Reactive Compatibilization of Poly(trimethylene terephthalate)/Polypropylene Blends by Polypropylene‐graft‐Maleic Anhydride. Part 1. Rheology, Morphology, Melting, and Mechanical Properties
Reactive Compatibilization of Poly(trimethylene terephthalate)/Polypropylene Blends by Polypropylene‐graft‐Maleic Anhydride. Part 1. Rheology, Morphology, Melting, and Mechanical Properties
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聚丙烯接枝马来酸酐对聚对苯二甲酸丙二醇酯/聚丙烯共混物的反应增容，第 1 部分：流变学、形态、熔融和机械性能。
DOI：
10.1080/00222340601158241
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
G. Qiu
中科院分区：
文献类型：
--
作者：
Meiling Xue;Yong;H. Chuah;G. Qiu
采用熔融共混法制备了聚对苯二甲酸丙二醇酯（PTT）/聚丙烯（PP）共混物。研究了聚丙烯接枝马来酸酐（PP-g-MAH）对PTT/PP共混物的流变性能、形态结构、熔融性能和力学性能的影响。熔体粘度的测定结果表明，PTT/PP共混物的流动行为与PTT相差很大，但与PP相似;在剪切应力作用下，分散的柔性PP相起到“滚珠效应”，使流体阻力显著降低;而相对刚性的PTT分散相对粘度的贡献较小。含5 wt.%在熔融加工过程中加入PP-g-MAH，70/30 PTT/PP共混物的剪切粘度和非牛顿指数均比相应的未增容的共混物有所增加，而30/70 PTT/PP熔体的剪切粘度略有下降，表明相当数量的PP-g-MAH不是作为增容剂，而是可能作为增塑剂。随着其他组分含量的增加，PTT相的熔融温度略有下降，PP相的熔融温度略有上升。5重量% PP‐g‐MAH的加入对两种组分的熔融温度影响不大。当PP≤20重量%时，PTT相的冷结晶温度（Tcc（PTT-相））显示出随组合物的变化很小;然而，当PP≥30重量%时，其向更高的温度移动。在有和没有PP-g-MAH的情况下，Tcc（PTT-phase）的变化表明，当PTT是次要组分时，不充当相容剂的过量PP-g-MAH可能充当增塑剂，使PTT的冷结晶过程变得更容易。扫描电镜结果表明，未增容的共混物，粒子脱出界面清晰光滑，而增容的共混物，反应产物位于界面处。力学性能表明，PP‐g‐MAH没有导致共混物的韧性的显着改善，但拉伸强度显着增加。
Poly(trimethylene terephthalate)/polypropylene (PTT/PP) blends were prepared by melt blending. The rheology, morphology, melting, and mechanical properties of PTT/PP blends were investigated with and without the addition of polypropylene‐graft‐maleic anhydride (PP‐g‐MAH). The melt viscosity results showed that the fluid behavior of PTT/PP blends exhibited great disparity to that of PTT but similar to that of PP; the dispersed flexible PP phase in the blends served as a “ball bearing effect” under shear stress, which made the fluid resistance markedly reduced; by contrast, the relatively rigid PTT dispersed phase made only a small contribution to the viscosity. With 5 wt.% PP‐g‐MAH addition during melt processing, both the shear viscosity and the non‐Newtonian index of 70/30 PTT/PP blend were increased over that of the corresponding uncompatibilized one, whereas the shear viscosity of the 30/70 PTT/PP melt decreased slightly indicating that a considerable amount of PP‐g‐MAH did not act as compatibilizer but probably served as plasticizer. With the increasing of the other component, the melting temperature of the PTT phase showed a slight decrease while the melting temperature of the PP phase showed a slight increase. 5 wt.% PP‐g‐MAH addition had little influence on the melting temperatures of the two components. When PP≤20 wt.%, the cold crystallization temperature of the PTT phase (Tcc (PTT‐phase)) showed little change with the composition; however, it shifted to higher temperature when PP≥30 wt.%. The variations of the Tcc (PTT‐phase), with and without PP‐g‐MAH, suggested that, when PTT was a minor component, the excess PP‐g‐MAH which did not act as compatibilizer might serve as a plasticizer that made the PTT's cold crystallization process to be easier. The SEM results indicated that, for the uncompatibilized blends, the interfaces from particles pulling‐out are clear and smooth, while, for compatibilized blends, the reactive products are at the interfaces. The mechanical properties suggested that PP‐g‐MAH did not result in significant improvement of the toughness of the blend, but the tensile strength increased markedly.