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Poly(l-lactic acid)(PLLA) is a kind of semi-crystalline polymers that could be hydrolyzed through hydrolytic scission of the ester groups. Because of its biocompatibility and biodegradability, it is used widely in medical applications, which degradation and change in mechanical properties during hydrolyzing were the key factors. A.C. Renouf-Glauser et al. had investigated the effect of crystallinity...
Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (P3HB-co-3HV) is a promising semi-crystalline biodegradable polymer that may be used for a wide range of medical applications. Prior investigations were focused on the effect of hydrolysis and enzyme degradation, but few studies focused on the deformation mechanism of thin films. In this study we aim to reveal how the spherulites were deformed and to investigate...
A new technique using contact mode atomic force microscopy is developed for probing the elastic properties of deformed material within the microscopic deformation zones in glassy polymers. By measuring the difference in local deflection to the contact force, the ratios of Young's moduli of the matter inside the zone to that outside the zones were determined. Young's modulus was found to decrease significantly...
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