公开(公告)号：US20240182665A1

公开(公告)日：2024-06-06

申请号：US18285684

申请日：2022-04-05

申请人： BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

发明人： Muhammad Rabnawaz ,  Ajmir Khan ,  Zahra Aayanifard ,  Muhammad Naveed

IPC分类号： C08J11/24 ,  B01J31/02 ,  B01J31/22 ,  C07C29/128 ,  C07C67/475 ,  C08J11/14 ,  C08J11/28

CPC分类号： C08J11/24 ,  B01J31/0237 ,  B01J31/2226 ,  C07C29/1285 ,  C07C67/475 ,  C08J11/14 ,  C08J11/28 ,  B01J2231/005 ,  B01J2531/26 ,  C08J2367/02 ,  C08J2367/04 ,  C08J2377/06

摘要： The disclosure relates to a method for chemically recycling a condensation polymer, which includes melt-processing a mixture including a condensation polymer and an internal catalyst to increase the amorphous content of the polymer, followed by depolymerizing polymer in a reaction medium with a reactive solvent. Melt-processing and quenching of a condensation polymer generally reduces the crystalline content of the polymer and correspondingly increases the amorphous content of the polymer, which makes the polymer more amenable to subsequent depolymerization. Inclusion of the internal catalyst, for example a volatile organic catalyst, during melt-processing not only improves the relative degree of amorphization during melt-processing, but it also enhances the rate and conversion of the depolymerization stage that would otherwise be rate-limited by mass transport of an external catalyst from the bulk reaction medium to the polymer surface for depolymerization.