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In this work, a series of high performance bio-based polyurethanes(bio-PUs) were synthesized from polylactide(PLA)-based diols, different diisocyanates(TDI, MDI, HDI, IPDI) and chain extender 1,4-butanediol, in which different soft and hard segments are used to adjust their transition temperatures and mechanical properties. Poly(lactide-co-caprolactone)copolymer diols(co-PLAols) instead of PLA diols as the soft segment improved the thermal stability and mechanical properties of the synthesized bio-PUs. Among them, MDI-based bio-PUs have the highest T_g(43.8 °C), tensile strength(23.5 MPa) and modulus(380.8 MPa), while HDI-based bio-PUs have the lowest T_g(21.4 °C) and highest elongation at break(580%). Especially, the bio-PUs synthesized from co-PLAols and MDI demonstrate better mechanical properties,closed to petroleum-based commodities. Furthermore, the obtained bio-PUs display good shape memory properties at body temperature and cytocompatibility. Therefore, these bio-PUs are promising for applications in biomedical fields.
In this work, a series of high performance bio-based polyurethanes (bio-PUs) synthesized from polylactide (PLA) -based diols, different diisocyanates (TDI, MDI, HDI, IPDI) and chain extender 1,4-butanediol, in which different soft and hard segments are used to adjust their transition temperatures and mechanical properties. Poly (lactide-co-caprolactone) copolymer diols (co-PLAols) instead of PLA diols as the soft segment improved the thermal stability and mechanical properties of the synthesized Bio-PUs. Among them, MDI-based bio-PUs have the highest T_g (43.8 ° C), tensile strength (23.5 MPa) and modulus (380.8 MPa) Especially, the bio-PUs synthesized from co-PLAols and MDI demonstrated better mechanical properties, closed to petroleum-based commodities. body temperature and cytocompatibility. Thus, these bio-PUs are prom ising for applications in biomedical fields.