Cracks and ring bands of poly(3-hydroxybutyrate) on precrystallized poly(l -lactic acid) template

Siti Nurkhamidah, Eamor Woo

研究成果: Article同行評審

30 引文 斯高帕斯(Scopus)

摘要

The lamellar morphology, cracks, and ring-banded spherulites were analyzed by allowing crystallization of poly(3-hydroxybutyrate) (PHB) on previously crystallized lamellar templates of poly(l-lactic acid) (PLLA) in mixtures of two semicrystalline polymers, PHB/PLLA (50/50) blend. PHB/PLLA blends were two-step crystallized first at crystallization temperature (Tc = 115-120°C) and then cooled to ambient temperature. At Tc, only PLLA crystallized while PHB was an amorphous liquid; then at ambient temperature PHB crystallized and followed the preformed PLLA lamellar crystals. In addition, the amorphous PHB in PHB/PLLA blends induces the formation of ring-banded spherulites of PLLA at lower Tc. The radial short-segmental cracks aggregated on the circumferential bright bands occur in crystallized PHB/PLLA blends, which cannot be adequately interpreted by the temperature-induced coefficient of thermal expansion (CTE) upon cooling, but more likely they are related to interlamellar structuring of PLLA crystals at primary stage that are to be superimposed by the PHB crystals at later stage. The solvent etching of blends not only creates a valley-ridge depth profile in outer lamellar plates, but also exposes the internal branched crystals underneath the bright band (ridge after etching), which are housed underneath the concave portion of lamellae with lenticular-shaped radial cracks. PHB and PLLA in crystallized blends are intermixed in the dark bands, and these two lamellae also are interwound as radial bundles in the bright bands.

原文English
頁(從 - 到)4494-4503
頁數10
期刊Industrial and Engineering Chemistry Research
50
發行號8
DOIs
出版狀態Published - 2011 四月 20

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 化學工程 (全部)
  • 工業與製造工程

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