Researches in the field of the grafting on cellulose with acrylic and methacrylic derivatives

Simionescu, Christofor I.; Oprea, Spiridon

doi:10.1002/polc.5070370115

Cited by 10 publications

References 12 publications

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Thermal behavior of cotton grafted with vinyl monomers individually and in mixture compositions

Sharma¹,

Daruwalla

1977

J of Applied Polymer Sci

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SynopsisThermal analysis of cotton samples grafted with acrylamide, acrylonitrile, methyl acrylate, and methyl methacrylate individually and in mixture compositions has been carried out. Additional endothermic peaks in the DTA curves characteristic of the polymers grafted were observed. Graft copolymerization of acrylamide and acrylonitrile makes cotton thermally more stable, while in the case of methyl acrylate-and methyl methacrylate-grafted cottons, the initial decomposition starts a t higher temperatures, but subsequent decomposition is faster and the overall thermal stability is lowered. In the case of binary mixtures of acrylamide and acrylonitrile, inception of decomposition starts earlier, but subsequent decomposition takes place a t much higher temperatures than for individual monomer-grafted cottons. Interaction between monomers during grafting is indicated. When fabric samples containing polyacrylamide grafts are methylolated and subsequently crosslinked, there is a reduction in the thermal stability of the treated cotton.

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Thermal behavior of cotton grafted with vinyl monomers individually and in mixture compositions

Sharma¹,

Daruwalla

1977

J of Applied Polymer Sci

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Peroxy radicals produced in polypropylene through oxidation with ozone

1977

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Preirradiated polymers react with some conjugated monomers like methyl methacrylate or styrene. The graft polymerization is considered to be a radical process, and the presence of the radicals was unambiguously confirmed by electron spin resonance (ESR) observation. ESR studies of irradiation oxidation of polypropylene have been developed in detail, one of the most interesting problems being the effect of oxygen on the primary radicals formed'). Quite stable peroxy radicals can easily be produced after the admission of oxygen to preirradiated polymers. On the other hand, graft polymerization is attainable by the method of the thermal decomposition of the hydroperoxide and peroxide groups, created by the treatment of polymers with ozone at room temperature". Polypropylene oxidized with ozone reacts with some conjugated monomers at 7G8O0C3'. The radicals produced in this graft polymerization process have so far rarely been detected or identified. Their detection and identification will be described in this paper. Experimental PartThe ESR measurements were carried out using a conventional X-band ESR spectrometer of "JES-ME3X" type with 100 KHz field modulation.The sample of fibrous polypropylene was filled in a quartz tube, 10mm in diameter, which was inserted in the ESR cavity. An ozone current was introduced into the quartz tube during the ESR measurements. The ESR signals increased rapidly at the beginning and then gradually. When the admission of ozone was broken off, the intensities of the ESR signals were reduced to some extent. Immediately after stopping the ozone treatment, the polypropylene fiber was enclosed in a quartz sample tube, 3mm in diameter, which was supplied for the ESR measurements at liquid nitrogen temperature. The radicals were found to be indefinitely stable at 77 K. Results and DiscussionThe ESR spectra obtained are depicted in Fig. 1. The lineshapes with no hyperfine structure are quite asymmetric and the anisotropic features in the ESR spectra become more obvious at 77 K. These may be because motional averaging is stopped at low temperatures. The theory for a random orientation of radicals with a cylindrical symmetric g tensor developed by Kneubiih14) gives values of g//=2,0317, and g1 =2,00967*) at room temperature and those *) The subscripts // and 1 refer to the relative orientations of the directions of the applied magnetic field and the symmetric axis of the free electron distribution.

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Radiation‐induced graft copolymerization of mixtures of styrene and acrylamide onto cellulose acetate. I. Effect of solvents

Bhattacharyya

Maldas

1982

J. Polym. Sci. Polym. Chem. Ed.

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SynopsisAcrylamide, styrene, and mixtures of acrylamide and styrene were grafted onto cellulose acetate film. The permeabilities of sodium chloride and sodium sulfate through the ungrafted and grafted cellulose acetate films were studied. Permeability increases with the increase in the extent of grafting of acrylamide; whereas it decreases with the increase in the extent of grafting of styrene onto cellulose acetate. The same trend in permeability was observed when cellulose acetate was grafted with the binary monomer mixture. Permeability is also found to depend on the nature of the solute dissolved in water. The results were discussed in terms of free volume concept of the water-swollen films.

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Researches in the field of the grafting on cellulose with acrylic and methacrylic derivatives

Cited by 10 publications

References 12 publications

Thermal behavior of cotton grafted with vinyl monomers individually and in mixture compositions

Thermal behavior of cotton grafted with vinyl monomers individually and in mixture compositions

Peroxy radicals produced in polypropylene through oxidation with ozone

Radiation‐induced graft copolymerization of mixtures of styrene and acrylamide onto cellulose acetate. I. Effect of solvents

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