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ITS » Scientific Articles » Luar ITS
Posted by hikmatun_n@chem-eng.its.ac.id at 21/07/2016 09:26:25  •  404 Views


CONFIGURATIONAL EFFECTS ON THE CRYSTALLINE MORPHOLOGY AND AMORPHOUS PHASE BEHAVIOR IN POLY3-HYDROXYBUTYRATE BLENDS WITH TACTIC POLYMETHYL METHACRYLATE

Author :
HIKMATUN NIMAH ( 198410102009122006 )
EAMOR M.WOO




ABSTRAK

Poly3-hydroxybutyrate PHB blends with two tactic polymethyl methacrylates PMMAs isotactic polymethyl methacrylate iPMMA and syndiotactic polymethyl methacrylate sPMMA being chiraltactic 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 PHBsPMMA and PHBiPMMA blends exhibited upper critical solution temperatures of about 225 and 240C respectively on the basis of the results of thermal analysis and phase morphology. The interactions of two constituents in the blends PHBiPMMA or PHBsPMMA were measured to be insignificantly different for the PHBsPMMA and PHBiPMMA 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 PHBsPMMA blend the spherulites were all negatively birefringent and ringless when they were crystallized at any crystallization temperature between 50 and 90C. 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 sPMMAPHB blend this was not observed in the iPMMAPHB one. 2013 Wiley Periodicals Inc. J. Appl. Polym. Sci. 2013



Keywordsamorphous; biodegradable; blends; morphology; phase behavior
 
Subject:  Crystalline materials
Date Create: 18/02/2013
Type: Text
Format: PDF
Language: English
Identifier: ITS-Article-99005160010176
Collection ID: 99005160010176
Call Number: 541.395 Hik c


Source
article of journal of Applied Polymer Science

Coverage
ITS Community

Rights
journal of Applied Polymer Science




[ Download - Summary ]

ITS-Article-99005160010176-41710.pdf



[ Link of Contents]
  1. CONFIGURATIONAL EFFECTS ON THE CRYSTALLINE MORPHOLOGY AND AMORPHOUS PHASE BEHAVIOR IN POLY(3-HYDROXYBUTYRATE) BLENDS WITH TACTIC POLY(METHYL METHACRYLATE)
    http://onlinelibrary.wiley.com/doi/10.1002/app.39016/full



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