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Title: Sol Gel Studies on Chemically Modified Celluloses
Authors: Pandey, S. N.
Nair, Prema
Issue Date: Dec-1976
Publisher: NISCAIR-CSIR, India
Abstract: A sol gel study has been made on chemically modified crosslinked cotton cellulose. The gross effectiveness 01 crosslink development in formaldehyde cottons in different processes has been evaluated by measuring the sol gel fraction. Cellulose samples were crosslinked by different processes (Form W and Form D) for different periods and sol gel studies of these samples were carried out in cupriethylenediamine solvent. Data on formaldehyde content showed gradual increase with increase in reaction period for Form Wand Form D processes. The formaldehyde uptake was higher in samples treated by Form D process compared to that in the case of samples treated by Form W process. Samples treated with NaOH and ZnCl2 showed a higher degree of crosslinking for both processes compared to the samples treated with H2PO4 and H2SO4. This is attributed to increase in the number of accessible sites in cellulose in NaOH and ZnCl2 treated samples. Sol gel data showed a similar trend as in the case of formaldehyde content for both Form W and Form D processes. Sol gel data indicate that Form W process is more efficient in transferring the fibre structure into an insoluble network than Form D process. A relationship between the moles of CH2O/GPU in crosslinked cellulose and gel fraction is indicated.
Page(s): 115-119
ISSN: 0975-1025 (Online); 0971-0426 (Print)
Appears in Collections:IJFTR Vol.01(4) [December 1976]

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