Preparation and Properties of Multiblock Polyester Synthesized by Chain Extension Copolymerization of poly(L-lactic acid) and poly(Butylene Carbonate) Prepolymer

IF 5 3区工程技术 Q2 ENGINEERING, ENVIRONMENTAL Journal of Polymers and the Environment Pub Date : 2025-02-21 DOI:10.1007/s10924-025-03517-4

Shaozhe Yang, Rong Wu, Wei Bai, Qingyin Wang, Jianguo Li, Gongying Wang

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Abstract

Hydroxyl-terminated poly(L-lactic acid) (PLLA-OH) and poly(butylene carbonate) prepolymer (PBC-OH) were synthesized via ring-opening(ROP) polymerization of lactide and ester exchange polymerization of dimethyl carbonate (DMC) and 1,4-butanediol (BDO), respectively. Subsequently, a chain extension reaction was conducted using diisocyanate as a chain extender to produce a biodegradable multiblock copolymer ester PLLA-PBC. The structural characteristics and molecular weight of PLLA-PBC with different block lengths and mass fractions were analyzed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (¹H-NMR) and gel permeation chromatography (GPC). The impact of PLLA-PBC’s structure on its properties was examined through various characterization techniques, including differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and tensile testing. The DSC findings revealed that the glass transition temperature of the multiblock copolyester lies between those of PLLA-OH and PBC-OH, with variations in component content leading to a reduction in crystallinity. In addition, tensile tests showed that the addition of PBC segments significantly increased the elongation at break of PLLA.

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聚l -乳酸与聚碳酸丁烯预聚物扩链共聚合成多嵌段聚酯的制备及性能

采用丙交酯开环（ROP）聚合、碳酸二甲酯（DMC）和1,4-丁二醇（BDO）酯交换聚合，分别合成了端羟基聚l-乳酸（PLLA-OH）和聚碳酸丁二醇预聚物（PBC-OH）。随后，以二异氰酸酯为扩链剂进行扩链反应，制得可生物降解的多嵌段共聚物酯pla - pbc。采用傅里叶变换红外光谱（FTIR）、核磁共振（1H-NMR）和凝胶渗透色谱（GPC）分析了不同块长和质量分数的pla - pbc的结构特征和分子量。通过各种表征技术，包括差示扫描量热法（DSC）、热重分析（TGA）、x射线衍射（XRD）和拉伸测试，研究了pla - pbc的结构对其性能的影响。DSC结果表明，多嵌段共聚酯的玻璃化转变温度介于PLLA-OH和PBC-OH之间，组分含量的变化导致结晶度的降低。此外，拉伸试验表明，PBC片段的加入显著提高了PLLA的断裂伸长率。

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来源期刊

Journal of Polymers and the Environment 工程技术-高分子科学

CiteScore

9.50

自引率

7.50%

发文量

297

审稿时长

9 months

期刊介绍： The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.