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ITS » Scientific Articles » Luar ITS
Posted by hikmatun_n@chem-eng.its.ac.id at 01/09/2016 13:02:21  •  597 Views


DENDRITIC MORPHOLOGY COMPOSED OF STACKED SINGLE CRYSTALS IN POLYETHYLENE SUCCINATE MELT-CRYSTALLIZED WITH POLYP-VINYL PHENOL

Author :
HIKMATUN NIMAH ( 198410102009122006 )
EAMOR M.WOO




ABSTRAK

Dendritic morphology with stacked single crystals of polyethylene succinate PESu melt-crystallized in the presence of amorphous polyp-vinyl phenol PVPh were observed and analyzed using optical microscopy OM atomic force microscopy AFM and transmission electron microscopy TEM. At higher temperatures the fluffy dendritic morphology was a transition in melt-crystallized PESuPVPh from originally compact crystals at lower crystallization temperature. The addition of amorphous and strongly interacting PVPh polymer confinement in thin films and high crystallization temperature were considered as the main factors of the crystals transition from compact crystals to dendritic crystals. Single crystals of PESu were proven by AFM in the PESuPVPh blend especially when confined in films of above 500 nm melt-crystallized at Tc 70 C or above. The electron diffraction pattern of TEM result further confirmed the formation of PESu single crystals. The combination of thin film thickness high crystallization temperature and strong interaction between two polymers were believed to be the main factors for melt-crystallized PESu single crystals. In the single crystals with spiral arrays the PESu chains though achiral tend to exhibit paired-up crystal entities resembling identical twins but with opposite helical directions. The single-layer thickness is almost equal between the paired-up lozenge lamellae screwing clockwise or counterclockwise. The PESu single crystals in PESuPVPh blend were melt-grown and electron diffraction patterns proven in this study are in agreement with the literature for neat PESu single crystals grown in dilute solutions.



KeywordsDendrite; Single Crystals; PESu; Morphology
 
Subject:  Crystals
Date Create: 13/12/2013
Type: Text
Format: PDF
Language: English
Identifier: ITS-Article-99005160010179
Collection ID: 99005160010179
Call Number: 530.429 Hik d


Source
article of American Chemical Society

Coverage
ITS Community

Rights
American Chemical Society




[ Download - Summary ]

ITS-Article-99005160010179-41778.pdf



[ Link of Contents]
  1. DENDRITIC MORPHOLOGY COMPOSED OF STACKED SINGLE CRYSTALS IN POLY(ETHYLENE SUCCINATE) MELT-CRYSTALLIZED WITH POLY(P-VINYL PHENOL)
    http://pubs.acs.org/doi/abs/10.1021/cg401413f



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