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首页> 外文期刊>Macromolecules >Intergallery Living Polymerization Using Silicate-Anchored Photoiniferter.A Versatile Preparatory Method for Exfoliated Silicate Nanocomposites
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Intergallery Living Polymerization Using Silicate-Anchored Photoiniferter.A Versatile Preparatory Method for Exfoliated Silicate Nanocomposites

机译：使用硅酸盐锚定的光引发剂进行化合物间的活性聚合。一种用于剥离硅酸盐纳米复合材料的通用制备方法

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摘要

Living free radical polymerization of a variety of monomers using dithiocarbarmate photoiniferter modified silicate gave dispersed polymer/silicate nanocomposites,even for nanocomposites with very high silicate contents (7-63 wt %).Thus,nanocomposites containing polystyrene,poly(methyl methacrylate),poly(tert-butyl methacrylate),and poly(methyl methacrylate-b-styrene) of controlled molecular weight,architecture,and polydispersity were prepared.Dispersion and random orientation of the silicate layers in the polymer matrix were confirmed by both wide-angle X-ray diffraction and transmission (TEM) and scanning transmission electron microscopy (STEM).One principal finding is that exfoliated nanocomposites with very high silicate contents (above 20 wt %) could be used as nanoadditives or masterbatches to prepare all kinds of nanocomposites by simple blending without always having to begin from scratch.The exfoliation remained stable to subsequent thermal processing.The storage modulus of PMMA/silicate nanocomposite at only 3.2 wt % silicate loading was 30-40% higher than that of neat PMMA at all temperatures in the glassy region below the T_g of PMMA.The method is versatile,simple,and applicable to many monomers and requires no additional catalyst.
机译：使用二硫代氨基甲酸酯光引发剂改性的硅酸盐对各种单体进行活性自由基聚合，可得到分散的聚合物/硅酸盐纳米复合材料，甚至适用于硅酸盐含量很高（7-63 wt％）的纳米复合材料。制备了可控制的分子量，结构和多分散度的（甲基丙烯酸叔丁酯）和聚（甲基丙烯酸甲酯-b-苯乙烯）。通过广角X-射线法确定了硅酸酯层在聚合物基质中的分散性和无规取向射线衍射和透射（TEM）和扫描透射电子显微镜（STEM）。一个主要发现是，剥落的硅酸盐含量很高（大于20 wt％）的纳米复合材料可以用作纳米添加剂或母料，通过简单的共混即可制备各种纳米复合材料无需总是从头开始。剥落对随后的热处理保持稳定.PM的储能模量仅在3.2 wt％的硅酸盐含量下，MA /硅酸盐纳米复合材料在低于PMMA T_g的玻璃态区域的所有温度下均比纯PMMA高30-40％。该方法通用，简单，适用于许多单体，不需要额外的催化剂。

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