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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis of poly(ε-caprolactone)/clay nanocomposites using polyhedral oligomeric silsesquioxane surfactants as organic modifier and initiator
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Synthesis of poly(ε-caprolactone)/clay nanocomposites using polyhedral oligomeric silsesquioxane surfactants as organic modifier and initiator

机译：以多面体低聚倍半硅氧烷表面活性剂为有机改性剂和引发剂合成聚（ε-己内酯）/粘土纳米复合材料

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摘要

Poly(ε-caprolactone)/clay nanocomposites were synthesized by in situ ring-opening polymerization of ε-caprolactone in the presence of montmorillonite modified by hydroxyl functionalized, quaternized polyhedral oligomeric silsesquioxane (POSS) surfactants. The octa(3-chloropropyl) polyhedral oligomeric silsesquioxane was prepared by hydrolytic condensation of 3-chloropropyltrimethoxysilane, which was subsequently quaternized with 2-dimethylaminoethanol. Montmorillonite was modified with the quaternized surfactants by cation exchange reaction. Bulk polymerization of ε-caprolactone was conducted at 110°C using stannous octoate as an initiator/catalyst. Nanocomposites were analyzed by X-ray diffraction, transmission electron microscopy, thermo gravimetric analysis, and differential scanning calorimetry. Hydroxyl functionalized POSS was employed as a surface modifier for clay which gives stable clay separation for its 3-D structure and also facilitates the miscibility of polymer with clay in the nanocomposites due to the star architecture. An improvement in the thermal stability of PCL was observed even at 1 wt % of clay loading.
机译：聚（ε-己内酯）/粘土纳米复合材料是在蒙脱土存在下，通过羟基官能化，季铵化的多面体低聚倍半硅氧烷（POSS）表面活性剂改性的ε-己内酯的开环聚合反应而合成的。通过3-氯丙基三甲氧基硅烷的水解缩合反应制备八（3-氯丙基）多面体低聚倍半硅氧烷，随后将其与2-二甲基氨基乙醇季铵化。通过季铵化表面活性剂通过阳离子交换反应对蒙脱石进行改性。 ε-己内酯的本体聚合是在110℃下使用辛酸亚锡作为引发剂/催化剂进行的。通过X射线衍射，透射电子显微镜，热重分析和差示扫描量热法分析纳米复合材料。羟基官能化的POSS用作粘土的表面改性剂，由于其星形结构，可使其3-D结构获得稳定的粘土分离，并且还有助于聚合物与粘土在纳米复合材料中的混溶性。即使在粘土含量为1重量％时，也观察到PCL的热稳定性有所改善。

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