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Generation of Three-Dimensional Structures by Crystal/Crystal Coalescence of Poly-Para-Xylylene in Solution

Published online by Cambridge University Press:  28 February 2011

Philippe Pradere  and
Edwin L. Thomas
Philippe Pradere
Affiliation:
Dept. of Polymer Science and Engineering, University of Massachusetts, Amherst MA 01003.
Edwin L. Thomas
Affiliation:
Dept. of Polymer Science and Engineering, University of Massachusetts, Amherst MA 01003.
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Summary:

Among the two basic poly-para-xylylene (PPX) crystal habits corresponding to the well known alpha and beta polymorphs, various forms of crystal/crystal associations have been observed and explained in term of three-dimensional structures. High resolution imaging and electron diffraction experiments of lamellar crystals grown from a 0.01% wt solution in 1-methylnaphthalene using the self seeding technique show strong evidence for a threedimensional “roof-like” model for the alpha/alpha twinned crystals. This model is based on the presence of tilted chains in the alpha lamellar crystals. Furthermore, observation of various forms of alpha/alpha, alpha/beta and beta/beta lamellar crystals allows a generalization of this model and a more fundamental explanation for their origin: crystal coalescence during growth in solution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 138: Symposium Q – Characterization of the Structure and Chemistry of Defects in Materials , 1988 , 485
Copyright
Copyright © Materials Research Society 1989

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