公开(公告)号：US20200283595A1

公开(公告)日：2020-09-10

申请号：US16759327

申请日：2018-02-27

Applicant: SOOCHOW UNIVERSITY ,  ZHANGJIAGANG INSTITUTE OF INDUSTRIAL TECHNOLOGIES SOOCHOW UNIVERSITY

Inventor： Guozheng LIANG ,  Youhao ZHANG ,  Aijuan GU ,  Li YUAN

IPC: C08J11/12 ,  C08G59/42 ,  C07D327/00

Abstract: This invention provides a self-healable epoxy resin and its preparation, recycling and remolding method. With the catalyst of potassium iodide, an ester solution of 2-mercaptoacetic acid was oxidated by 30% H2O2 to form 2,2′-dithiodiacetic acid; then 2,2′-dithiodiacetic acid was dehydrated and cyclizated by anhydride to form 1,4,5-oxadithiepane-2,7-dione; 1,4,5-oxadithiepane-2,7-dione and methylhexahydrophthalic anhydride were mixed by mass ratio and cured with epoxides to get the self-healable epoxy resin. Through controlling dynamic and permanent three-dimensional crosslinked network, the self-healable epoxy resins provided in this invention exhibit high thermal resistance and improved mechanical properties as well as excellent self-healing ability, recyclability and remoldability. This invention provides a preparation method with the merits of low cost, simple production processes, broad application prospects and strong utility.

公开(公告)号：US20200308407A1

公开(公告)日：2020-10-01

申请号：US16759328

申请日：2018-07-04

Applicant: SOOCHOW UNIVERSITY

Inventor： Guozheng LIANG ,  Youhao ZHANG ,  Aijuan GU ,  Li YUAN

IPC: C08L83/08 ,  C08L75/02 ,  C08J5/18 ,  B29C71/02

Abstract: This invention provides a scrollable and foldable transparent polysiloxane film and its preparation and self-healing method. 2-Hydroxyethyl disulfide, diisocyanate and alkane chloride were mixed and reacted to get disulfide-containing diisocyanate. α,ω-Aminopropyl terminated polydimethylsiloxane, diisocyanate and alkane chloride were mixed and reacted get linear chain-extended polydimethylsiloxane. Linear chain-extended polydimethylsiloxane, multi-amino terminated hyperbranched polysiloxane, disulfide-containing diisocyanate and alkane chloride were mixed and poured into a mould. After drying, the scrollable and foldable transparent polysiloxane film was obtained. The polysiloxane film described in this invention are constructed by dynamic physical crosslinking induced by hydrogen bond and permanent chemical crosslinking generated by hyperbranched polysiloxane. Hence, the polysiloxane film achieves both high stiffness and toughness. The good self-healing behavior of the polysiloxane films is originated from the temperature controlled dissociation of hydrogen bonds and exchange reaction rate of disulfide bonds.