Tailoring End-Use Properties of Polypropylene through a Combination of Specific Nucleation and Long-Chain Branching

IF 4.1 2区化学 Q2 POLYMER SCIENCE Chinese Journal of Polymer Science Pub Date : 2024-11-07 DOI:10.1007/s10118-024-3234-1

Lenka Gajzlerova, Jana Navratilova, Martina Polaskova, Lubomir Benicek, David Jaska, Sona Zenzingerova, Roman Cermak

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Abstract

The present study presents an assessment of the interrelations between long-chain branching, specific nucleation, and end-use properties of polypropylene blends: blends of linear polypropylene (L-PP) and long-chain branched polypropylene (LCB-PP) modified by a specific β-nucleating agent (NA). Specimens with various LCB-PP compositions with and without NA were prepared under complex flow fields by injection molding. Wide-angle X-ray scattering was employed to capture the X-ray patterns of both the skin and core of the specimens, determining the overall crystallinity and amounts of individual polymorphs. The increasing content of LCB-PP and γ-phase, at the same time, in the blends is reflected in both increasing crystallinity and improved mechanical properties, namely, yield stress and Young’s modulus. On the other hand, the composition of the blends had no significant effect on the impact strength, except for nucleated L-PP. It has been demonstrated that adding a relatively small amount of LCB-PP is sufficient to modify the mechanical properties of linear polypropylene. Even a very small amount of LCB-PP in the L-PP suppressed the effectiveness of NA.

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通过特定成核和长链支化的结合来调整聚丙烯的最终用途性能

本研究评估了聚丙烯共混物的长链分支、特定成核和最终使用性能之间的相互关系：线性聚丙烯（L-PP）和经特定β-成核剂（NA）改性的长链支化聚丙烯（LCB-PP）共混物。在复杂的流场条件下，采用注射成型的方法制备了不同LCB-PP成分（含NA和不含NA）的试样。广角x射线散射用于捕获标本皮肤和核心的x射线模式，确定总体结晶度和单个多态性的数量。同时，随着LCB-PP和γ相含量的增加，共混物的结晶度增加，屈服应力和杨氏模量的力学性能也有所改善。另一方面，共混物的组成对冲击强度没有显著影响，但有核的L-PP除外。研究表明，加入相对少量的LCB-PP就足以改变线性聚丙烯的力学性能。即使是L-PP中极少量的LCB-PP也会抑制NA的有效性。

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来源期刊

Chinese Journal of Polymer Science 化学-高分子科学

CiteScore

7.10

自引率

11.60%

发文量

218

审稿时长

6.0 months

期刊介绍： Chinese Journal of Polymer Science (CJPS) is a monthly journal published in English and sponsored by the Chinese Chemical Society and the Institute of Chemistry, Chinese Academy of Sciences. CJPS is edited by a distinguished Editorial Board headed by Professor Qi-Feng Zhou and supported by an International Advisory Board in which many famous active polymer scientists all over the world are included. The journal was first published in 1983 under the title Polymer Communications and has the current name since 1985. CJPS is a peer-reviewed journal dedicated to the timely publication of original research ideas and results in the field of polymer science. The issues may carry regular papers, rapid communications and notes as well as feature articles. As a leading polymer journal in China published in English, CJPS reflects the new achievements obtained in various laboratories of China, CJPS also includes papers submitted by scientists of different countries and regions outside of China, reflecting the international nature of the journal.