High-toughening modification of polylactic acid by long-chain hyperbranched polymers
Jianjian Sun
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing, China
Search for more papers by this authorCorresponding Author
Yujuan Jin
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing, China
Correspondence
Yujuan Jin and Huafeng Tian, School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China.
Email: [email protected] and [email protected]
Search for more papers by this authorBo Wang
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Search for more papers by this authorCorresponding Author
Huafeng Tian
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing, China
Correspondence
Yujuan Jin and Huafeng Tian, School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China.
Email: [email protected] and [email protected]
Search for more papers by this authorKaier Kang
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Search for more papers by this authorShuang Men
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing, China
Search for more papers by this authorYunxuan Weng
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing, China
Search for more papers by this authorJianjian Sun
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing, China
Search for more papers by this authorCorresponding Author
Yujuan Jin
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing, China
Correspondence
Yujuan Jin and Huafeng Tian, School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China.
Email: [email protected] and [email protected]
Search for more papers by this authorBo Wang
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Search for more papers by this authorCorresponding Author
Huafeng Tian
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing, China
Correspondence
Yujuan Jin and Huafeng Tian, School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China.
Email: [email protected] and [email protected]
Search for more papers by this authorKaier Kang
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Search for more papers by this authorShuang Men
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing, China
Search for more papers by this authorYunxuan Weng
School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing, China
Search for more papers by this authorFunding information: Beijing Young Top-notch Personnel Foundation, Grant/Award Number: CIT&TCD201804030; National Natural Science Youth Foundation, Grant/Award Number: 51503007; Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Grant/Award Number: QETHSP2020013
Abstract
The hyperbranched polyester synthesized by “one-step method” was grafted with stearic acid to obtain long-chain hyperbranched polymers (LCHBPs) with a large number of long stearic acid chains at the end. By means of FTIR and 13C-NMR characterization, it was proved that stearic acids were grafted onto hyperbranched polyesters (HBPE) to yield LCHBPs successfully. It was determined by GPC and hydroxyl value titration that the number average molecular weight of HBPE was 4.86 × 103 and the grafting rate of stearic acid was 47%. Polylactic acid (PLA)/LCHBPs blends were prepared by melt processing method. The results showed that comparing with neat PLA, the tensile strength of PLA/LCHBPs blends decreased slightly with the increase of LCHBPs, but still maintained a high level, while the elongation at break and the impact strength of the PLA with 3.0 phr LCHBPs were greatly improved by 1360.0% and 119.8%, respectively. In addition, the impacted fracture characteristics of PLA changed significantly from brittle fracture to ductile fracture after LCHBPs incorporation, with the formation of a large number of filamentous structures. Thus, LCHBPs was an excellent toughening modifier for PLA and the resulting blends with improved performance possess wider applications.
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