Toughening Polylactic Acid with Epoxidized Natural Rubber via Altering the Dicumyl Peroxide Mixing Sequence

IF 4.7 3区工程技术 Q2 ENGINEERING, ENVIRONMENTAL

Journal of Polymers and the Environment Pub Date : 2024-10-09 DOI:10.1007/s10924-024-03429-9

Kantima Chaochanchaikul, Poomirat Nawarat, Sirinthorn Thongsang

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Abstract

The effect of the sequence to add dicumyl peroxide (DCP) to the polylactic acid (PLA) and epoxidized natural rubber (ENR) blending was investigated. According to the tensile and impact resistance tests, premixing DCP with ENR resulted in blends with better mechanical properties where nearly 20 times improvement of impact strength was observed at 30wt% ENR. In addition, the chemical, morphological, and thermal properties of PLA/ENR blends were investigated via Fourier-transform infrared spectroscopy, scanning electron microscopy, and differential scanning calorimetry analysis, respectively. When DCP is premixed with ENR, DCP could act more effectively as a vulcanizing agent than a compatibilizer, whereas the DCP mixing with PLA/ENR blending of PLA/ENR might lead to more PLA chain scission than DCP premixing with ENR. This study indicated that the toughening of PLA/ENR blends can be significantly enhanced when high ENR vulcanization together with the formation of small PLA phases.

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通过改变过氧化二氨基的混炼顺序，环氧化天然橡胶增韧聚乳酸

研究了过氧化二umyl （DCP）在聚乳酸（PLA）与环氧化天然橡胶（ENR）共混中加入顺序的影响。根据拉伸和抗冲击性能测试，将DCP与ENR预混得到的共混物具有更好的力学性能，在30wt% ENR下，其冲击强度提高了近20倍。此外，通过傅里叶变换红外光谱、扫描电镜和差示扫描量热分析，分别研究了PLA/ENR共混物的化学、形态和热性能。当DCP与ENR预混时，DCP作为硫化剂比增容剂更有效，而DCP与PLA/ENR共混比DCP与ENR预混可导致更多的PLA链断裂。研究表明，高ENR硫化同时形成小PLA相时，PLA/ENR共混物的增韧性显著增强。

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来源期刊

Journal of Polymers and the Environment 工程技术-高分子科学

CiteScore

9.50

自引率

7.50%

发文量

297

审稿时长

9 months

期刊介绍： The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.