Mechanical properties of melt-fabricated, drawn films of A–B–A triblock copolymers of poly(l-lactide) (A) and two types of polyethers (B)

IF 2.8 4区工程技术 Q2 POLYMER SCIENCE

Macromolecular Research Pub Date : 2024-06-19 DOI:10.1007/s13233-024-00271-9

Kazunari Masutani, Yasunori Yoshioka, Yoshiharu Kimura, Chan Woo Lee

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Abstract

High-molecular-weight ABA triblock copolymers (PLA–PEs–PLA), consisting of poly-l-lactide (PLLA: A) and two types of polyethers (PEs: B), i.e., poly(oxyethylene) (PEG: polyethylene glycol) and Pluronic^® [PN: poly(oxyethylene)-b-poly(oxypropylene)-b-poly(oxyethylene)], were synthesized by ring-opening polymerization of l-lactide by using bis-hydroxyl-terminated PEs as macroinitiators. Polymer films of these block copolymers were fabricated by the conventional hot-pressing method and uniaxially cold drawn to five times at 80 °C. Evaluation of the mechanical properties of these films revealed that the drawn films can retain high strength (ca. 100 MPa) and improved flexibility (2 GPa in modulus). It was therefore evident that the drawn films of PLLA–PEs triblock copolymers are highly useful as flexible films that can be controlled by the PEs content.

Graphical abstract

The A–B–A triblock copolymers consisting of PLLA and polyethers (PE: PEG and PN) were synthesized by the ROP of l-lactide in the presence of telechelic PE as the macroinitiators. The drawn films of these block copolymers were found to compete with the conventional petroleum plastic films and exceed the current biobased and biodegradable polymer films in terms of toughness. Thus, the oriented copolymer films were shown to be highly useful for flexible PLLA-based films.

Abstract Image

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聚（l-内酰胺）A-B-A 三嵌段共聚物（A）和两种聚醚（B）熔融拉伸薄膜的机械性能

高分子量 ABA 三嵌段共聚物（PLA-PEs-PLA）由聚乳酸（PLA：A）和两种聚醚（PEs：B）组成，即：聚（氧乙烯）（PEG：聚乙二醇）和 Pluronic® [PN：聚（氧乙烯）-b-聚（氧丙烯）-b-聚（氧丙烯）]、聚氧乙烯（PEG：聚乙二醇）和 Pluronic® [PN：聚氧乙烯-b-聚氧丙烯-b-聚氧乙烯]组成。这些嵌段共聚物的聚合物薄膜采用传统的热压法制造，并在 80 °C 下进行了五次单轴冷拔。对这些薄膜机械性能的评估表明，拉伸薄膜可以保持较高的强度（约 100 兆帕）和较好的柔韧性（模量为 2 千兆帕）。图解摘要在远链聚乙烯作为大引发剂存在的情况下，通过对 l-内酰胺进行 ROP 合成了由 PLLA 和聚醚（PE：PEG 和 PN）组成的 A-B-A 三嵌段共聚物。研究发现，这些嵌段共聚物拉伸的薄膜可与传统的石油塑料薄膜相媲美，而且在韧性方面超过了目前的生物基和生物可降解聚合物薄膜。因此，拉伸共聚物薄膜对基于聚乳酸的柔性薄膜非常有用。

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来源期刊

Macromolecular Research 工程技术-高分子科学

CiteScore

4.70

自引率

8.30%

发文量

100

审稿时长

1.3 months

期刊介绍： Original research on all aspects of polymer science, engineering and technology, including nanotechnology Presents original research articles on all aspects of polymer science, engineering and technology Coverage extends to such topics as nanotechnology, biotechnology and information technology The English-language journal of the Polymer Society of Korea Macromolecular Research is a scientific journal published monthly by the Polymer Society of Korea. Macromolecular Research publishes original researches on all aspects of polymer science, engineering, and technology as well as new emerging technologies using polymeric materials including nanotechnology, biotechnology, and information technology in forms of Articles, Communications, Notes, Reviews, and Feature articles.