Abstract
Biodegradable multiblock copolymers based on poly[(3-hydroxybutyrate)-co-(3-hydroxyvalerate)] (PHBV), poly(ε-caprolactone) (PCL), and polyhedral oligomeric silsesquioxane (POSS) were synthesized by one-step copolymerization with 1,6-hexamethylene diisocyanate (HDI) as a coupling agent. The chemical structures, molecular weight, and polydispersity index of the PHBV/PCL/POSS multiblock copolymers were confirmed by 1H NMR, FTIR, and gel permeation chromatography (GPC). XRD analysis illustrated that PHBV and POSS blocks in multiblock copolymers with high content of PHBV and POSS could crystallize to form separate crystalline phases. DSC analysis indicated that the mutual interference of crystallization of PHBV, PCL, and POSS blocks existed. Compared with the crystallinity of PHBV-diol and original PHBV, the crystallinity of PHBV block decreased from 54.8 (original PHBV) and 49.5 (PHBV-diol) to 25.5%. TG measurement revealed that thermal degradation of the multiblock copolymers proceeded by a four-step degradation process and the thermal degradation behavior of PHBV block was similar to that of the original PHBV. The melt processing window of multiblock copolymers was much wider than that of the original PHBV. The results of tensile testing showed that the tensile strength at break of the fibrous membranes of multiblock copolymers increased by 37.5% from 0.8 to 1.1 MPa and the elongation at break reached 307.8%.
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Funding
This research was supported by the National Natural Science Foundation of China (51403084), the Key Research and Development Program (Industry Forward and Common Key Technology) Project of Suqian City (H201708), the Jiangsu Overseas Research Training Program for University Prominent Young and Middle-Aged Teachers and Presidents, the Natural Science Foundation of Jiangsu Province (BK20130142), the Foundation of Key Laboratory of Pulp and Paper Science and Technology of Ministry of Education/Shandong Province of China (KF201714), the 111 Project (B17021), the Priority Academic Program Development of Jiangsu Higher Education Institutions, and the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (PPZY2015B147).
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Xia, S., Shen, Y., Zhou, Y. et al. Biodegradable multiblock copolymers containing poly[(3-hydroxybutyrate)-co-(3-hydroxyvalerate)], poly(ε-caprolactone), and polyhedral oligomeric silsesquioxane: synthesis, characterization, and tensile property. Colloid Polym Sci 296, 1667–1677 (2018). https://doi.org/10.1007/s00396-018-4389-5
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DOI: https://doi.org/10.1007/s00396-018-4389-5