Enhanced thermal, rheological, mechanical, and morphological properties of reactive recycled PET/recycled PP blends: influence of long-chain branching

IF 4 3区化学 Q2 POLYMER SCIENCE

Polymer Bulletin Pub Date : 2025-07-05 DOI:10.1007/s00289-025-05891-4

Aboulfazl Barati, Erfan Dashtimoghadam, Shaoyang Liu

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Abstract

Recycled polyethylene terephthalate (rPET) was blended with 25-75 wt% of recycled polypropylene (rPP) by reactive blending in an internal mixer. Pyromellitic dianhydride (PMDA) was used as a chain extender for PET to modify the blends and improve their performance. Effects of the long-chain branched (LCB) structure of PMDA and nucleation effects of rPP on rPET were investigated quantitatively by studying morphology, rheological behavior, crystallization, thermal, and mechanical properties of the blends. Rheological behavior showed that modified rPET/rPP blends achieved significantly high storage moduli and complex viscosities after branching. Both X-ray diffraction (XRD) and differential scanning calorimetry (DSC) results showed that increasing the content of rPP in the blends led to an increase in crystallinity, suggesting that the rPP phase acts as a nucleating agent for the crystallization of rPET. A further finding was that PMDA decreased the degree of crystallinity because of the effect of LCB structure on crystallinity. In comparison to unmodified rPET/rPP blends, modified blends showed improved impact resistance. Nanomechanical mapping showed interfacial broadening between the rPET matrix and rPP dispersed phase, confirming the LCB’s effect. Moreover, SEM images showed an irregular surface at the grain boundary between rPET and rPP in modified blends, confirming enhanced interaction at the interface.

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活性再生PET/再生PP共混物的热、流变、机械和形态性能的增强：长链分支的影响

将再生聚对苯二甲酸乙二醇酯（rPET）与25% - 75%的再生聚丙烯（rPP）在内部混合器中进行反应共混。采用邻苯二甲酸二酐（PMDA）作为扩链剂对共混物进行改性，提高了共混物的性能。通过研究共混物的形貌、流变行为、结晶性能、热性能和力学性能，定量研究了PMDA长链支链（LCB）结构和rPP对rPET的成核效应的影响。流变学行为表明，改性后的rPET/rPP共混物在分支后具有显著的高存储模量和复杂粘度。x射线衍射（XRD）和差示扫描量热法（DSC）结果表明，共混物中rPP含量的增加导致结晶度的增加，表明rPP相对rPET结晶起成核剂的作用。进一步发现PMDA降低结晶度是由于LCB结构对结晶度的影响。与未改性的rPET/rPP共混物相比，改性共混物的抗冲击性能有所提高。纳米力学图显示rPET基体与rPP分散相之间的界面展宽，证实了LCB的作用。此外，SEM图像显示，在改性共混物中，rPET和rPP之间的晶界处出现了不规则的表面，证实了界面处的相互作用增强。

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来源期刊

Polymer Bulletin 化学-高分子科学

CiteScore

6.00

自引率

6.20%

发文量

审稿时长

5.5 months

期刊介绍： "Polymer Bulletin" is a comprehensive academic journal on polymer science founded in 1988. It was founded under the initiative of the late Mr. Wang Baoren, a famous Chinese chemist and educator. This journal is co-sponsored by the Chinese Chemical Society, the Institute of Chemistry, and the Chinese Academy of Sciences and is supervised by the China Association for Science and Technology. It is a core journal and is publicly distributed at home and abroad. "Polymer Bulletin" is a monthly magazine with multiple columns, including a project application guide, outlook, review, research papers, highlight reviews, polymer education and teaching, information sharing, interviews, polymer science popularization, etc. The journal is included in the CSCD Chinese Science Citation Database. It serves as the source journal for Chinese scientific and technological paper statistics and the source journal of Peking University's "Overview of Chinese Core Journals."