Effective photo-crosslinking behavior of cinnamate-terminated star-shaped polylactides

IF 2.8 4区工程技术 Q2 POLYMER SCIENCE Macromolecular Research Pub Date : 2024-06-19 DOI:10.1007/s13233-024-00272-8

Kazunari Masutani, Hiroko Nakayama, Yoshiharu Kimura, Chan Woo Lee

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Abstract

Star-shaped poly(l-lactide) (starPLLA) and poly(d-lactide) (starPDLA) were synthesized, and their terminal groups were capped with cinnamate functionalities to obtain cinnamate-terminated star-shaped polylactides (C-starPLLA and C-starPDLA). It was confirmed that both starPLLA and C-starPLLA showed better solubility in various organic solvents than their corresponding linear polylactides. Polymer films of C-starPLLA and its blends with C-starPDLA (C-starPLLA/PDLA) were effectively crosslinked by UV irradiation. The molecular weights of the films were found to become higher when the irradiation was done after annealing the films, suggesting that the increased polymer crystallization by the annealing ought to promote the concentration of the cinnamate functionalities in the amorphous domain, inducing the subsequent terminal photo-crosslinking more efficiently. Furthermore, the aqueous emulsions of C-nPLAs and C-starPLAs were successfully prepared and used for fabrication of their films by emulsion casting. When the resultant polymer films were annealed and UV-irradiated, the film was found to become much harder due to the higher degree of crosslinking. These results supported that the star-shaped structure with photo-crosslinkable terminals should be an effective approach to provide PLAs having improved processability and properties simultaneously.

Graphical Abstract

Star-shaped poly(L-lactide) (starPLLA) and poly(D-lactide) (starPDLA) were synthesized, and their terminal groups were capped with cinnamate functionalities to obtain cinnamate-terminated star-shaped polylactides (C-starPLLA and C-starPDLA). It was confirmed that both starPLLA and C-starPLLA showed better solubility in various organic solvents than their corresponding linear polylactides. Polymer films of C-starPLLA and its blend with C-starPDLA (C-starPLLA/PDLA) were effectively crosslinked by UV irradiation. These results supported that the star-shaped structure with photo-crosslinkable terminals should be an effective approach to provide PLAs having improved processability and properties simultaneously.

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肉桂酸酯封端星形聚乳酸的有效光交联行为

合成了星形聚（l-内酯）（starPLLA）和聚（d-内酯）（starPDLA），并用肉桂酸酯官能团封端它们，得到了肉桂酸酯封端的星形聚乳酸（C-starPLLA 和 C-starPDLA）。研究证实，星形聚乳酸（starPLLA）和星形聚乳酸（C-starPLLA）在各种有机溶剂中的溶解度均优于相应的线型聚乳酸。通过紫外线照射，C-starPLLA 及其与 C-starPDLA 的混合物（C-starPLLA/PDLA）的聚合物薄膜得到了有效交联。在对薄膜进行退火处理后再进行辐照，薄膜的分子量会变得更高，这表明退火处理增加了聚合物的结晶度，从而提高了肉桂酸官能团在无定形结构域中的浓度，更有效地诱导了后续的末端光交联。此外，还成功制备了 C-nPLAs 和 C-starPLAs 的水乳液，并通过乳液浇注法制造了它们的薄膜。将制得的聚合物薄膜进行退火和紫外线辐照，发现由于交联度更高，薄膜变得更加坚硬。图解摘要合成了星形聚（L-内酯）（starPLLA）和聚（D-内酯）（starPDLA），并用肉桂酸官能团封端它们，得到了肉桂酸封端的星形聚乳酸（C-starPLLA和C-starPDLA）。研究证实，星形聚乳酸（starPLLA）和星形聚乳酸（C-starPLLA）在各种有机溶剂中的溶解度均优于相应的线型聚乳酸。C-starPLLA 及其与 C-starPDLA 的混合物（C-starPLLA/PDLA）的聚合物薄膜在紫外线照射下可有效交联。这些结果表明，带有光交联端子的星形结构是同时改善聚乳酸加工性和性能的有效方法。

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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.