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首页> 外文期刊>ACS Omega >Structural Evolution and Toughening Mechanism of β-Transcrystallinity of Polypropylene Induced by the Two-Dimensional Layered Interface during Uniaxial Stretching
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Structural Evolution and Toughening Mechanism of β-Transcrystallinity of Polypropylene Induced by the Two-Dimensional Layered Interface during Uniaxial Stretching

机译：双轴拉伸期间二维分层界面诱导的聚丙烯β-透囊的结构演化和增韧机理

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摘要

The structure and morphology of β-crystals of isotactic polypropylene (iPP) are of great significance because β-crystals can improve the toughness and ductility of iPP. Toughening of β-spherulites, which was ascribed to phase transformation, has been extensively investigated. However, the toughening mechanism of other β-crystals with special structures and morphologies is not clear. In this study, β-transcrystallinity (β-TC), which showed a greater toughening effect than that of β-spherulite, was constructed through microlayered coextrusion. During uniaxial stretching, β-TC preferred to transform into an α-crystal, whereas β-spherulite preferred to transform to a smectic mesophase. The transformation degree of β-TC was much higher than that of β-spherulite. More importantly, the lamellar fragments from β-TC gradually rearranged along the stretching direction, accompanied by continuous absorption of energy. The special β–α phase transformation, high transformation rate, and rearrangement of lamellar fragments led to the highly improved toughness of the layered samples.
机译：等立方聚丙烯（IPP）的β-晶体的结构和形态具有重要意义，因为β-晶体可以改善IPP的韧性和延展性。广泛地研究了β-球晶的增韧，其归因于相变。然而，具有特殊结构和形态学的其他β晶体的增韧机制尚不清楚。在该研究中，通过微层共挤出构建了β-经晶度（β-Tc），其显示比β-球骨的增韧效果更高。在单轴拉伸期间，β-Tc优选转化为α晶体，而β-球晶醇均优选转化为近透明的中间相。 β-Tc的转化度远高于β-球杆菌的变化程度。更重要的是，来自β-TC的层片段沿拉伸方向逐渐重新排列，伴随着连续吸收能量。特殊的β-α相变，高转化率和层状片段的重排导致了层状样品的高度改善的韧性。

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