Morphological observations of nascent poly( p-oxybenzoate)

Observations have been made on as-polymerized, non-stirred, ‘solution’ polymerized poly( p-oxybenzoate). A uniformity of thickness of the resulting lamellae, for given polymerization conditions, indicates a nucleus determined thickness, with oligomer addition primarily on the lateral faces. Bilayere...

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Bibliographic Details
Published in:Polymer (Guilford) 1993, Vol.34 (7), p.1366-1374
Main Authors: Liu, J., Geil, P.H.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
morphology
Organic polymers
Physicochemistry of polymers
polyethylene
polymerization
Properties and characterization
Structure, morphology and analysis
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Summary:Observations have been made on as-polymerized, non-stirred, ‘solution’ polymerized poly( p-oxybenzoate). A uniformity of thickness of the resulting lamellae, for given polymerization conditions, indicates a nucleus determined thickness, with oligomer addition primarily on the lateral faces. Bilayered lamellae are the predominant form in many of the preparations, regardless of the phase I/phase II crystal modification ratio. Lack of cohesion at the interface of the layers suggests a parallel packing of the chains in these lamellae, with opposite chain direction in the two layers. A domain structure is observed in many of the lamellae and is presumed to be related to propagation of defects in phenyl ring and molecular direction on close packed planes in the two crystal forms. The presence of fibrils connecting fractured lamellae indicates some form of surface connection of neighbouring ‘extended chain’ molecules in a layer, similar to the folding of flexible molecules in lamellar crystals of, for example, polyethylene.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(93)90847-4