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首页> 外文期刊>Journal of Applied Polymer Science >Controllable Reinforcement of Stiffness and Toughness of Polypropylene via Thermally Induced Self-Assembly of β-Nucleating Agent
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Controllable Reinforcement of Stiffness and Toughness of Polypropylene via Thermally Induced Self-Assembly of β-Nucleating Agent

机译：β-成核剂的热诱导自组装可控地增强聚丙烯的刚度和韧性

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摘要

An easy approach was reported to achieve the simultaneous reinforcement and toughening of polypropylene (PP) via thermally induced self-assembly of β-nucleating agent (TMB-5). The results showed that the processing temperatures dictated the solubility and self-assembly of TMB-5 in the polymer melts to determine the subsequent morphology development of PP. At low processing temperature, TMB-5 did not dissolve into the polymer melt but remained original shape to induce PP to crystallize into spherulites so that it only promoted the formation of β-form crystals to enhance the toughness of the samples. At high processing temperature, TMB-5 gradually dissolved into the polymer melts. On cooling, the dissolved nucleating agent self-assembled into high aspect ratio fibrils through intermolecular hydrogen-bonding interactions. Due to a favorable matching between PP and TMB-5, PP preferred to nucleate and grow orthogonally to the fibril axis and into oriented hybrid shish-kebab morphology with rich β-form crystals. Compared with isotropic spherulites, the anisotropic structure exhibited excellent properties of the β-form crystal and shishkebab morphology to simultaneously improve the strength and toughness of TMB-5-modified PP samples. With the increasing processing temperature, more dissolved TMB-5 was involved in the self-assembly procedure to generate longer fibrils and induce more lamellae to grow on the surface. As a consequence, the anisotropy of the PP samples increased further, bringing out more improvements of the tensile strength.
机译：据报道，一种简单的方法是通过热诱导的β成核剂（TMB-5）的自组装实现聚丙烯（PP）的同时增强和增韧。结果表明，加工温度决定了TMB-5在聚合物熔体中的溶解度和自组装，从而决定了随后PP的形态发展。在较低的加工温度下，TMB-5不会溶解到聚合物熔体中，而是保持原始形状以诱导PP结晶成球晶，因此它只能促进β型晶体的形成，从而增强样品的韧性。在较高的加工温度下，TMB-5逐渐溶解到聚合物熔体中。冷却后，溶解的成核剂通过分子间氢键相互作用自组装成高长径比的原纤维。由于PP和TMB-5之间的良好匹配，PP优选成核并正交于原纤维轴生长，并取向成具有丰富的β-型晶体的取向的混合烤肉串形态。与各向同性球晶相比，各向异性结构表现出出色的β形晶体和羊肉串形态，同时提高了TMB-5改性PP样品的强度和韧性。随着加工温度的升高，更多的溶解TMB-5参与了自组装过程，以生成更长的原纤维并诱导更多的薄片在表面生长。结果，PP样品的各向异性进一步增加，带来了拉伸强度的更多改善。

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