Synthesis and barrier properties of poly(ε‐caprolactone)‐layered silicate nanocomposites
Synthesis and barrier properties of poly(ε‐caprolactone)‐layered silicate nanocomposites
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DOI：
10.1002/pola.1995.080330707
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发表时间：
1995-05
期刊：
影响因子：
--
通讯作者：
P. Messersmith;E. Giannelis
中科院分区：
文献类型：
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作者：
P. Messersmith;E. Giannelis
合成了一种新的聚合物-陶瓷纳米复合材料，该复合材料由分散良好的二维有机改性云母型硅酸盐（MTS）层组成，该层位于可降解的聚e-己内酯基质中。MTS的质子化氨基酸衍生物用于促进宿主层的分层/分散，并引发e-己内酯单体的开环聚合，从而产生与硅酸盐层离子结合的聚（e-己内酯）链。聚合物链可以通过反向离子交换反应从硅酸盐表面释放出来，并且在光谱上与纯聚e-己内酯相似。聚合物纳米复合材料的厚膜表现出水蒸气渗透率的显著降低，水蒸气渗透率与硅酸盐含量呈线性关系。与纯聚e-己内酯相比，硅含量低至4.8%的纳米复合材料的渗透率降低了近一个数量级。
A new polymer-ceramic nanocomposite has been synthesized consisting of well-dispersed, two-dimensional layers of an organically modified mica-type silicate (MTS) within a degradable poly(e-caprolactone) matrix. A protonated amino acid derivative of MTS was used to promote delamination/dispersion of the host layers and initiate ring-opening polymerization of e-caprolactone monomer, resulting in poly(e-caprolactone) chains that are ionically bound to the silicate layers. The polymer chains can be released from the silicate surface by a reverse ion-exchange reaction and were shown to be spectroscopically similar to pure poly(e-caprolactone). Thick films of the polymer nanocomposite exhibit a significant reduction in water vapor permeability that shows a linear dependence on silicate content. The permeability of nanocomposite containing as low as 4.8% silicate by volume was reduced by nearly an order of magnitude compared to pure poly(e-caprolactone)