Journal
POLYMER TESTING
Volume 82, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2020.106324
Keywords
Thermoplastic vulcanizates; Polylactide; Epoxidized natural rubber; Dynamic vulcanization; Bi-continuous structure
Funding
- National Natural Science Foundation of China [31870548]
- Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-efficiency Utilization [2017ZZY2-10]
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The thermoplastic vulcanizates (TPVs) of Polylactide (PLA)/Epoxidized natural rubber (ENR) were prepared by dynamic vulcanization technology. The processing torque, crosslink density, morphology of PLA/ENR blends, and PLA's molecular weight during the processing were investigated by HAAKE rheometer, swelling measurement, scanning electron microscopy (SEM), and gel permeation chromatography (GPC). It was found that the vulcanization of ENR completed at the turning point after torque peak. After the turning point, the torque and crosslink density decreased with the processing time increasing. Moreover, the morphology of PLA/ENR blends showed bi-continuous structure during the dynamic vulcanization processing, and the phase size of PLA/ENR was increased with processing time and temperature. GPC results showed PLA degradation mainly happened after torque turning point. Thermal gravimetric analysis (TGA) results indicated that some parts of PLA would graft on ENR during processing, and the higher the processing temperature, the more the PLA was grafted.
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