Synthesis and Characterization of Hyperbranched Polyethylene-b-Polyester Copolymers

WEN Zhaoyang, ZHANG Zhichao, HAN Shuang, LI Shengyu

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Plastics Science and Technology ›› 2025, Vol. 53 ›› Issue (03) : 36-42. DOI: 10.15925/j.cnki.issn1005-3360.2025.03.007
Theory and Research

Synthesis and Characterization of Hyperbranched Polyethylene-b-Polyester Copolymers

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Abstract

Hydroxyl functionalized hyperbranched polyethylene (HBPE-OH) was prepared by thiol-ene click reaction between 2-mercaptoethanol and hyperbranched polyethylene. Using HBPE-OH as an initiator, racemic lactide and ε-caprolactone can be polymerized through ring opening polymerization using organic base 1,5,7-Triazabicylo[4.4.0]dec-5-ene (TBD) or di-n-butyl magnesium (MgBu2). It was found that the catalytic activity of the MgBu2/HBPE-OH catalytic system was higher than that of the TBD/HBPE-OH catalytic system. Thus, narrowly distributed (hyperbranched polyethylene)-b-(polylactide) and (hyperbranched polyethylene)-b-(polycaprolactone) block polymers were produced which were structurally characterized by 1H NMR spectroscopy and GPC. In addition, (hyperbranched polyethylene)-b-(polylactide)-b-(polycaprolactone) ternary block copolymers were prepared using a MgBu2/HBPE-OH catalyst and were characterized by nuclear magnetic resonance and GPC. The differential scanning calorimetry (DSC) characterization of the obtained block copolymer demonstrated that the glass transition temperature and melting point of the polymer increased with the increase of the length of the polyester chain segment. The ternary block copolymer has two melting points (200 ℃and 224 ℃) and a glass transition temperature of 136 ℃.

Key words

Hyperbranched polyethylene / Racemic lactide / ε-caprolactone / Ring opening polymerization / Block copolymers

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WEN Zhaoyang , ZHANG Zhichao , HAN Shuang , et al. Synthesis and Characterization of Hyperbranched Polyethylene-b-Polyester Copolymers. Plastics Science and Technology. 2025, 53(03): 36-42 https://doi.org/10.15925/j.cnki.issn1005-3360.2025.03.007

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