ISSN:
0887-624X
Keywords:
poly(p-phenylenebenzobis(thiazole))
;
poly(p-phenylenebenzobis(oxazole))
;
film
;
molecular composite
;
benzocyclobutene
;
phase separation
;
interlayer integrity
;
tensile strength
;
tensile modulus
;
delamination resistance
;
film density
;
coefficient of thermal expansion
;
thermal stability
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Films consisting of a rigid-rod polymer and thermoset resin matrixes were prepared. Poly{(benzo[1,2-d : 5,4-d′]bis(oxazole-2,6-diyl))-1,4-phenylene} (PBO) in polyphosphoric acid (PPA) was blended with 2,6-bis(4-benzocyclobutene) benzo[1,2-d : 5,4-d′]bis(oxazole) (1), and films were extruded from these solutions. The coagulated films were soluble in methanesulfonic acid (MSA). After heat treatment at 300°C, the films became insoluble in MSA. Crosslinked films were homogeneous and did not show phase segregation between the two components. These were composite films at the molecular level. Transmission electron microscopy (TEM) showed enhanced interlayer integrity and reduced microfibril separation for the molecular composite films as compared to normal PBO film. These films had significantly better torsion and tension delamination resistance. The incorporation of a second component did not sacrifice the tensile properties of PBO film. Thermal stability of these composite films was only slightly lower than that of normal PBO film. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 2157-2165, 1997
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
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