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首页> 美国卫生研究院文献>Materials >Mechanical Properties and Morphologies of Carboxyl-Terminated Butadiene Acrylonitrile Liquid Rubber/Epoxy Blends Compatibilized by Pre-Crosslinking
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Mechanical Properties and Morphologies of Carboxyl-Terminated Butadiene Acrylonitrile Liquid Rubber/Epoxy Blends Compatibilized by Pre-Crosslinking

机译：预交联相容的羧基封端的丁二烯丙烯腈液体橡胶/环氧共混物的力学性能和形貌

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In order to enhance the compatibilization and interfacial adhesion between epoxy and liquid carboxyl-terminated butadiene acrylonitrile (CTBN) rubber, an initiator was introduced into the mixture and heated to initiate the cross-linking reaction of CTBN. After the addition of curing agents, the CTBN/epoxy blends with a localized interpenetrating network structure were prepared. The mechanical properties and morphologies of pre-crosslinked and non-crosslinked CTBN/epoxy blends were investigated. The results show that the tensile strength, elongation at break and impact strength of pre-crosslinked CTBN/epoxy blends are significantly higher than those of non-crosslinked CTBN/epoxy blends, which is primarily due to the enhanced interfacial strength caused by the chemical bond between the two phases and the localized interpenetrating network structure. Both pre-crosslinked and non-crosslinked CTBN/epoxy blends show a bimodal distribution of micron- and nano-sized rubber particles. However, pre-crosslinked CTBN/epoxy blends have smaller micron-sized rubber particles and larger nano-sized rubber particles than non-crosslinked CTBN/epoxy blends. The dynamic mechanical analysis shows that the storage modulus of pre-crosslinked CTBN/epoxy blends is higher than that of non-crosslinked CTBN/epoxy blends. The glass transition temperature of the CTBN phase in pre-crosslinked CTBN/epoxy blends increases slightly compared with the CTBN/epoxy system. The pre-crosslinking of rubber is a promising method for compatibilization and controlling the morphology of rubber-modified epoxy materials.
机译：为了增强环氧树脂和液体羧基封端的丁二烯丙烯腈（CTBN）橡胶之间的相容性和界面粘合性，将引发剂引入混合物中并加热以引发CTBN的交联反应。在添加固化剂之后，制备具有局部互穿网络结构的CTBN /环氧共混物。研究了预交联和非交联的CTBN /环氧树脂共混物的力学性能和形貌。结果表明，预交联的CTBN /环氧树脂共混物的拉伸强度，断裂伸长率和冲击强度显着高于非交联的CTBN /环氧树脂共混物，这主要是由于化学键引起的界面强度提高。两个阶段之间的联系以及本地化的互穿网络结构。预交联和未交联的CTBN /环氧共混物均显示出微米级和纳米级橡胶颗粒的双峰分布。然而，与未交联的CTBN /环氧树脂共混物相比，预交联的CTBN /环氧树脂共混物具有更小的微米级橡胶颗粒和更大的纳米级橡胶颗粒。动态力学分析表明，预交联的CTBN /环氧树脂共混物的储能模量高于非交联的CTBN /环氧树脂共混物的储能模量。与CTBN /环氧树脂体系相比，预交联的CTBN /环氧树脂混合物中CTBN相的玻璃化转变温度略有提高。橡胶的预交联是一种有前途的增容和控制橡胶改性环氧材料形态的方法。

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