Hydrolysis of regenerated celluloses under suitable conditions and after suitable pretreatments leads to well defined x-ray diffraction patterns compared to the poorly defined patterns of the parent samples. X-ray diffraction diagrams obtained after hydrolysis indicate clearly that regenerated celluloses contain an extraneous lattice in addition to cellulose II. The major extraneous lattice in normal viscose and high wet modulus rayon is cellulose I, while that in high tenacity rayon is cellulose IV.
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