Super-tough poly(l-lactide)/crosslinked polyurethane blends with tunable impact toughness

Abstract

Super-tough poly(l-lactide)/crosslinked polyurethane (PLLA/CPU) blends with a CPU phase dispersed in the PLLA matrix were prepared by reactive blending of PLLA with poly(ethylene glycol) (PEG), glycerol, and 4,4′-methylenediphenyl diisocyanate (MDI).

Rational design of sustainable polyurethanes from castor oil: towards simultaneous reinforcement and toughening

“…2. No absorption was observed at 2200-2300 cm −1 for all the samples, indicating that HDI was consumed completely during the two-step procedure curing process [36][37][38]. The two absorptions occurring at 1745 and 1695 cm −1 for COPU were attributed to the stretching vibration of carbonyls of ester and urethane groups, respectively [15,39].…”

Stereocomplex crystallites induce simultaneous enhancement in impact toughness and heat resistance of injection-molded polylactide/polyurethane blends

“…[11][12][13][14][15][16][17][18][19][20][21] To date, various exible polymers, such as natural rubber, 11 poly(ethyleneglycidyl methacrylate) (EGMA), 12 thermoplastic polyurethane (TPU), [13][14][15] poly(3-caprolactone) (PCL), [16][17][18] and polymerized soybean oil, 19,20 have been used for the toughening modication of PLLA. [11][12][13][14][15][16][17][18][19][20][21] To date, various exible polymers, such as natural rubber, 11 poly(ethyleneglycidyl methacrylate) (EGMA), 12 thermoplastic polyurethane (TPU), [13][14][15] poly(3-caprolactone) (PCL), [16][17][18] and polymerized soybean oil, 19,20 have been used for the toughening modication of PLLA.…”

Synthesis and structure-property relationships of biodegradable polyurethanes

“…Fourier transform infrared (FTIR) analysis suggests that interfacial compatibilization between PLLA and CPU occurs via reaction between the hydroxyl group of PLLA and the isocyanate group of MDI. The elongation at break and notched impact strength of PLLA/CPU blends were increased by up to 38 and 21 times those of neat PLLA [64]. Also, introducing flexible polymers into PLLA is considered as the most efficient way to enhance the fracture toughness of PLLA [65].…”