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首页> 外文期刊>New Journal of Chemistry >Synthesis of poly(epsilon-caprolactone)-silica nanocomposites: from hairy colloids to core-shell nanoparticles
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Synthesis of poly(epsilon-caprolactone)-silica nanocomposites: from hairy colloids to core-shell nanoparticles

机译：聚（ε-己内酯）-二氧化硅纳米复合材料的合成：从毛状胶体到核壳纳米粒子

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摘要

The synthesis of structurally well defined poly(epsilon-caprolactone) (PCL)-silica nanocomposites was performed following two synthetic routes:( 1) "graft from" anionic ring opening polymerization of CL initiated from the surface of silica nanoparticles that have been previously modified by grafting of hydroxyl groups,and (2) dispersion polymerization of CL in the presence of OH-functionalized silica beads.In both strategies,yttrium or aluminium alkoxides were used as catalysts.In the first case,the influence of the catalyst,the OH to Al molar ratio and the monomer concentration on the amount of grafted polymer was studied.TEM analysis revealed the formation of a dense and uniform polymer brush around the silica nanoparticles.In the second case,"core-shell" particles with a silica core and a PCL shell were successfully obtained.The grafting of a small quantity of polymer on the silica surface during the first stages of the dispersion polymerization process appeared to be a prerequisite condition for encapsulation to succeed.When raw,un-modified silica beads were used,encapsulation failed to occur.
机译：结构良好定义的聚（ε-己内酯）（PCL）-二氧化硅纳米复合材料的合成是通过以下两种合成途径进行的：（1）“从” CL的阴离子开环聚合反应“接枝”，该反应是由预先改性的二氧化硅纳米粒子的表面引发的通过羟基的接枝和（2）在OH-官能化的二氧化硅珠存在下CL的分散聚合。在两种策略中，均使用钇或烷氧基铝作为催化剂。在第一种情况下，催化剂的影响是OH与Al的摩尔比和单体浓度对接枝聚合物量的影响进行了研究。TEM分析表明，在二氧化硅纳米颗粒周围形成了致密且均匀的聚合物刷。在第二种情况下，具有二氧化硅核和成功地获得了PCL壳。在分散聚合过程的第一阶段中，将少量聚合物接枝到二氧化硅表面上似乎是先决条件成功的封装条件。当使用未改性的未改性二氧化硅微珠时，封装失败。

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