Configurational effects on the crystalline morphology and amorphous phase behavior in poly(3-hydroxybutyrate) blends with tactic poly(methyl methacrylate)

Hikmatun Ni'Mah, Eamor Woo

研究成果: Article

1 引文 斯高帕斯(Scopus)

摘要

Poly(3-hydroxybutyrate) (PHB) blends with two tactic poly(methyl methacrylate)s [PMMAs; isotactic poly(methyl methacrylate) (iPMMA) and syndiotactic poly(methyl methacrylate) (sPMMA)], being chiral/tactic polymer pairs, were investigated with regard to their crystalline spherulite patterns, optical birefringence, and amorphous phase behavior with polarized optical microscopy and differential scanning calorimetry. The PHB/sPMMA and PHB/iPMMA blends exhibited upper critical solution temperatures of about 225 and 240°C, respectively, on the basis of the results of thermal analysis and phase morphology. The interactions of two constituents in the blends (PHB/iPMMA or PHB/sPMMA) were measured to be insignificantly different for the PHB/sPMMA and PHB/iPMMA blends. However, syndiotacticity in PMMA exerted a prominent effect on the alteration of the PHB spherulite morphology, whereas, by contrast, isotacticity in PMMA had almost no effect at all. At high sPMMA contents (e.g., 30 wt %) in the PHB/sPMMA blend, the spherulites were all negatively birefringent and ringless when they were crystallized at any crystallization temperature between 50 and 90°C. That is, not only was the original ring-banded pattern in the neat PHB spherulites completely disrupted, but the optical sign was also reverted completely from positively to negatively birefringent in the sPMMA/PHB blend; this was not observed in the iPMMA/PHB one.

原文English
頁(從 - 到)3113-3125
頁數13
期刊Journal of Applied Polymer Science
129
發行號6
DOIs
出版狀態Published - 2013 九月 15

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

指紋 深入研究「Configurational effects on the crystalline morphology and amorphous phase behavior in poly(3-hydroxybutyrate) blends with tactic poly(methyl methacrylate)」主題。共同形成了獨特的指紋。

  • 引用此