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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Synthesis and polymerization kinetics of polystyrene grafting using azo-groups bounded SiO _2 as an initiator
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Synthesis and polymerization kinetics of polystyrene grafting using azo-groups bounded SiO _2 as an initiator

机译：以偶氮基团结合的SiO _2为引发剂的聚苯乙烯接枝合成及聚合动力学

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摘要

This work presents a new method for synthesis of inorganic/organic hybrid nanoparticles via the in-situ polymerization by the use of the azo-groups bounded silica nanoparticles as a radical initiator and styrene as a model vinyl-monomer. The synthesis and the structure of silica/polystyrene (SiO _2/PS), and the polymerization kinetics of the styrene initiated by the azo-groups bounded SiO _2 nanoparticles are studied with techniques such as FTIR, XPS, DSC, GPC, and TEM. Results show that the SiO _2-g-PS nanoparticles are synthesized successfully, and the resulting hybrid nanoparticles have a core-shell structure with SiO _2 in the core and the polystyrene on the outside layer. The percentage of the grafted PS on the SiO _2 surface increases with the progress of the polymerization before 6 h, and the largest amount of the grafted PS reaches 33% of the silica nanoparticles. Consequently, the size of the nanoparticles increases ca. 20 nm upon the polystyrene grafting. The molecular weight of the grafted PS increases with the polymerization, and it has reached a much large value in the first several polymerization hours while it keeps a constant value approximately in the following polymerization process. Meanwhile, the polydispersity index of the grafted PS gradually increases with the progress of the polymerization. These phenomena agree with the theory of the traditional free radical polymerization very well.
机译：这项工作提出了一种新方法，通过使用偶氮基键合的二氧化硅纳米粒子作为自由基引发剂和苯乙烯作为模型乙烯基单体，通过原位聚合合成无机/有机杂化纳米粒子。利用FTIR，XPS，DSC，GPC和TEM等技术研究了二氧化硅/聚苯乙烯（SiO _2 / PS）的合成，结构以及偶氮基团结合的SiO _2纳米粒子引发的苯乙烯的聚合动力学。结果表明，成功合成了SiO _2-g-PS纳米颗粒，所得杂化纳米颗粒具有核壳结构，其芯为SiO _2，外层为聚苯乙烯。 SiO_2表面上接枝PS的百分数随着6h之前聚合的进行而增加，最多的接枝PS达到了二氧化硅纳米粒子的33％。因此，纳米颗粒的尺寸增加了约。聚苯乙烯接枝后20 nm。接枝的PS的分子量随聚合反应而增加，并且在最初的几个聚合小时内已达到很大的值，而在随后的聚合过程中大约保持恒定值。同时，接枝的PS的多分散指数随着聚合的进行逐渐增加。这些现象非常符合传统自由基聚合的理论。

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