Journal
POLYMERS
Volume 15, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/polym15153209
Keywords
biodegradation; double metal cyanide catalyst; polycaprolactone polyol; poly(ester ester); thermoplastic elastomer
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Researchers synthesized α,ω-hydroxyl-terminated polycaprolactone (PCL) polyols and used them as soft segments to produce thermoplastic poly(ester ester) elastomers. Compared to conventional thermoplastic poly(ether ester) elastomers, the PCL-based TPEs exhibited superior mechanical properties and biodegradability. This study demonstrates significant potential for producing biodegradable TPEs with better properties than polyether-derived elastomers.
Thermoplastic elastomers (TPEs) have attracted increasing attention for a wide variety of industrial and biomedical applications owing to their unique properties compared to those of traditional rubbers. To develop high-performance engineering TPEs and reduce the environmental pollution caused by plastic waste, & alpha;,& omega;-hydroxyl-terminated polycaprolactone (PCL) polyols with molecular weights of 1000-4200 g mol(-1) and polydispersity index () of 1.30-1.88 are synthesized via the ring-opening polymerization of sustainable & epsilon;-caprolactone using a heterogeneous double metal cyanide catalyst. The resulting PCL polyols are employed as soft segments to produce thermoplastic poly(ester ester) elastomers and are compared to conventional thermoplastic poly(ether ester) elastomers prepared from polytetramethylene ether glycol (PTMEG). Notably, the PCL-based TPEs exhibit superior mechanical properties and biodegradability compared to PTMEG-based TPEs owing to their crystallinity and microphase separation behaviors. Accordingly, they have 39.7 MPa ultimate strength and 47.6% biodegradability, which are much higher than those of PTMEG-based TPEs (23.4 MPa ultimate strength and 24.3% biodegradability). The introduction of biodegradable PCLs demonstrates significant potential for producing biodegradable TPEs with better properties than polyether-derived elastomers.
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