Supertough polylactide-based materials with fast shrinking property by stereocomplex crystallites through in situ reactive blending

Qi, Jialu; Yang, Zhiyuan; Ou, Yangtao; Jiang, Feng; Wang, Zhongkai; Zhang, Yaqiong

doi:10.1016/j.indcrop.2022.115326

Cited by 3 publications

(1 citation statement)

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“…PLA blends with vulcanized natural rubber have also been studied to achieve enhanced toughness. [27][28][29][30] However, presence of crosslinked phase in the blend has some drawbacks with respect to biodegradability and recyclability. It is well known that biodegradability of crosslinked polymers is so difficult because of network structure.…”

Section: Introductionmentioning

confidence: 99%

Enhanced strength and toughness of polylactic acid by blending with modified natural rubber having acetate pendant group

Ozbay

Gumus

2023

Journal of Elastomers & Plastics

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Among biobased and biodegradable polymers, polylactic acid (PLA) is most widely used one. However, its poor mechanical properties need to be enhanced. In this study, PLA blend film with improved mechanical properties were developed without compromising any bio-content. For this, natural rubber derivative with acetate pendant group (ANR) and PLA blend films were prepared. First, natural rubber was epoxidized, and then partial acetylation was achieved by the ring-opening reaction of the epoxy groups. The epoxidation and the acetylation were examined by FTIR analysis. 1H-NMR spectrum revealed a 29% epoxidation and 8.25% acetylation degree. The Tg of natural rubber (−66°C) increased to −41°C and −31°C after epoxidation and acetylation, respectively. The compatibility of ENR and ANR with PLA was evident from the DSC results and Molau test. The morphology of PLA blend film containing 25 wt% of ANR (ANR25) was observed as well-dispersed fine droplets by SEM images. The tensile strength, elastic modulus, and yield strength of ANR25 were measured as 11.6 MPa, 397.3 MPa, and 6.9 MPa, respectively. These values are considerably higher than neat PLA film. Compared to reported studies on PLA toughening so far, increments in both the strength and elongation of ANR25 were observed by tensile tests. Moreover, highest toughness among all samples was determined as 18.8 MJm−3 for ANR25, which is 1.8 times higher than neat PLA. Thus, a strong and tough bio-based PLA blend was developed for film application such as packaging and sheeting.

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Section: Introductionmentioning

confidence: 99%