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首页> 外文期刊>Colloid and polymer science >Time-resolved micro-indentation hardness measurement to probe the Form II/Form I crystal polymorphism in random copolymers of butene-1 with either ethylene or propylene
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Time-resolved micro-indentation hardness measurement to probe the Form II/Form I crystal polymorphism in random copolymers of butene-1 with either ethylene or propylene

机译：时间分辨的显微压痕硬度测量，以探测丁烯-1与乙烯或丙烯的无规共聚物中的晶型II /晶型I晶型

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摘要

Time-resolved micro-indentation hardness measurements have been performed on random copolymers of butene-1 with minor amount of ethylene or propylene during the room-temperature transition of the Form II mesophase into Form I crystals. The microhardness depends on the present crystal polymorph and increases during the Form II-Form I phase transformation, which is completed faster in the random copolymers than in the butene-1 homopolymer. It is furthermore observed that the microhardness decreases with increasing concentration of ethylene and propylene co-units in the random copolymers. This experimental result is comprehensively discussed in view of the observed decreases of the crystallinity and crystal perfection in copolymers containing ethylene or propylene, respectively. Analysis of a copolymer with about 11 mol% propylene revealed that the microhardness of copolymers containing Form I' crystals, formed directly from the melt, is higher than the initial microhardness of samples of lower co-unit content containing only Form II mesophase.
机译：在II型中间相室温转变为I型晶体的室温下，对丁烯-1与少量乙烯或丙烯的无规共聚物进行了时间分辨的微压痕硬度测量。显微硬度取决于当前的晶体多晶型物，并在II型-I型相变过程中增加，在无规共聚物中完成的速度比在1-丁烯均聚物中完成的速度快。此外观察到，随着无规共聚物中乙烯和丙烯共单元的浓度增加，显微硬度降低。考虑到分别在含有乙烯或丙烯的共聚物中观察到的结晶度降低和晶体完善性的降低，对该实验结果进行了全面讨论。对具有约11 mol％丙烯的共聚物的分析表明，直接由熔体形成的，包含形式I'晶体的共聚物的显微硬度高于仅包含形式II中间相的较低共单元含量样品的初始显微硬度。

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