Structures and properties of polycarbonate modified polyether‐polyurethanes prepared by transurethane polycondensation

Abstract

Thermoplastic polycarbonate modified polyether-polyurethane (PEPU) elastomers were prepared by transurethane polycondensation method using poly(oxytetramethylene) glycol of M n 5 2000 and dimethyl-hexane-1,6-dicarbamate as the main raw materials, 1,4-butanediol as a chain extender and polycarbonate diol (PCDL) as an additive in the presence of dibutyltin oxide as a catalyst. The effect of the PCDL on the PEPUs' structure, intrinsic viscosity, molecular weight, mechanical, optical, and thermal properties, and water resistance were studied. The polycarbonate modified PEPUs showed better mechanical and thermal properties, but lower molecular weight and optical properties than the PEPUs. The PEPUs modified by PCDL1000 exhibited better performance, including mechanical, optical, and thermal properties, than those by PCDL2000.

Nonisocyanate CO2-Based Poly(ester-co-urethane)s with Tunable Performances: A Potential Alternative to Improve the Biodegradability of PBAT

“…Bis-hydroxycarbamates are formed from the ring-opening reaction of 5-membered cyclic carbonate and diamines, which is well developed by Zhao’s group for the synthesis of a series of poly­(ether urethane)­s and poly­(amide urethane)­s. − Bis-alkylcarbamates are usually produced from aminolysis of diamines and dimethyl carbonate (DMC). Deepa et al employed various simple bis-alkylcarbamates with diversified diols to synthesize NIPUs by melt polycondensation. , Reacting aliphatic bis-alkylcarbamates with polycarbonate diols, − polyether diols, , or other diols , to endow polymers with some desirable properties has been extensively studied. In the aforementioned method to construct bis-alkylcarbamates, incorporation of CO 2 , a sustainable and naturally abundant carbon source, is a meaningful and feasible practice to prepare isocyanate-free feedstock for polyurethane.…”

Poly(ionic liquid)s-based polyurethane blends: effect of polyols structure and ILs counter cations in CO2 sorption performance of PILs physical blends

“…5). The first thermal event (T onset1 ) is related to the hard polyurethane segment breaking urethane bonds [7,38,65,66]. The second thermal event is commonly associated with polyol (PC or PG).…”

Nonisocyanate thermoplastic polyurethane elastomers based on poly(ethylene glycol) prepared through the transurethanization approach

“…Furthermore, neither the self‐polymerization of DCs nor back‐biting side reactions are observed. However, when Ti(OBu) 4 or dibutyltin oxide are used as catalysts, the reaction needs a high temperature and a vacuum to occur. Thus, the polymers synthesized from reactions 1 and 2 could not have the same chemical structures (Scheme ).…”

“…The heating of acyl azide groups causes the in situ formation of isocyanate groups via Curtius rearrangement Transurethane polycondensation, particularly the one with the reaction between dimethyl dicarbamates (DCs) and diols in the presence of a catalyst, namely, 1,5,7‐triazabicyclo[4.4.0]dec‐5‐ene (TBD) …”