Abstract
A method is proposed for determination of the degree of crystallinity of transparent elastomers based on simultaneous measurement of the stress δ and the birefringence Δn during stepwise (I) and continuous (II) stretching of the sample. It was shown that the value of Δn may be divided into additive components of birefringence in amorphous Δna and crystalline Δnk phases in regime I. This permits calculation of ω for stretching in regime II. The dependence of ω on the degree of stretching in regimes I and II up to break are given for the example of a peroxide vulcanizate of natural rubber. Estimation of the relative error of measurement shows that the greatest precision is attained for deformation close to the breaking point.
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