Journal
JOURNAL OF POLYMERS AND THE ENVIRONMENT
Volume 30, Issue 8, Pages 3209-3217Publisher
SPRINGER
DOI: 10.1007/s10924-022-02427-z
Keywords
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV); Biodegradable; Hyperbranched polymer; Toughening
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Funding
- Beijing Young Top-notch Personnel Foundation [CITTCD201804030]
- Beijing Key Project of Natural Science [KZ201810011017]
- School Level Cultivation Fund of Beijing Technology and Business University for Distinguished and Excellent Young Scholars [BTBUYP2021]
- Open Fund of Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics (Beijing Technology and Business University)
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Hyperbranched polymer with flexible long chains was synthesized and used to toughen poly(3-hydroxybutyrate-co-3-hydroxyvalerate). The blends showed decreased crystallinity, increased impact strength, and elongation at break compared to the pure polymer.
Hyperbranched polymer with flexible long chains (sigma-CL) were synthesized based on hydroxyl terminated hyperbranched polyesters (HBPEs). The prepared HBP-CLs were used to toughen poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) by melt-blending. Comparing with pure PHBV, the crystallinity (X-c) of the PHBV/3.0phr HBP-CLs blends decreased by 10.2% (from 67.8 to 60.9%), the impact strength increased by 533.3% (from 5.1 kJ center dot m(- 2) to 32.3 kJ center dot m(- 2)), and the elongation at break increased by 160.5% (from 1.62 to 4.22%). With the increase of HBP-CLs, the fracture surface of the PHBV/HBP-CLs blends became rough and a significant decrease in crystallization area can be seen from POM images. Even filamentous structures and tiny holes was formed, which further demonstrated that HBP-CLs acted as an excellent toughening effect on PHBV.
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