Mesomorphic Phase of Poly(butylene-2,6-naphthalate)

The mesomorphic phase of poly(butylene-2,6-naphthalate) (PBN) has been studied using wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). It was found that PBN showed a mesomorphic phase when it was rapidly quenched from the molten state to 0 °C. The mesomorphic PBN was n...

Full description

Saved in:
Bibliographic Details
Published in:Macromolecules 2008-05, Vol.41 (9), p.3157-3161
Main Authors: Konishi, Takashi, Nishida, Koji, Matsuba, Go, Kanaya, Toshiji
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The mesomorphic phase of poly(butylene-2,6-naphthalate) (PBN) has been studied using wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). It was found that PBN showed a mesomorphic phase when it was rapidly quenched from the molten state to 0 °C. The mesomorphic PBN was nearly transparent solid in appearance and its structure in WAXD scale was an intermediate one between amorphous and crystal having smectic periodicity. With increasing the temperature, a portion of amorphous remaining in the quenched PBN transformed into the mesomorphic phase above 48 °C, and then the mesomorphic phase began to transform into the α-crystal above 71 °C. We propose that the mesomorphic phase of PBN has a glass transition temperature T g meso at 65 °C besides the normal glass transition temperature T g for the isotropic glass at 41 °C.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma702383b