study showed that the effect of MWNTs on Nylon 66 crystallization is twofold: MWNTs provide heterogeneous nucleation sites for Nylon 66 crystallization while the tube network structure hinders large crystal growth.

  • Structure and crystallization behavior of Nylon 66/multi-walled carbon nanotube nanocomposites at low carbon nanotube contents
    Polymer, 2007
    Co-Authors: Lixia Rong, Benjamin S Hsiao
    Abstract:

    Abstract Multi-walled carbon nanotubes (MWNTs) were modified with poly(Hexamethylene Adipamide) (also known as Nylon 66) via a controlled polymer solution crystallization method. A “nanohybrid shish kebab” (NHSK) structure was found wherein the MWNT resembled the shish while Nylon 66 lamellar crystals formed the kebabs. These Nylon 66-functionalized MWNTs were used as precursors to prepare polymer/MWNT nanocomposites. Excellent dispersion was revealed by optical and electron microscopies. Nitric acid etching of the nanocomposites showed that MWNT formed a robust network in Nylon 66. Non-isothermal DSC results showed multiple melting peaks, which can be attributed to lamellar thickness changes upon heating. The crystallite sizes L100 and L010 of Nylon 66, determined by WAXD, decreased with increasing MWNT contents. Isothermal DSC results showed that crystallization kinetics increased first and then decreased with increasing MWNT contents in Nylon 66. This study showed that the effect of MWNTs on Nylon 66 crystallization is twofold: MWNTs provide heterogeneous nucleation sites for Nylon 66 crystallization while the tube network structure hinders large crystal growth.

Ling Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Controllable Crystallization Behavior of Nylon-6/66 Copolymers Based on Regulating Sequence Distribution
    Industrial & Engineering Chemistry Research, 2018
    Co-Authors: Jie Tang, Xun Pan, Ling Zhao
    Abstract:

    Based on retaining the excellent properties of nylon-6 (PA6), nylon-6/66 copolymers (PA6/66) with well-controlled dimensional stability and toughness exhibit more potential applications. In this work, PA6/66 random copolymers were synthesized by melt copolymerization of e-caprolactam and Hexamethylene Adipamide salt. The sequence distribution, crystal morphology, crystal forms, and melting and crystallization behavior of PA6/66 copolymers were systematically investigated by quantitative 13C NMR, polarized optical microscopy, wide-angle X-ray diffraction, and differential scanning calorimetry, respectively. The crystallization activation energy increases from −286.43 to −212.43 kJ mol–1 as the co-polyamide bond ratio increases from 0 to 0.22, while the deteriorating sequence regularity does not alter the original crystal morphology and crystal forms of PA6. Significantly, control over the crystallization behavior of PA6/66 copolymer has been obtained through finely regulating its sequence distribution. Thi...

  • Controllable Crystallization Behavior of Nylon-6/66 Copolymers Based on Regulating Sequence Distribution
    2018
    Co-Authors: Jie Tang, Xun Pan, Ling Zhao
    Abstract:

    Based on retaining the excellent properties of nylon-6 (PA6), nylon-6/66 copolymers (PA6/66) with well-controlled dimensional stability and toughness exhibit more potential applications. In this work, PA6/66 random copolymers were synthesized by melt copolymerization of ε-capro­lactam and Hexamethylene Adipamide salt. The sequence distribution, crystal morphology, crystal forms, and melting and crystallization behavior of PA6/66 copolymers were systematically investigated by quantitative 13C NMR, polarized optical microscopy, wide-angle X-ray diffraction, and differential scanning calorimetry, respectively. The crystallization activation energy increases from −286.43 to −212.43 kJ mol–1 as the co-polyamide bond ratio increases from 0 to 0.22, while the deteriorating sequence regularity does not alter the original crystal morphology and crystal forms of PA6. Significantly, control over the crystallization behavior of PA6/66 copolymer has been obtained through finely regulating its sequence distribution. This work could provide theoretical support and new insights for controllable preparation of PA6 copolymers and ultimately be beneficial to extend their applications

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

  • development of biomimetic nano hydroxyapatite poly Hexamethylene Adipamide composites
    Biomaterials, 2002
    Co-Authors: Xuejiang Wang, Jie Wei, Klass De Groot
    Abstract:

    In this study, acicular nano-hydroxyapatite (n-HA) was used to make a new biomimetic composite with polyamide (poly Hexamethylene Adipamide) by a unique technique. The physical and chemical characteristics of the composites were tested. It was found that these synthesized n-HA crystals were similar to bone apatite in size, phase composition and crystal structure. The biomimetic n-HA crystals were uniformly distributed in the polymer matrix and its content can reach 65%, close to that in natural bone. Chemical binding between inorganic n-HA and polyamide was investigated and discussed. The mechanical properties of the composites were found to match well with those of natural bone.

  • Development of biomimetic nano-hydroxyapatite/poly(Hexamethylene Adipamide) composites.
    Biomaterials, 2002
    Co-Authors: Xuejiang Wang, Jie Wei, Klass De Groot
    Abstract:

    In this study, acicular nano-hydroxyapatite (n-HA) was used to make a new biomimetic composite with polyamide (poly Hexamethylene Adipamide) by a unique technique. The physical and chemical characteristics of the composites were tested. It was found that these synthesized n-HA crystals were similar to bone apatite in size, phase composition and crystal structure. The biomimetic n-HA crystals were uniformly distributed in the polymer matrix and its content can reach 65%, close to that in natural bone. Chemical binding between inorganic n-HA and polyamide was investigated and discussed. The mechanical properties of the composites were found to match well with those of natural bone.

Jie Tang - One of the best experts on this subject based on the ideXlab platform.

  • Controllable Crystallization Behavior of Nylon-6/66 Copolymers Based on Regulating Sequence Distribution
    Industrial & Engineering Chemistry Research, 2018
    Co-Authors: Jie Tang, Xun Pan, Ling Zhao
    Abstract:

    Based on retaining the excellent properties of nylon-6 (PA6), nylon-6/66 copolymers (PA6/66) with well-controlled dimensional stability and toughness exhibit more potential applications. In this work, PA6/66 random copolymers were synthesized by melt copolymerization of e-caprolactam and Hexamethylene Adipamide salt. The sequence distribution, crystal morphology, crystal forms, and melting and crystallization behavior of PA6/66 copolymers were systematically investigated by quantitative 13C NMR, polarized optical microscopy, wide-angle X-ray diffraction, and differential scanning calorimetry, respectively. The crystallization activation energy increases from −286.43 to −212.43 kJ mol–1 as the co-polyamide bond ratio increases from 0 to 0.22, while the deteriorating sequence regularity does not alter the original crystal morphology and crystal forms of PA6. Significantly, control over the crystallization behavior of PA6/66 copolymer has been obtained through finely regulating its sequence distribution. Thi...

  • Controllable Crystallization Behavior of Nylon-6/66 Copolymers Based on Regulating Sequence Distribution
    2018
    Co-Authors: Jie Tang, Xun Pan, Ling Zhao
    Abstract:

    Based on retaining the excellent properties of nylon-6 (PA6), nylon-6/66 copolymers (PA6/66) with well-controlled dimensional stability and toughness exhibit more potential applications. In this work, PA6/66 random copolymers were synthesized by melt copolymerization of ε-capro­lactam and Hexamethylene Adipamide salt. The sequence distribution, crystal morphology, crystal forms, and melting and crystallization behavior of PA6/66 copolymers were systematically investigated by quantitative 13C NMR, polarized optical microscopy, wide-angle X-ray diffraction, and differential scanning calorimetry, respectively. The crystallization activation energy increases from −286.43 to −212.43 kJ mol–1 as the co-polyamide bond ratio increases from 0 to 0.22, while the deteriorating sequence regularity does not alter the original crystal morphology and crystal forms of PA6. Significantly, control over the crystallization behavior of PA6/66 copolymer has been obtained through finely regulating its sequence distribution. This work could provide theoretical support and new insights for controllable preparation of PA6 copolymers and ultimately be beneficial to extend their applications