Synthesis and structure-property relationships of polypropylene-g-polystyrene and polypropylene-g-poly(n-butyl acrylate) graft copolymers with well-defined molecular structures
Synthesis and structure-property relationships of polypropylene-g-polystyrene and polypropylene-g-poly(n-butyl acrylate) graft copolymers with well-defined molecular structures
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分子结构明确的聚丙烯-g-聚苯乙烯和聚丙烯-g-聚丙烯酸正丁酯接枝共聚物的合成及其构效关系
DOI：
10.1016/j.polymer.2013.05.024
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发表时间：
2013-06
期刊：
影响因子：
4.6
通讯作者：
Tang Tao
中科院分区：
文献类型：
--
作者：
Wang Lu;Yang Hongfan;Tan Haiying;Yao Kun;Gong Jiang;Wan Dong;Qiu Jian;Tang Tao
基于相同的PP-BR前驱体，通过茂金属催化聚合和ATRP相结合，合成了具有明确分子结构的PP-g-PS(PP-g-PS)和PP-g-PnBA接枝共聚物。系统地研究了接枝共聚物的结构与性能之间的关系。随着支链长度的增加，PP-g-PS和PP-g-PnBA接枝共聚物的结晶温度先降低后升高。与PP-BR相比，PS或PnBA支化在PP主链上的引入均使η_0增大，剪切变稀行为更加明显，在低剪切频率下G‘值增大，损耗角减小。在相同发泡条件下，PP-g-PS和PP-g-PnBA泡沫塑料与PP-BR泡沫塑料相比，泡孔结构封闭，泡孔密度增大，泡孔尺寸分布均匀。PP-g-PS泡沫塑料的泡孔密度随支链长度的增加先增大后减小，泡孔尺寸随支链长度的增加而增大。然而，无论支链长度如何，三种PP-g-PnBA泡沫塑料的泡孔密度基本相同，且泡孔尺寸随支链长度的增加先减小后增大。
Several polypropylene-g-polystyrene (PP-g-PS) and polypropylene-g-poly(n-butyl acrylate) (PP-g-PnBA) graft copolymers with well-defined molecular structures, basing on the same PP-Br precursor, were synthesized via a combination of metallocene-catalyzed polymerization and ATRP. The structure–property relationships of the resultant graft copolymers were systematically investigated. The crystallization temperatures of the obtained PP-g-PS and PP-g-PnBA graft copolymers decreased first and increased then with the enhancement of branch lengths. Compared to PP-Br, the introduction of PS or PnBA branches onto PP backbones both led to increasedη0, more pronounced shear-thinning behavior, elevated value ofG′ at low shear frequencies, and reduced loss angle. Under the same foaming conditions, the resulting PP-g-PS and PP-g-PnBA foams exhibited closed cell structure, increased cell density, and uniformized cell size distribution compared to the PP-Br foam. The cell density of PP-g-PS foam increased first and decreased then with the enhancement of branch length, and the cell size increased as the branch length increased. However, the cell density of the obtained three PP-g-PnBA foams was almost the same regardless of the PnBA branch length, and the cell size decreased first and increased then with increasing the branch length.
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