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Dependence of epoxy toughness on the backbone structure of hyperbranched polyether modifiers

机译：环氧韧性对超支化聚醚改性剂骨干结构的依赖性

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摘要

The synthesis of epoxide-terminated hyperbranched polyethers (EHBPEs) with different backbone stiffness and molecular weight (MW) is obtained using simple one-pot A(2) + B-3 approach. When used as tougheners for DGEBA/TETA system, non-phase-separated cured networks are always obtained. Effects of MW and backbone stiffness on the toughening performance were systematically investigated. Among the EHBPEs studied, EHBPE-4C which has the lowest MW and stiffest backbone and EHBPE-10C which has the highest MW and most flexible backbone can simultaneously improve toughness, tensile strength, and T-g. In contrast, addition of EHBPE-6C and EHBPE-8C, which have medium MW and backbone stiffness, lead to incomplete cure and cannot improve or worsen the toughness and tensile strength. Both stiffness and MW of hyperbranched polyether play important roles in determining the crosslink density and structure of non-phase-separated networks, which dictate the toughness, strength and T-g of toughened epoxy.
机译：使用简单的单壶A（2）+ B-3方法，获得具有不同骨架刚度和分子量（MW）的环氧封端的超支化聚醚（EHBPES）的合成。当用作DGEBA / TETA系统的增韧剂时，总是获得非相位分离的固化网络。系统研究了MW和骨干刚度对增韧性能的影响。在研究的EHBPES中，具有最低MW和最硬质骨架和EHBPE-10C的EHBPE-4C可以同时提高韧性，拉伸强度和T-G可以同时提高韧性，拉伸强度和T-G。相反，添加EHBPE-6C和EHBPE-8C，具有中MW和骨架刚度，导致固化不完全，不能改善或恶化韧性和拉伸强度。超支化聚醚的刚度和MW在确定非相分离网络的交联密度和结构时起着重要作用，这决定了强化环氧树脂的韧性，强度和T-G。

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  • 来源
    《RSC Advances》 |2015年第5期|共9页
  • 作者

    Liu Tuan; Nie Yongxing; Zhang Liangdong; Chen Ruoshi; Meng Yan; Li Xiaoyu;

  • 作者单位

    Beijing Univ Chem Technol Key Lab Carbon Fiber &

    Funct Polymers Minist Educ Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol State Key Lab Organ Inorgan Composites Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol State Key Lab Organ Inorgan Composites Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol Key Lab Carbon Fiber &

    Funct Polymers Minist Educ Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol Key Lab Carbon Fiber &

    Funct Polymers Minist Educ Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol State Key Lab Organ Inorgan Composites Beijing 100029 Peoples R China;

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