7709-79-7Relevant academic research and scientific papers
Aliphatic thermoplastic polyurethane-ureas and polyureas synthesized through a non-isocyanate route
Li, Suqing,Zhao, Jingbo,Zhang, Zhiyuan,Zhang, Junying,Yang, Wantai
, p. 6843 - 6852 (2015)
A simple non-isocyanate route for synthesizing aliphatic thermoplastic polyurethane-ureas (TPUUs) and thermoplastic polyureas (TPUreas) is presented. Melt transurethane polycondensation of isophorone diamine or diethylene glycol bis(3-aminopropyl) ether with bis(hydroxyethyl) hexanediurethane, bis(hydroxyethyl) isophoronediurethane or bis(hydroxyethyl) piperazinediurethane was conducted at 170?°C under a reduced pressure of 3 mmHg. A series of thermoplastic TPUUs and TPUreas were prepared, and were characterized by gel permeation chromatography, FT-IR, 1H-NMR, differential scanning calorimetry, thermogravimetric analysis, and tensile testing. The TPUUs and TPUreas have an Mn up to 14 900 g mol-1, an Mw up to 43 700 g mol-1, Tg between -18.6?°C and 116.8?°C, and an initial decomposition temperature of over 222.3?°C. A flexible TPUU exhibits a melting temperature of 77.7?°C, a tensile strength of 6.46 MPa, and an elongation at break of 180.20%.
PROCESS FOR PRODUCING URETHANE (METH)ACRYLATES AND NEW URETHANE (METH)ACRYLATES
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Page/Page column 23, (2008/06/13)
The invention relates to urethane(meth)acrylates and to a process for their production which comprises transesterification of hydroxyalkyl carbamates with an (meth)acrylate of formula [CH2=CR29-CO-O-]t-R30 wherein R29 is hydrogen or methyl, and R30 represents an alkyl, optionally substituted by hydroxy, which may contain from 1 to 10 ether bridges group, from 1 to 10 -CO- bridges and/or from 1 to 5 -O-CO- bridges, and at least one carbonate of formula (IX) and/or a diester of formula (X) wherein each R31,each R32,each R33,each R34is, independently, chosen from the group of alkyl and aryl, and R35 is alkylene, alkenylene or arylene.
