Tough conetworks composed of 4-armed star-shaped oligomers of l-lactide, d-lactide and ɛ-caprolactone

Shibita, Ayaka; Shimasaki, Toshiaki; Teramoto, Naozumi; Shibata, Mitsuhiro

doi:10.1007/s00289-017-2154-4

Cited by 2 publications

(1 citation statement)

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“…Among all the networks, SPN-5scLAO/3CLOs 75/25 and 50/50 exhibited the highest and second highest tensile toughnesses (21.4 and 20.3 MJ·m −3 ), respectively. We have already reported that the maximal tensile toughness and strength optimized for the conetworks (PEPN-4scLAO/4CLOs) prepared by the reactions of pentaerythritol-based 4-armed star-shaped LLA, DLA and CL with HDI were 25.8 MJ·m −3 and 18.5 MPa [44]. Although the tensile toughness of SPN-5scLAO/3CLO 75/25 was a little lower than that of PEPN-sc4LAO/4CLO 75/25, the tensile strength (28.8 MPa) of the former sample was much higher than that (18.5 MPa) of the latter sample.…”

Section: Thermal and Mechanical Properties Of Spn-msclao/3closmentioning

confidence: 99%

Stereocomplexation, Thermal and Mechanical Properties of Conetworks Composed of Star-Shaped l-Lactide, d-Lactide and ε-Caprolactone Oligomers Utilizing Sugar Alcohols as Core Molecules

et al. 2017

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Abstract:It is important to develop tailor-made biodegradable/biocompatible polymer networks usable for biomaterials whose thermal and mechanical properties are easily controlled by changing the composition. We synthesized sugar-alcohol-based polymer networks (SPN-mscLAO/3CLO, m = 4, 5 or 6) by the crosslinking reactions of erythritol, xylitol or sorbitol-based m-armed star-shaped L-lactide and D-lactide oligomers (HmSLLAO and HmSDLAO), a glycerol-based 3-armed star-shaped ε-caprolactone oligomer (H3SCLO) and hexamethylene diisocyanate (HDI) at the weight ratios of HmSLLAO/HmSDLAO = 1/1 and (HmSLLAO + HmSDLAO)/H3CLO = 100/0, 75/25, 50/50, 25/75 or 0/100). The influence of the arm number on the crystallization behavior, thermal and mechanical properties of SPN-mscLAO/3CLOs were systematically investigated by comparing with those of sugar-alcohol-based homochiral polymer network (SPN-mLLAO, m = 4, 5 or 6) prepared by the reaction of HmSLLAO and HDI. Stereocomplex (sc) crystallites are dominantly formed for SPN-mscLAO/3CLOs 100/0-25/75, whereas SPN-mLLAOs were amorphous. The higher order of melting temperature of sc-crystals for SPN-mscLAO/3CLOs 100/0-25/75 was m = 5 > m = 6 > m = 4. The sc-crystallinities of SPN-4scLAO/3CLOs 100/0-50/50 were significantly lower than those of SPN-mscLAO/3CLOs 100/0-50/50 (m = 5 and 6). The larger order of the sc-spherulite size at crystallization temperature of 110 • C was m = 5 > m = 6 > m = 4 for SPN-mscLAO/3CLO 100/0. The size and number of sc-spherulites decreased with increasing crystallization temperature over the range of 110-140 • C and with increasing CLO fraction. Among all the networks, SPN-5scLAO/3CLOs 75/25 and 50/50 exhibited the highest and second highest tensile toughnesses (21.4 and 20.3 MJ·m −3 ), respectively.

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Section: Thermal and Mechanical Properties Of Spn-msclao/3closmentioning

confidence: 99%