Blending polysaccharides with biodegradable polymers. I. Properties of chitosan/polycaprolactone blends

Dunia M. García Cruz, José L. Gomez Ribelles, Manuel Salmerón Sánchez

研究成果: ジャーナルへの寄稿学術誌査読

50 被引用数 (Scopus)

抄録

Blends of polycaprolactone (PCL) and chitosan (CHT) were prepared by casting from a solution. CHT and PCL were dissolved by using acetic acid/water mixtures. Both solutions were slowly mixed to cast blend films containing 10%, 20%, 30%, and 40% by weight of CHT. PCL and CHT form phase separated blends. The phase morphology is in large extent controlled by the casting procedure. Even if casting of the film starts from a clear solution, the solvent composition determines the form in which phase separation takes place and consequently the morphology of the resulting blend after solvent evaporation. The blend containing 20% CHT presents cocontinuous phases. The sample presents a high elastic modulus even at temperatures above melting of PCL. Blends with higher CHT contents consist of disperse PCL domains in a CHT matrix and the contrary occurs in the blend containing 10% CHT in which disperse CHT domains with a network morphology appear inside the spherulites of PCL. In all the blends, the nucleation effect of CHT accelerates the crystallization of PCL from the melt, although in the blends with high CHT contents a part of the PCL mass included in large domains might not be affected by the presence of CHT. The sample containing 20% CHT has a peculiar behavior with respect to the crystallization of PCL, only a small part of PCL crystallizes in isothermal treatments although this fraction crystallizes faster than in the rest of the blends.

本文言語英語
ページ(範囲)303-313
ページ数11
ジャーナルJournal of Biomedical Materials Research - Part B Applied Biomaterials
85
2
DOI
出版ステータス出版済み - 5月 1 2008
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 生体材料
  • 生体医工学

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