Preparation and characterization of some cellulose graft copolymers. Part I
| Autor: | V. Stannett, H. Yasuda, J. A. Wray |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Journal of Polymer Science Part C: Polymer Symposia. 2:387-402 |
| ISSN: | 1935-3065 0449-2994 |
| DOI: | 10.1002/polc.5070020137 |
| Popis: | Graft copolymers prepared by use of the ceric ion, uv light, mutual radiation, and preirradiation methods were: cellulose -- acrylamide; cellulose acetate -- styrene; and cellulose acetate --methyl methacrylate. Fractional precipitation and extraction methods were developed to show proof of grafting and to estimate the efficiency of the grafting process. It was shown that only a small proportion of the cellulosic chains participated in the grafting reaction under heterogeneous conditions. On the other hand, the vinyl polymer was present from 30 to nearly 100% in grafted form. The cellulose acetate-- styrene graft copolymer was isolated from the homopolymers by a fractional extraction technique and the molecular weight of the side chain determined after hydrolysis of the cellulose backbone. In general, grafts consisted of very long polystyrene side chains attached to comparatively short cellulose acetate backbone chains. The solubility behavior of such grafts was shown to be quite different from that of the corresponding physical mixtures. The graft polymers were less soluble than either of the homopolymers alone. The graft polymer was found to tolerate less cellulose acetate in a mutual solvent than the polystyrene itself. (auth) |
| Databáze: | OpenAIRE |
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