Cross-Linked Networks in Poly(propylene carbonate) by Incorporating (Maleic Anhydride/ cis-1,2,3,6-Tetrahydrophthalic Anhydride) Oligomer in CO2/Propylene Oxide Copolymerization: Improving and Tailoring Thermal, Mechanical, and Dimensional Properties

Meiying Huang; Lijun Gao; Jiuying Feng; Xuyi Huang; Zengquan Li; Zetian Huang; Lingyun Wang

doi:10.1021/acsomega.0c02608

Cross-Linked Networks in Poly(propylene carbonate) by Incorporating (Maleic Anhydride/ cis-1,2,3,6-Tetrahydrophthalic Anhydride) Oligomer in CO₂/Propylene Oxide Copolymerization: Improving and Tailoring Thermal, Mechanical, and Dimensional Properties

ACS Omega. 2020 Jul 9;5(28):17808-17817. doi: 10.1021/acsomega.0c02608. eCollection 2020 Jul 21.

Authors

Meiying Huang^{1

2}, Lijun Gao¹, Jiuying Feng¹, Xuyi Huang¹, Zengquan Li¹, Zetian Huang¹, Lingyun Wang²

Affiliations

¹ School of Chemistry and Chemical Engineering, Key Laboratory of Clean Energy Materials Chemistry of Guangdong Higher Education Institutes, Resource and Chemical Engineering Technology Research Center of Western Guangdong Province, Lingnan Normal University, Zhanjiang 524048, China.
² School of Chemistry and Chemical Engineering, Key Laboratory of Functional Molecular Engineering of Guangdong Province, South China University of Technology, Guangzhou 510641, China.

Abstract

Poly(propylene carbonate) (PPC) from CO₂ and propylene oxide (PO) has wide potential applications as a degradable "plastic". However, the thermal stability and mechanical properties of PPC cannot meet most of the application requirements. Herein, we focus on improving these properties. A (maleic anhydride/cis-1,2,3,6-tetrahydrophthalic anhydride) (MA/THPA) oligomer containing several cyclocarboxylic anhydride groups, which can copolymerize with PO, has been readily synthesized and used as the third comonomer to prepare PPC with cross-linked networks. The gel contents increase from 16 to 42% with increasing MA/THPA oligomer feed contents from 0.5 to 4 wt % of PO. The formation of cross-linked networks in PPC greatly improves the thermal, mechanical, and dimensional properties. The 5% weight-loss degradation temperature increases from 217 °C to nearly 290 °C before and after cross-linking, which ensures that PPC does not decompose in melt processing. The tensile strength of the copolymer is in the range of 22.2-44.3 MPa with elongation at break of 11-312%. The maximum tensile strength is improved by 143% compared to that of PPC. When the MA/THPA oligomer feed is above 3 wt % of PO, the hot-set elongation of the copolymer at 65 °C decreases more than 10 times when compared with that of PPC, and the permanent deformation is close to 0, while it is 145% for PPC. The dimensional stability is improved sharply. It can overcome the cold flow phenomenon of PPC. The improvement of the above comprehensive properties is of great significance to the practical application of PPC in various fields.