ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Many applications of rubberlike materials require a combination of bulk and surface properties which may not be attained with a specific elastomeric composition regardless of vulcanization, reinforcement, or other modification by compounding, but may be achieved by combining two materials in a laminated structure. This paper describes a technique for casting hollow laminated elastomeric structures from aqueous dispersions in molds of plaster of Paris. An elastomeric composition which has the properties required of the surface is deposited first, and a second composition having the properties required of the bulk is then cast against original film before the latter dries in the mold. This process, termed “dilaminar” film casting, yields laminated films having resistant surface layers of uniform, controllable thickness that are inherently bound to the substrate. The properties of a series of butyl acrylate-acrylonitrile copolymers of varying monomer ratios and amounts of organic reinforcing agents were studied. It was found that unreinforced copolymers of approximately 27-30% acrylonitrile had suitable resistance to staining and abrasion, while reinforced compositions of an elastomer copolymer having an acrylonitrile content of about 10% displayed optimum bulk but poor surface properties. Dilaminar films were cast of two compositions having optimum properties for surface and substrate layers. The laminated films retained the surface resistance of the outer laminare and exhibited mechanical properties intermediate between the properties of the two components. Equations relating tensile and flexural properties of laminated elastomeric films to those of the single homogeneous compositions were derived, and calculated tensile and flexural values were found to agree with the experimental data.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1956.120209504
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