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Alkaline treatments to render starch-based biodegradable polymers self-minerali...
Leonor, I. B.; Kim, H-M; Balas, F.; Kawashita, M.; Reis, R. L.; Kokubo, T.; Nakamura, T.The present research aims to develop a new route for surface functionalization of biodegradable polymers. The method is based on a wet chemistry modification, resulting in etching and/or hydrolysis in order to increase the amount of polar groups, such as hydroxyl (--OH) and carboxylic (--COOH) groups on the surface of the polymer. The polymer used as substrate was a corn starch-ethylene vinyl alcohol biodegrada...
Functionalization of different polymers with sulfonic groups as a way to coat t...
Leonor, I. B.; Kim, H-M.; Balas, F.; Kawashita, M.; Reis, R. L.; Kokubo, T.; Nakamura, T.Covalent coupling of sulfonic group (–SO3H) was attempted on different polymers to evaluate efficacy of this functional group in inducing nucleation of apatite in body environment, and thereupon to design a simple biomimetic process for preparing bonelike apatite-polymer composites. Substrates of polyethylene terephthalate (PET), polycaprolactam (Nylon 6), high molecular weight polyethylene (HMWPE) and ethylene...
Surface potential change in bioactive polymer during the process of biomimetic ...
Leonor, I. B.; Kim, H-M; Balas, F.; Kawashita, M.; Reis, R. L.; Kokubo, T.; Nakamura, T.A bioactive polyethylene substrate can be produced by incorporation of sulfonic functional groups (-SO3H) on its surface and by soaking in a calcium hydroxide saturated solution. Variation of the surface potential of the polyethylene modified with -SO3H groups with soaking in a simulated body fluid (SBF) was investigated using a laser electrophoresis zeta-potential analyzer. To complement the study using laser ...
Formation of bone-like apatite on polymeric surfaces modified with -SO3H groups
Leonor, I. B.; Kim, H-M; Balas, F.; Kawashita, M.; Reis, R. L.; Kokubo, T.; Nakamura, T.Sulfonic groups (-SO3H) were covalently attached on different polymeric surfaces enabling them to induce apatite nucleation, for developing bioactive apatite-polymer composites with a bonelike 3-dimensional structure. High molecular weight polyethylene (HMWPE) and ethylene-co-vinyl alcohol co-polymer (EVOH) were used. The polymers were soaked in two types of sulphate-containing solutions with different concentr...
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