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ITS » Scientific Articles » Luar ITS
Posted by hikmatun_n@chem-eng.its.ac.id at 01/09/2016 13:39:59  •  594 Views


ANISOTROPIC NUCLEATION AND JANUS-FACED CRYSTALS OF POLYL-LACTIC ACID INTERACTING WITH AN AMORPHOUS DILUENT

Author :
EAMOR M.WOO ( none )
HIKMATUN NIMAH   YU HSIANG WANG




ABSTRAK

Atomic-force microscopic and X-ray techniques were applied to reveal and analyze uniquely three types of distinctly different crystals including a Janus-face composite type of spherulites in LMw-PLLA induced by mixing with aPMMA 20 wt . One type Type-1 is completely packed by fibrous lamellae while the second type Type-2 is completely packed by flat-on platelet crystals and the third type a dual-faced i.e. Janus-faced Type-3 spherulite with two distinguished patterns filling the composite spherulites perpendicular quadrants that is originated from sheaf-like directional growth from nuclei to pack into fibrous lamellae while the perpendicular growth was diffusion-drained leading to thinner flat-on platelets. The Janus-face spherulite type half-and-half fibrous lamellae and flat-on platelets became more significant only when the 8020 mixtures were melt-crystallized at Tc 110115 C. That is existence of Type-3 Janus-faced spherulite is composition- and temperature-selective for favorable nucleation and growth. Mechanisms leading to such diversified patterns and Janus-face spherulites in the LMw-PLLAaPMMA blend were probed.



KeywordsPLLA; aPMMA; dual-faced spherulites; lamellae habit
 
Subject:  Crystals
Date Create: 27/05/2014
Type: Text
Format: PDF
Language: English
Identifier: ITS-Article-99005160010180
Collection ID: 99005160010180
Call Number: 530.429 Eam a


Source
article of Industrial & Engineering Chemistry Research

Coverage
ITS Community

Rights
© 2014 American Chemical Society




[ Download - Summary ]

ITS-Article-99005160010180-41779.pdf



[ Link of Contents]
  1. ANISOTROPIC NUCLEATION AND JANUS-FACED CRYSTALS OF POLY(L-LACTIC ACID) INTERACTING WITH AN AMORPHOUS DILUENT
    http://pubs.acs.org/doi/abs/10.1021/ie501470a



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