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ITS » Scientific Articles » Luar ITS
Posted by nurkhamidah@chem-eng.its.ac.id at 28/05/2013 13:50:47  •  834 Views


CRACKS AND RING BANDS OF POLY3-HYDROXYBUTYRATE ON PRECRYSTALLIZED POLYL-LACTIC ACID TEMPLATE

Author :
NURKHAMIDAH, SITI ( 198405082009122004 )
WOO, EAMOR M




ABSTRAK

The lamellar morphology cracks and ring-banded spherulites were analyzed by allowing crystallization of poly3- hydroxybutyrate PHB on previously crystallized lamellar templates of polyL-lactic acid PLLA in mixtures of two semicrystalline polymers PHBPLLA 5050 blend. PHBPLLA 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 PHBPLLA blends induces the formation of ring-banded spherulites of PLLA at lower Tc. The radial shortsegmental cracks aggregated on the circumferential bright bands occur in crystallized PHBPLLA 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



KeywordsPLLA; PHB; crack; ring band
 
Subject:  Crystallization
Date Create: 28/05/2013
Type: Text
Format: PDF
Language: English
Identifier: ITS-Article-23105130000671
Collection ID: 23105130000671
Call Number: 548.5 Nur c


Source
article of industrial & engineering chemistry research

Coverage
ITS Community

Rights
@2011 American Chemical Society




[ Download - Summary ]

ITS-Article-23105130000671-25274.pdf



[ Link of Contents]
  1. CRACKS AND RING BANDS OF POLY(3-HYDROXYBUTYRATE) ON PRECRYSTALLIZED POLY(L-LACTIC ACID) TEMPLATE
    http://pubs.acs.org/doi/abs/10.1021/ie1024547



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