私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

Links
Contact Info.
  • Address:重慶市北碚區(qū)天生路2號
  • Zip:400715
  • Tel:18580254939
  • Fax:
  • Email:jbzeng@swu.edu.cn
Current Location :> Home > News > Text
ACS Sustainable Chemistry & Engineering:源于環(huán)氧大豆油與香草醛的可持續(xù)環(huán)氧類玻璃高分子

標題:Sustainable Epoxy Vitrimers from Epoxidized Soybean Oil and Vanillin

摘要:Epoxidized soybean oil (ESO)-derived epoxy thermosets are usually limited by their poor mechanical properties and non-reprocessability. Herein, we report sustainable epoxy vitrimers synthesized facilely by curing ESO with vanillin-derived Schiff base (VSB) dynamic hardener with 1,2-dimethylimidazole as an accelerator. The phenolic hydroxyl of VSB showed high reactivity toward the epoxy group of ESO with a curing activation energy of 108.9 kJ·mol–1. The network rigidness and cross-link density of the epoxy vitrimers are adjustable by simply changing the feed ratio of flexible ESO and rigid VSB, which enables us to tailor the mechanical properties of the vitrimers easily over a wide range from soft to tough and hard. The dynamic Schiff base bonds provide the epoxy vitrimer with excellent reprocessability, weldability, reconfigurability, and programmability, which facilitates the recycling and processing of the cured epoxy materials. With tunable mechanical properties, reprocessability, and multifunctionality, the ESO-derived epoxy vitrimers are of great potential as alternatives to traditional epoxy thermosets.

全文鏈接:https://pubs.acs.org/doi/10.1021/acssuschemeng.0c05727