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首页> 外文期刊>Journal of Applied Polymer Science >Effects of the Addition of a Graft Copolymer of Propylene with Styrene on Thermal Behavior, Crystallization, and Morphology of Isotactic Polypropylene
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Effects of the Addition of a Graft Copolymer of Propylene with Styrene on Thermal Behavior, Crystallization, and Morphology of Isotactic Polypropylene

机译：丙烯与苯乙烯接枝共聚物的加入对全同立构聚丙烯的热行为，结晶和形态的影响

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摘要

A novel graft copolymer of unsaturated propylene with styrene (uPP-g-Ps) was added to isotactic polypropylene(iPP) to investigate the state of mixing between uPP-g-PS and iPP phase and effects of the uPP-g-PS addition on iPP intrinsic phase structure,i.e., on iPP spherulitic texture and inner structure of the spherulites fibrillae. Thin films of iPP/uPP-g-PS blends containing 2,5, and 10% (wt/wt) of graft copolymer were prepared by o-dichlorobenzene casting, according to the method we used previously to obtain samplex of iPP/atactic polystyrene/uPP-g-PS ternary blends(D'Orazio et al. J Appl Polym Sci 1997, 65, 1539; D'Orazio et al. J Appl Polym Sci, 1999, 72, 1429). The variation of the δwith temperature and differential scanning calorimetry thermograms showed respectively that, regardless of blend composition, a single glass transition temperature and a single apparent melting temperature were foound for the iPP phase in the iPP/uPP-g-PS binary systems. Optical microscopy investigation revealed that, with increasing uPP-g-PS content, iPP spherulites become more open and coarse. On the other hand, both dimension and number per unit area of the amorphous interspherulitic contact regions decreased. The long period values of the iPP phase, calculated from the peak position of Lorentz-corrected desmeared small angel X-ray scattering profiles, increased markedly with increasing uPP-g-PS content; such an increase was due to an increase of both average crystalline lamellar thickness and interlamellar amorphous phase.
机译：将一种新型的不饱和丙烯与苯乙烯的接枝共聚物（uPP-g-Ps）添加到全同立构聚丙烯（iPP）中，以研究uPP-g-PS和iPP相之间的混合状态以及uPP-g-PS添加对聚丙烯的影响。 iPP的固有相结构，即关于iPP的球状结构和原纤维的内部结构。通过邻二氯苯流延法制备包含2,5和10％（wt / wt）接枝共聚物的iPP / uPP-g-PS共混物的薄膜，根据我们先前用于获得iPP /无规聚苯乙烯样品的方法制备/ uPP-g-PS三元共混物（D'Orazio等人，J Appl Polym Sci 1997，65，1539; D'Orazio等人，J Appl Polym Sci，1999，72，1429）。 δ随温度的变化和差示扫描量热法热分析图分别表明，不管共混物的组成如何，在iPP / uPP-g-PS二元体系中，iPP相均具有单一的玻璃化转变温度和单一的表观熔融温度。光学显微镜研究显示，随着uPP-g-PS含量的增加，iPP球晶变得更加开放和粗糙。另一方面，无定形的球间接触区域的尺寸和每单位面积的数量均减小。从洛伦兹校正的去污小天使X射线散射曲线的峰值位置计算得出的iPP相的长期值随uPP-g-PS含量的增加而显着增加。这种增加是由于平均结晶层厚度和层间无定形相的增加。

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