2 edition of Radiation initiated homogeneous grafting of styrene to benzylcellulose. found in the catalog.
Radiation initiated homogeneous grafting of styrene to benzylcellulose.
Robert Warren Betty
Written in English
|Contributions||Toronto, Ont. University.|
|The Physical Object|
|Number of Pages||189|
The resulting grafted branches are attached to the trunk polymer by covalent bonds. Radiation is particularly suited for activating polymers since polymeric free radicals arise under irradiation and these are active in initiating polymerization. This is the main advantage of radiation-initiated graft copolymerization. grafting levels when grafting styrene, mcthyl methacrylate, vinyl acetate and vinyl pyridine onto cellulosel~. his investigation was carried out to modify thc p ysical and dyeing propenies of cotton fabrics via, ircct radiation grafting of acrylollitrile (AN), acrylic d 'id Cited by: 3.
Gupta, B., Gautam, D. & Ikram, S. Preparation of proton exchange membranes by radiation-induced grafting of alpha methyl styrene–butyl acrylate mixture onto polyetheretherketone (PEEK) films. by: 2. In homogeneous media, N,N-Dimethylacrylamide (DMA) was grafted copolymerization to cellulose by a metal-catalyzed atom transfer radical polymerization (ATRP) process. First, cellulose was dissolved in DMAc/LiCl system, and it reacted with 2-bromoisobutyloyl bromide (BiBBr) to produce macroinitiator (cell-BiB). Then DMA was polymerized to the cellulose backbone in a homogeneous DMSO solution in Cited by:
Radiation grafting of photo-stabilizer on low density polyethylene was per-formed to improve the photo-stability of polyethylene. The improvement of the polymer stability continues to be an area of active industrial concern and intensive research effort. Polyeth-. Ionizing radiation can induce some kinds of reactions, other than polymerization, such as dimerization, oligomerization, curing, and grafting. These reactions occur through a regular radical chain causing growth of polymer by three steps, namely, initiation, propagation, and termination. To understand ionizing radiation-induced polymerization, the water radiolysis must be taken into by: 3.
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Not Available adshelp[at] The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86ACited by: 2. The radiation-induced graft copolymerization is an effective method for modification of the chemical and physical properties of polypropylene.
Graft copolymerization of styrene onto polypropylene fibers has been studied by simultaneous irradiation method, using a 10 MeV electron by: grafting due to the consumption of energy of irradia-tion.
Similar behaviour was observed when the same three solvents were used to dilute styrene during its grafting onto PFA and FEP ﬁlms,34 Based on the results obtained from this study, dichloromethane was chosen as a diluent for styrene in the present grafting system.
Irradiation dose. Grafting on wool. Electron microscopic studies on the location of grafted polymer in wool structure. Radiation‐initiated homogeneous grafting of styrene to benzylcellulose. Betty; W.
Rapson; Pages: ; First Published Radiation‐induced polymerization at high pressure of 2,3,3,3‐tetrafluoropropene in bulk and. • Radiation grafting ofacrylicacid and acrylonitrile improves oil resistance of butadiene styrene copolymer, and ofethylene-propylene diene terpolymer • Encapsulated Fertilizer • Successive radiation grafting ofmethyl methacrylate, followed byvinylidene chloride, on carbamide (carbamide/polymer, 95/5) to File Size: KB.
A compilation of the different membranes obtained by grafting is given in Tab. This work was supported by the Bundesminister f Forschung and Technologie. Radiation initiated grafting on fuoro polymers for membrane preparation 10i 7.~ MI 1Y.~KCited by: Reversible addition−fragmentation chain transfer (RAFT) polymerization was applied to radiation-induced graft polymerization of styrene from cellulose.
The grafting of styrene from cellulose substrates using the chain transfer agent cumyl phenyldithioacetate was confirmed by Raman and X-ray photoelectron spectroscopy, differential scanning calorimetery, thermogravimetric analysis, scanning Cited by: Improvement of PEM by radiation-induced grafting of styrene onto FEP film with subsequent sulfonation Korean J.
Chem. Eng.(Vol. 25, No. 5) gree of grafting at 60oC was lower than that at 45oC after 3 hours of grafting, even though a higher temperature leads to a faster grafting rate in the early stage of grafting. grafted with styrene by chemistry radiation.
The graft and ungraft samples were characterized by TGA, DSC, FTIR and degree of grafting (DOG). In this experiment the radiation grafting of styrene onto PP was initiated by simultaneous irradiation method under cobalt–60 gamma rays source, under nitrogen atmosphere at room temperature.
GRAFTING OF STYRENE ONTO FLUOROPOLYMERS FILMS VIA GAMMA RADIATION Adriana N. Geraldes 1*, Heloísa A. Zen 1, Duclerc F. Parra1, Ademar B. Lugão, Marcelo Linardi1 1 Instituto d e Pesqu isas Energéticas e Nucleares (IPEN), Centro d Química e Meio Amb ente (CQMA), Av Prof Lin u Prestes, São Paulo, Brazil – [email protected] Following its subsequent sulfonation, the styrene-grafted FEP film exhibited considerably higher values of both the IEC and IC and less methanol crossover than the Nafion membrane.
The grafting of styrene onto the FEP polymer is thought to be initiated by the abstraction of F atoms from the CF3 groups in the polymeric by: 6. Grafting of styrene onto silicone sealant films was realized in different methanol solutions by gamma radiation, from a 60Co source at room temperature.
The styrene grafted onto silicone sealant films was synthesized by pre-irradiation oxidative method. Pre-irradiation method was optimized by tuning the γ-irradiation dose, reaction time, temperature, and monomer : Giovanni González-Pérez, Guillermina Burillo.
Styrene has been successfully grafted onto cotton cellulose under ‘homogeneous’ conditions provided by initial methylolation using the cellulose/DMSO/HCHO system. The attendant homopolymerization reaction has also been examined.
Both grafting and homopolymerization show a rapid initial rate which appears to level off. The homopolymerization reaction increases with increasing Cited by: The changes of radiation-induced in polypropylene (PP) pellets exposed to gamma irradiation in inert atmosphere were investigated in correlation with the applied doses (10 and 50 kGy).
Also, results from the grafting of styrene onto PP pellets using simultaneous irradiation at the same doses are presented. The graftingAuthor: Camila P. Souza, Henrique P. Ferreira, Duclerc F. Parra, Ademar B. Lugão. Crosslinked sulfonic acid cation exchange membranes of reasonable properties were successfully prepared by radiation grafting of styrene/DVB mixtures onto PFA films.
The presence of the DVB in the bulk grafting solution reduces the degree of grafting in the membranes and such decrease is a function of DVB by: Radiation initiated grafting on fluoro polymers II. Grafting of N‐vinylpyrrolidone on copolymers of vinyl fluoride and vinylidene fluoride by accelerated electrons.
In this study, the fabrication of silica‐grafted‐sulfonated styrene (S‐g‐SSt) resin by grafting of styrene onto silanized silica via gamma radiation‐induced polymerization and subsequent.
The kinetics of the radiation induced graft polymerization was studied. Evidence for the existence of the graft chains in grafted PVDF was characterized by FT-IR spectroscopy in ATR mode.
Then, membranes were cast from pristine PVDF and PVDF-g-PVP of different degree of grafting (DG) under phase inversion by: Request PDF | Effects of Gamma Radiation on the Physicochemical Properties of Polyester Resin and Its Use in Composite Materials | In this chapter is discussed the importance of using gamma.
Post-irradiation grafting of sodium styrene sulfonate (SSS) in the presence of acrylic acid (AA) has been investigated on polyethylene (PE) pre-exposed to gamma radiation at room temperature in the air.
Special attention was paid to the effect of low molecular weight salt additives on the kinetics of graft copolymerization of SSS and AA.
The presence of SSS links in the grafted PE Cited by: 2. simultaneous radiation grafting of styrene into low density PE films and subsequent sulfonation . The correlations between the grafting yield and the physico-chemical properties of membranes were established .
The thermal and structural properties of the membranes were also investigated .Polypropylene waste (PPw) was resulted from accelerated thermal ageing of polypropylene (PP). Bulk grafting of acrylonitrile (AN) onto PPw was achieved by simultaneous radiation grafting method using gamma rays.
Degree of grafting of AN on PPw is affected by absorbed dose and dose rate.Post-irradiation grafting of sodium styrene sulfonate (SSS) in the presence of acrylic acid (AA) has been investigated on polyethylene (PE) pre-exposed to gamma radiation at room temperature in the air.
Special attention was paid to the effect of low molecular weight salt additives on the kinetics of graft copolymerization of SSS and by: 2.