公开(公告)号：US20230340200A1

公开(公告)日：2023-10-26

申请号：US18007992

申请日：2021-06-03

Applicant: CLEMSON UNIVERSITY RESEARCH FOUNDATION

Inventor： SRIKANTH PILLA ,  JAMES SCOTT STERNBERG

IPC: C08G71/04

CPC classification number: C08G71/04 ,  C08G2101/00

Abstract: Bio-based polymer precursors and non-isocyanate polyurethanes (NIPU) and non-isocyanate polyurethane foams (NIPUF) that can be formed from the precursors, as well as methods for the synthesis of the precursors and the polyurethane products are described. The bio-based polymer precursors are formed through functionalization of a bio-based polyol, e.g., lignin, with cyclic carbonates. The bio-based polyol starting materials need not be pre-processed and can include Kraft lignin. NIPU/NIPUF can be synthesized through a ring opening curing reaction of cyclic carbonates of the bio-based polyol precursor with diamines. The carbonates and diamines can include non-toxic bio-based carbonates.

公开(公告)号：US20220017696A1

公开(公告)日：2022-01-20

申请号：US17380467

申请日：2021-07-20

Applicant: CLEMSON UNIVERSITY RESEARCH FOUNDATION

Inventor： SRIKANTH PILLA ,  JAMES SCOTT STERNBERG

IPC: C08G71/04

Abstract: Disclosed are bio-based poly(urethane amide) polymers and methods for forming the polymers. The bio-based polymers can be synthesized through a ring opening reaction between bio-based cyclocarbonated polymers that include aromatic and/or cyclic functionality within the polymer and oligomeric polyamides. The cyclocarbonated polymers can be based on bio-based polyols, e.g., lignin or lignin-based polyols, and/or other aromatic or cyclic bio-based polyols. The oligomeric polyamides can be formed by reaction of one or more diamines, which can include bio-based diamines, and one or more dicarboxylic acids, which can include bio-based dicarboxylic acids.