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graft copolymerization OF ACRYLAMIDE ONTO THE UV-RAY IRRADIATED FILM OF POLYESTER-POLYETHER

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Chinese Journal of Polymer Science 1988年第1期6卷 14-19页

作者：陈传福李学芬李执芬 Academia Sinica Beijing Institute of Chemistry

In this paper the Ce(Ⅳ) salt initiated graft copolymerization of acrylamide onto the film of polyesterpolyether block copolymer irradiated by UV-ray was reported. The UV-irradiation of the film and its graft process have been investigated by UV spectrum, ESR and ESCA and the influence of other factors on the graft copolymerization has been discussed.

关键词： Polyester-Polyether block copolymer graft copolymerization UV-irradiation Acrylamide.

graft copolymerization of Ethyl Acrylate onto Hydroxypropyl Methylcellulose Using Potassium Persulfate as Initiator

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Transactions of Tianjin University 2006年第6期12卷 410-414页

作者：王丽丽许涌深邓树斌袁才登 School of Chemical Engineering and Technology Tianjin University

With potassium persulfate (KPS) as initiator, graft copolymerization of ethyl acrylate (EA) onto water-soluble hydroxypropyl methylcellulose (HPMC) was investigated in aqueous medium. Effects of monomer concentration, initiator concentration, matrix concentration, and reaction temperature on the percentage of grafting (G) and grafting efficiency (G_E) were studied. The results show that G and G_E values both increase with the the increase of EA concentration and KPS concentration; when raising HPMC concentration from 0.12 mmol/L to 0.47 mmol/L, G decreases, while G_E increases;and when raising reaction temperature from 50 ℃ to 65 ℃,G increases, but G_E decreases. In addition, the graft copolymers were characterized by Fourier transform infrared (FTIR) spectra and transmission electron microscopy (TEM) methods.

关键词： graft copolymerization ethyl acrylate hydroxypropyl methylcellulose

graft copolymerization of N-isopropylacrylamide with 3-(methacryloxy)propyl trimethoxysilane on ultrafine silica and its application in chromatography separation

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Frontiers of Chemical Science and Engineering 2008年第3期2卷 242-247页

作者： Liping ZHANG Yi ZHU Caihua NI School of Chemical and Material Engineering Jiangnan UniversityWuxi 214122China

Thermosensitive core-shell particles were synthesized through graft copolymerization of N-isopropylacrylamide with[3-(methacryloxy)propyl]trimethoxysilane(MPT)coupled on the surface of ultrafine silica *** copolymerization was carried out using polyvinyl alcohol as a surfactant,water and cyclohexanol as mixed solvent,and 2,29-azobis(isobutyronitrile)as an *** effect of surfactant concentration and the composition of the mixed solvent on the graft rate were *** structure of modified silica was confirmed by infrared *** scanning calorimetry(DSC)has revealed the thermosensitivity of the *** thermosensitive particles were used as packing materials of high performance liquid chromatography(HPLC)columns for separating naphthalene *** separation was obtained by controlling the temperature of the *** contrast,the packing material of silica-MPT has no such separation efficiency due to the lack of *** effect of the composition of the mobile phase on the separating efficiency was also *** temperature-controlled separation was effective only when the water content was higher than 90%(v/v)in the water-methanol mobile *** mechanism for the temperature-controlled separation is attributed to a polarity change of poly(N-isopropylacrylamide)which undergoes volume phase transition on the silica surface as the temperature increases.

关键词： N-isopropylacrylamide thermosensitivity separation HPLC graft copolymerization

graft copolymerization of cellulose and 2-hydroxyethyl methacrylate in an ionic liquid

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Forestry Studies in China 2011年第3期13卷 245-251页

作者： XIAO Shu XIN Ting-ting HE Jing College of Materials Science and Technology Beijing Forestry University Beijing 100083 E R. China

Dissolution and homogeneous graft copolymerization of cellulose were performed in an ionic liquid 1-allyl-3-methylimidazolium chloride （AmimCl） with 2-hydroxyethyl methacrylate. The synthesized AmimCl and cellulose graft copolymers were characterized by FTIR, ^1 H-NMR and XRD spectroscopy. The results show that AmimCl dissolved cellulose directly by destroying intermolecular and intramolecular hydrogen bonds in cellulose and the crystalline form of cellulose was transformed from cellulose Ⅰ to cellulose Ⅱ after regeneration from AmimCl. The best synthetic condition of the cellulose-graft-P （2-hydroxyethyl methacrylate） was that cellulose 0.5 g, 2-hydroxyethyl methacrylate 3.00 g and initiator ammonium persulfate 0.05 g reacted for 180 min at 60℃; the rate of grafting reached 77.3%.

关键词： cellulose ionic liquid dissolution graft copolymerization

MODIFICATION OF SILK FIBER via EMULSION graft copolymerization WITH FLUOROACRYLATE

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Chinese Journal of Polymer Science 2008年第3期26卷 353-362页

作者：李战雄 College of Material Engineering Soochow UniversitySuzhou 215021China

2,2,3,3,4,4,5,5-Octafluoropentyl acrylate was grafted onto silk fiber in a two-step heterogeneous system through the vinyl bonds of acryloyloxyethyl isocyanate modified on the *** grafted copolylner was analyzed by FTIR and WAXD,and the results revealed that the fluoroacrylate was successfully grafted onto silk fiber and the crystalline structure of silk fibroin withβ-sheet structure was not changed after graft *** FT-IR corrected method was used to simulate the grafting yield onto sil...

关键词： graft copolymerization Silk Fluoroacrylate Modification

THE EFFECTS OF MAGNETIC FIELD ON graft copolymerization OF METHYL METHACRYLATE ONTO POLYVINYL ALCOHOL IN THE PRESENCE OF BENZOPHENONE DURING UV IRRADIATION

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Chinese Journal of Polymer Science 1990年第2期8卷 108-114页

作者：黄骏廉邬青峰 Institute of Material Science Fudan University Shanghai

The effects of magnetic field on the graft ratio and stereoregularity of grafts of PVA-g-MMA in the presence ofbenzophenone during UV irradiation are discussed. By means of IR, it was found that the graft ratio was increased with the increment of magnetic field strength. Furthermore, application of relative weak magnetic field of 0.4 Tesla had been shown to substantially enhance the stereo-regularity of graft copolymer. The maximum stereo-regularity appeared when the graft ratio approached to 85% with the magnetic field of 1.2 Tesla (T). The resistance to moisture and heat resistance of the grafted copolymer in the presence of magnetic field were also improved.

关键词： Magnetic field graft copolymerization Methyl methacrylate Polyvinyl alcohol Benzophenone UV irradiation

Preparation of superabsorbent by graft copolymerization of acrylic acid onto corn starch using K_2S_2O_8 and rare earths as initiators

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Journal of Harbin Institute of Technology(New Series) 2008年第6期15卷 831-834页

作者：白永平李卫东冯立群赵超 Dept.of Applied Chemistry Harbin Institute of Technology

K2 S2 O8 and rare earths （RE） were used as initiators to prepare superabsorbents by graft copolymerization of acrylic acid （ AA ） onto corn starch. The effects of monomer concentration, initiator K2 S2 O8 concentration, cross-linker concentration, reaction temperature and the concentration ratio of RE and K2 S2O8 on the graft copolymerization were studied in terms of the water absorption capacity of superabsorbents. Results indicate that the optimum conditions obtained for the grafting of AA onto 5g starch are as follows： AA of 75. 773 g/L, K2S20s of 0. 437 g/L, RE of 0. 874 g/L, cross-linker of 0. 381 g/L and temperature of 70 ℃. The maximum water absorption capacity obtained is 740 g/g. The new method of graft polymerization is easily proceeded and controlled. The graft copolymers were characterized by infra-red spectroscopy, scanning electron microscopy and TG. Results characterized by IR and SEM give strong evidence for grafting of AA onto corn starch, and those characterized by TG reveal that the grafting of AA improves the theimostability of corn starch.

关键词： superabsorbent graft copolymerization starch acrylic acid rare earths

Modification of Natural Rubber Latex by graft copolymerization of 2-Ethylhexyl Acrylate and Methacrylic Acid

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Transactions of Tianjin University 2020年第4期26卷 314-323页

作者： Xueyuan Wang Fanglian Yao Jie Su Xin Zhang Xiaolei Tong Zhihui Qin Caideng Yuan School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China

Natural rubber(NR)grafted with 2-ethylhexyl acrylate(2-EHA)and methacrylic acid(MAA,collectively NR-g-PEHA/MAA)was synthesized by emulsion *** and cumene hydroperoxide were used as redox *** successful grafting of 2-EHA and MAA onto NR was confirmed by Fourier transform infrared *** morphology of the NR latex particles was observed by transmission electron *** effects of reaction temperature,initiator dosage,feeding mode,and hard monomer content on the mechanical properties of the modified NR film were *** polymer chains were unevenly wrapped on the outside of NR particles,and smaller particles were more easily *** was characterized using a toluene swelling *** stability and glass transition temperature were examined by differential scanning calorimetry and thermogravimetric *** results showed that the thermal stability of NR-g-PEHA/MAA had been improved,and the glass transition temperature(Tg)was unchanged.

关键词： Natural rubber latex graft copolymerization Crosslinking Acrylate Aziridine

Studies on graft copolymerization of Acrylic Acid onto Ramie Fibers with Chromic Acid Initiation System

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Wuhan University Journal of Natural Sciences 1998年第3期3卷 105-111页

作者： Xiao, Chaobo Wu, Lili Ren, Shaozhi Wuhan Univ Wuhan China

The graft copolymerization of acrylic acid (AA) with unswollen and swollen ramie fibers using chromic acid (H 2CrO 4) as the initiator has been studied in the presence of air. The effects of initiator concentration, monomer concentration, perchloric acid (HClO 4) concentration, time of polymerization, reaction temperature, and amount of ramie fibers on the graft percentage have been found out. The graft copolymer was characterized by IR spectra, scanning electron microscopy(SEM), differential thermal analysis (DTA), and thermogravimertric analysis (TGA).

关键词： graft copolymerization acrylic acid ramic fiber chromic acid