端羧基液体丁腈橡胶改性双组分室温固化环氧结构胶的制备与性能
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Preparation and Properties of Carboxyl-Terminated Polybutadiene Acrylonitrile Modified Epoxy Resin Under Room Temperature Curing Condition
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    摘要:

    将端羧基液体丁腈橡胶(CTBN)与环氧树脂(EP)预聚,采用红外光谱、黏度计、万能电子材料试验机及扫描电镜(SEM)研究了CTBN含量对EP/聚酰胺/聚醚胺室温固化环氧结构胶的性能影响。结果表明,CTBN 用量从0phr增加至20phr时,胶体拉伸强度从45MPa降低至29MPa,降低了35.56%;压缩强度从98MPa降低至60.2MPa,降低了38.6%;当CTBN加到10phr时,极大地提升了粘接强度,钢-钢剪切强度从4.1MPa上升到16.7MPa,增加了3.07倍;结构胶加热至400℃时,EP质量损失达73.7%,而CTBN改性EP的质量损失为59.4%。SEM 结果表明,CTBN在胶体固化过程中析出橡胶相,还有一定的空穴出现,橡胶粒子通过空化以及界面脱粘释放其弹性能,使材料的韧性得以提高。

    Abstract:

    Pre-polymerization was synthesized by reaction of liquid carboxyl-terminated polybutadiene acrylonitrile (CTBN) and epoxy resin. The effect of liquid CTBN content on epoxy resin/polyamide/amino-teminated polyoxypropylene room temperature curing adhesive was investigated by IR, viscometer, universal material tester and scanning electron microscopy (SEM). The results indicate that when the addition of CTBN changes from 0phr to 20phr, the tensile strength and compressive strength decrease from 45MPa to 29MPa and 98MPa to 60.2MPa, respectively. Bonding strength and thermal stability is improved with the introduction of CTBN into epoxy network. When the addition of CTNB is 10 phr, shear strength of joints increases from 4.1MPa to 16.7MPa. Incorporation of CTBN into epoxy resin improves thermal stability and thermal degradation temperature. Mass loss of unmodified EP and modified EP with 20 phr CTBN at 400 ℃ is 73.7% and 59.4%, respectively. Microstructures of the fracture surfaces examined by SEM indicate that CTBN appears as spherical particles and disperses well in epoxy matrix. In addition, the significance of particle cavitation in rubber-toughened polymers promotes the shear yielding.

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俞寅辉, 乔敏, 高楠箫, 冉千平, 刘加平.端羧基液体丁腈橡胶改性双组分室温固化环氧结构胶的制备与性能[J].高分子材料科学与工程,2013,29(11):146-148.

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