公开(公告)号：US20240182665A1

公开(公告)日：2024-06-06

申请号：US18285684

申请日：2022-04-05

Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

Inventor： Muhammad Rabnawaz ,  Ajmir Khan ,  Zahra Aayanifard ,  Muhammad Naveed

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

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

Abstract: 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.

公开(公告)号：US20240084166A1

公开(公告)日：2024-03-14

申请号：US18367079

申请日：2023-09-12

Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

Inventor： Muhammad Rabnawaz ,  Ajmir Khan

IPC: C09D175/04 ,  C09D5/00

CPC classification number: C09D175/04 ,  C09D5/00

Abstract: The disclosure relates to an omniphobic composition concentrate including 2 wt. % to 60 wt. % of at least one of a polyisocyanate and monomer units thereof in polymerized form, 30 wt. % to 85 wt. % of at least one of a polyol and monomer units thereof in polymerized form, 10 wt. % to 50 wt. % of at least one of a functionalized omniphobic polymer and monomer units thereof in polymerized form, and up to 60 wt. % of at least one diluent. The omniphobic composition further includes a polymer with monomer units of the polyisocyanate, monomer units of the polyol, and monomer units of the functionalized omniphobic polymer. The omniphobic composition is in the form of a gel-free liquid, and it can be cured with a polyol/polyisocyanate polyurethane base formulation to form a thermoset omniphobic composition.

公开(公告)号：US11529648B2

公开(公告)日：2022-12-20

申请号：US17419781

申请日：2020-01-29

Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

Inventor： Muhammad Rabnawaz ,  Ajmir Khan

IPC: B05D7/00 ,  C09D175/12 ,  C09D167/04 ,  C09D167/02 ,  C09D131/04 ,  C09D183/04 ,  B05D5/00

Abstract: The disclosure relates to a self-healing laminate composition. The composition includes a first, self-healing layer with a self-healing polymer and a second, mechanical layer adjacent to the first layer. The second layer includes any desired polymer, for example a crosslinked polymer, a thermoplastic polymer, or a functional thermoset polymer. Self-healing polymers with dynamic covalent bonds are suitable, for example those with dynamic urea bonds and/or dynamic urethane bonds. A self-healing polymer that is damaged can undergo autonomous repair when separated surfaces re-contact each other due to the soft nature of the self-healing polymer, whereupon reversible bonds can reform to rejoin and repair the damaged self-healing polymer. When the self-healing laminate according to the disclosure is damaged, the self-healing mechanism of the first layer can cause the repair of both layers. The self-healing laminate composition can be used as a coating on any of a variety of substrates to provide self-healing properties to a surface of the substrate.