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CRYSTALLIZATION AND THERMAL PROPERTIES OF PLLA COMB POLYMER

机译:PLLA梳状聚合物的结晶和热性能

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@@Poly(L-lactide) (PLLA) is a biodegradable and biocompatible thermoplastic polymer.However, PLLA suffers from the difficulty of controlled degradation based on its high crystallinity and induction of material defects, so it is necessary to modify the physical properties of the polymer. Comb polymers, also called macromolecular brushes, are receiving more and more attention.2 In this research, we focused on the the crystalline structures isothermal crystallization and melting behavior of PLLA comb polymer on PHEMA backbone. Poly(L-lactide) (PLLA) comb polymer on poly(2hydroxyethyl methacrylate) (PHEMA) backbone was prepared by a combination of atom transfer radical polymerization (ATRP) and ring-opening polymerization (ROP) (Figure 1). By1 HNMR, the average polymerization degrees of PHEMA backbone and PLLA brushes were determined to be 60 and 215, respectively. The GPC result showed that the molecular weight (Mn) of the polymer is about 79690 with a polydispersity of 1.68.
机译:聚(L-丙交酯)(PLLA)是一种可生物降解且具有生物相容性的热塑性聚合物,然而,PLLA因其高结晶度和材料缺陷的诱导而难以控制降解,因此有必要改变其物理性质。聚合物。梳状聚合物(也称为大分子刷)受到越来越多的关注。2在本研究中,我们重点研究了PLLA梳状聚合物在PHEMA主链上的晶体结构等温结晶和熔融行为。通过将原子转移自由基聚合(ATRP)和开环聚合(ROP)结合使用,在聚甲基丙烯酸2-羟乙酯(PHEMA)主链上制备了聚L-丙交酯(PLLA)梳型聚合物(图1)。通过1 HNMR,PHEMA主链和PLLA刷的平均聚合度分别确定为60和215。 GPC结果表明,该聚合物的分子量(Mn)约为79690,多分散性为1.68。

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