Reprocessed and shape memory networks involving poly(hydroxyl ether ester) and polydimethylsiloxane through Diels-Alder reaction. (5th November 2021)

• Record Type: Journal Article
• Authors: Li, Lei; Qin, Xiulian; Mei, Honggang; Liu, Liyue; Zheng, Sixun
• Is Part Of: European polymer journal. Volume 160(2021)
• Publication Date: 2021-11-05
• Subjects: Poly(hydroxyl ether ester) -- Polydimethylsiloxane -- Diels-Alder reaction -- Reprocessing properties -- Shape memory polymers; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; Polymerization; Polymers; Periodicals; Electronic journals; 547.705
• DOI: 10.1016/j.eurpolymj.2021.110811
• Languages: English
• ISSNs: 0014-3057

Abstract

Graphical abstract: Highlights: Poly(hydroxyl ether ester) vitrimers were prepared via D-A reaction. Polydimethylsiloxane was used as the modifier to improve the properties. The vitrimers were microphase-separated and had shape memory properties. The original shapes can be reprogrammed with the reprocessing properties. Abstract: In this contribution, we reported a novel synthesis of poly(hydroxyl ether ester)-polydimethylsiloxane vitrimers through Diels-Alder (DA) reaction. Poly(hydroxyl ether ester) with furan rings in the main chain (denoted PHEE-F) was synthesized by the step-growth polymerization between diglycidyl ether of bisphenol A and 2, 5-furan dicarboxylic acid. The as-obtained PHEE-F was crosslinked with bismaleimide (BMI) via DA reaction to obtain the networks. To improve the thermomechanical properties of the networks, an α, ω-dimaleimido-terminated polydimethylsiloxane telechelics (denoted MA-PDMS-MA) was then synthesized and additionally used as the macromolecular co-crosslinker. It was found that the PDMS-modified networks were microphase-separated; the PDMS blocks were segregated into the microdomains with the size of 20 ∼ 30 nm. The thermomechanical properties of PHEE-F-PDMS networks were dependent on the contents of PDMS. More importantly, the crosslinked networks can be reprocessed (or recycled) at the retro -DA reaction temperature (>120 °C). In addition, the vitrimers exhibited the excellent shape memory properties. The reprocessability of the vitrimers can be exploited to reprogram the original shapes of the shape memory polymers.