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Grafting of polyethylenimine onto mesylated cellulose acetate polymethyl methacrylate and polyvinyl chloride


, : Grafting of polyethylenimine onto mesylated cellulose acetate polymethyl methacrylate and polyvinyl chloride. Carbohydrate Polymers 12(3): 323-328

Work on the formation of graft copolymers of cellulose derivatives has been continued by grafting poly(ethylenimine) (PEI) onto mesylated cellulose acetate (MCA) by second order nucleophilic displacement (SN2) of mesylate groups by amine groups. Three solutions each containing 5% MCA and 2.5, 5 and 10% PEI, respectively, in dimethylformamide (DMF) were reacted at 80.degree. C. The first solution did not form a gel, while the others formed gels (since cross-linking occurs) in 3 h and 1.5 h, respectively. This indicates aminolysis of acetate groups was taking place preferentially to the SN2 reaction. Reaction of PEI with poly(methyl methacrylate) (PMMA) led to gelation, indicating that aminolysis of ester groups was occurring even with the 'hindered' esters of PMMA. The nucleophilic reaction leading to grafting was demonstrated by reaction of PEI with poly(vinyl chloride) (PVC), which also led to gelation. These grafting reactions could be used to produce cross-linked resins with high ion-exchange capacity.

US$19.90

DOI: 10.1016/0144-8617(90)90073-2


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Okada, Y.; Kumagai, H.; Morikawa, Y.; Akasawa, A., 2016: Epidemiology of pediatric allergic diseases in the Ogasawara Islands. The Ogasawara Islands, away from mainland Japan, belong to a subtropical area. Although the daily eating habits and food are relatively similar to that on the mainland, the living environment is quite different. The prevalence of allergic diseases...

Kruger E.J.; Polling L., 1984: 1st attempts at artificial breeding and larval rearing of the butter catfish eutropius depressirostris schilbeidae pisces. E. depressirostris is endemic to Southern Africa. As a 1st attempt to domesticate this species, experiments on artificial propagation were undertaken. Successful stripping of eggs was achieved after a course of injections comprising of human chori...

Phillips, W.H.; Dirion, J.K.; Graves, G.O., 1932: Congenital bilateral palsy of the abducens. A girl 5 yrs. old died under gas-ether just as a bilateral resection of the lateral rectus was completed for congenital nonconcomitant convergent strabismus. Autopsy showed a 36-gm. thymus extending considerably below the auriculo-ventricular line...

Johansson M.E.; Keddy P.A., 1991: Intensity and asymmetry of competition between plant pairs of different degrees of similarity an experimental study on two guilds of wetland plants. Using predictions from existing competition theory, we designed an experiment to test if competition intensity or asymmetry varied with the similarity of the interacting plants. Competition intensity and asymmetry were measured after one growing s...

Crandell, Ra, 1976: Summary of IPPA field studies on use of porcine hyperimmune serum. Proceedings annual meeting: 0th 90-91

Sovner, 1996: Behavioral and Affective Disturbances in Persons With Mental Retardation-A Neuropsychiatric Perspective: Preface. Seminars in Clinical Neuropsychiatry 1(2): 90-93

Rok, S.; Wytrazek, M.; Bilski, B., 2005: Efficacy of therapeutic exercises in low back pain surveyed in a group of nurses. The aim of the survey was to analyze the efficacy of therapeutic exercises in a selected group of nurses and to show the interest of nurses in kinesitherapy as a method for preventing back pain complaints. A questionnaire survey covered a group of...

Mondragon Jacobo, C., 2002: Preliminary identification of apomictic seedlings Opuntia spp. breeding populations from Central Mexico. Opuntia is endemic to Mexico but it is becoming an interesting alternative fruit and forage crop for other semiarid areas of the world. Few cultivars originating from the Mexican germplasm support the world market. Nopal is propagated asexually fo...

Wadden, K.; Brown, K.; Maletsky, R.; Boyd, L.A., 2013: Correlations between brain activity and components of motor learning in middle-aged adults: an fMRI study. Implicit learning may be shown by improvements in motor performance, which occur unconsciously with practice and are typically restricted to the task that was practiced. The purpose of this study was to examine behaviorally relevant brain activati...

Kunze, P.Boschek, C.B., 1968: Elektronenmikroskopische Untersuchung zur Form der achten Retinulazelle bei Ocypode. Zeitschrift fuer Naturforschung, 23B 568