Accession Number : AD0861187

Title :   The Fabrication, Morphology, and Dynamic Mechanical Properties of a Model Composite System Containing in-situ Grown Filler,

Corporate Author : MONSANTO RESEARCH CORP ST LOUIS MO

Personal Author(s) : Kardos, J. L. ; McDonnell, W. L.

Report Date : JUL 1969

Pagination or Media Count : 30

Abstract : The technique of in-situ crystallization was utilized to fabricate a model composite system in which the filler morphology is variable under constant interface conditions. A butadiene-acrylonitrile copolymer was chosen as the matrix from which acetanilide was crystallized in two distinctly different crystal morphologies for filler volume loadings up to 0.35. For samples crystallized at 25 and 40C, an interlocked filler phase begins to form at a filler volume fraction which depends on the crystallization temperature. The shape of the reduced modulus-filler loading curve is extremely sensitive to interlocking. In the low volume loading region (<0.2), the 25C data can be represented with the Mooney equation which indirectly yields a filler aspect ratio in agreement with scanning electron micrographs. In general, filler interlocking causes the experimental modulus to rise significantly higher than can be predicted with existing theory. This rise is attributed to changes in the properties of the polymer matrix near and at the interface. (Author)

Descriptors :   *COMPOSITE MATERIALS), (*NITRILE RUBBER, MANUFACTURING, MECHANICAL PROPERTIES, CRYSTALLIZATION, ELECTRON MICROSCOPY, MODULUS OF ELASTICITY.

Subject Categories : Laminates and Composite Materials
      Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE