Copolymerization of N-vinylformamid and N-vinylcaprolactam
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N-vinylformamid is isomer of acrylamide.The latter can be used to replace copolymerization of N-vinylformamid and its copolymer,reducing second environmental pollution.In different molar ratio's condition,N-vinylformamid and acrylamide can carry out copolymerization before the copolymerization of N-vinylcaprolactam and N-vinylformamid continue.A study of the different monomers and different molar ratio's process of copolymerization is conducted.The copolymer compositions are analyzed and the glass transition temperatures of copolymer are determined.Keywords:
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The copolymerization of N-vinylformamid and N-phenylmaleimid,N-vinylformamid and acrylonitrile is carried out in condition of different molar ration to study their relevant copolymerization behavior.The copolymer composition is analyzed by the element instrument,Infrared spectroscopy(IR) and the glass transition temperatures of copolymer are determined by the differential scanning calorimetry(DSC),providing theoretical and experimental basis for the application of N-N-(vinylformamid) and its copolymer.
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Through the copolymerization of N-vinylformaind(NVF) and N,N-dimethylacrylamide(DMAM),the process of the copolymerization of different molar ratios was studied.The copolymer products were analyzed by the elementary instrument and Infraed Spectroscopy(IR),and their glass transition temperatures were detemined.The paper can provide the theoretical and experimental confirmation for the development of NVF and its serial copolymers and the substitution for polyacrylamid.
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The copolymerization of N-vinylformamide (NVF) and diallyldimethylammonium chloride (DADMAC) was initiated by AIBA·2HCl . The effects of initiator concentration, monomer ratio , reaction temperature and time were studied. The results show that the copolymer obtained have a high cationicity and yield; when reaction temperature was 7h, the DADMAC conversion, the cationicity and intrinsic viscosity of NVF-DADMAC copolymer could attain 90.83%, 18.61% and 125.66mL/g respectively at the conditions of 60℃ , n(NVF) :n(DADMAC)=4:1(mol ratio),ω (monomer)=20%,ω (AIBA·2HCl) =0.5%.The FTIR spectra illustrated copolymerization of NVF and DADMAC.
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N-Vinylpyrrolidone
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The copolymerization of 4\|vinyl pyridine(4\|VP) with acrylamide(AM) has been realized by radical copolymerixation in solution using potassium persulfate as initiator.The effects of acetone/water and DMF/water solvent systems,comonomer concentration,polymerization temperature,polymerization time and initiator amount on the conversion of the polymerization and molecular weight were investigated in detail.The results showed that the mixed solvent DMF/water=1( V/V) is suitable for the copolymerization of 4\|VP and AM.The composition of copolymer was determined by ultraviolet spectrophotometry and the structure of copolymer was characterized and verified by FTIR and 13 C\|NMR.Finally,The monomer reactivity ratios of 4\|VP and AM were obtained with Kelen\|Tudos method, r \- 4\|VP =0\^644, r AM =0 371.
Comonomer
Potassium persulfate
Reactivity
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Vinyl acetate
Reactivity
Methyl acrylate
Vinyl polymer
Acryloyl chloride
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Macromonomer
Cationic polymerization
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Acryloyl chloride
Azobisisobutyronitrile
Ethyl acrylate
Dimethyl formamide
Butyl acrylate
Methyl acrylate
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Abstract Acrylamide derivatives were copolymerized with styrene in an emulsifier‐free aqueous medium, and the copolymerization mode and the characteristics of the resulting latices were compared with those of a styrene–acrylamide copolymerization system. In their copolymerization mode, N ‐(hydroxymethyl)acrylamide and N , N ‐dimethylacrylamide resembled acrylamide, and their heterogeneous copolymerization course was divided into three stages on the basis of the main reaction locus. Copolymerization of styrene–methacrylamide did not resemble that of the others. The interfacial property and reactivity of acrylamides affected not only the polymerization mechanism but also the latex properties, e.g., particle size, distribution of acrylamides units in the latex, etc. The narrowest distribution of particle size was obtained in styrene– N ‐(hydroxymethyl)acrylamide copolymerization at a monomer ratio of 10:1. Delayed addition of styrene into the aqueous solution of N ‐(hydroxymethyl)acrylamide prepolymerized to some extent was found to be effective in preparing a latex with nearly monodisperse and large particles.
Methacrylamide
Dispersity
Reactivity
Hydroxymethyl
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