高强耐水抗蠕变抗冻拼木胶的研制

］本文介绍了采用共聚方法和特殊制备工艺对聚醋酸乙烯酯乳胶进行改性研制出具有高粘接强度、耐水、抗蠕变、抗冻等性能的拼木用乳胶。     

Radical copolymerization of ethylene glycol bis(methyl fumarate) with N-vinylcarbazole

Summary For the purpose of elucidating copolymerizability of ethylene glycol bis(methyl fumarate), a new multifunctional monomer, its free-radical Copolymerization with N-vinylcarbazole has been studied. The results show that free-radical Copolymerization of ethylene glycol bis(methyl fumarate) with N-vinylcarbazole produces soluble copolymers at low conversions, the compositions of which vary from 1∶1 to increasingly VCZ rich (below 2.0) with an increase in the VCZ content in the monomer feed. It is suggested that 1∶1 alternating Copolymerization proceeds and that cyclo-propagation becomes predominant when the monomer feed composition becomes rich in VCZ. Gelation occurs at relatively high conversions.     

Copolymerization of Styrene with Methacrylates in Petroleum Bitumen and Properties of Resulting Composites

Theoretical Foundations of Chemical Engineering - Copolymerization of styrene with methyl or butylmethacrylates in road petroleum bitumen is studied. The copolymerization of the comonomers selected...     

国产CR与MMA接枝聚合研究

以国产可接枝ＣＲ－２４４胶为接枝本体，用ＭＭＡ对其进行接枝改性制得了性能满意的接技胶粘剂。本工艺的特点：（１）国产可接枝ＣＲ代替Ａ－９０；（２）省去通氮设施；（３）重复性好     

Wasserlösliche kationisch modifizierte copolymere mit acrylamid

Copolymerization of acrylamide with N-[3-(N′-diethyl-N′-methyl)-ammonium-n-propyl]-maleinimide-methylsulfate in acetone/water with persulfate as initiator gives powdered cationic polymers with high molecular mass; they show good water solubility and very good flocculation ability. The copolymer has the same composition as the used monomer mixture. Yield and molecular mass of the copolymer increase with increasing quantity of acetone (up to 52 vol-%) in the solvent mixture.     

Fe-Al催化剂催化丙烯腈与甲基丙烯酸丁酯聚合

以Fe(acac)3-Al(i-Bu)3(acac表示乙酰丙酮)催化体系催化丙烯腈(AN)与甲基丙烯酸丁酯(BMA)聚合,考察了聚合规律,用红外光谱和差热分析研究了共聚物结构,凝胶渗透色谱研究了共聚物分子量及其分布。动力学实验表明聚合对单体浓度呈一级反应,表观活化能为46.1 kJ/mol。     

Surface Modification of Poly(Tetrafluoroethylene) Films by Graft Copolymerization for Adhesion Improvement with Sputtered In-Sn Oxides

Surface modification of Ar plasma-pretreated poly(tetrafluoroethylene) (PTFE) films was carried out via UV-induced graft Copolymerization with glycidyl methacrylate (GMA), acrylamide (AAm) and hydroxylethylacrylate (HEA) to improve the adhesion strength with sputtered indium-tin-oxide (ITO). The surface compositions of the graftcopolymerized PTFE films were studied by X-ray photoelectron spectroscopy (XPS). The graft yield increases with increasing monomer concentration and Ar plasma pre-treatment time of the PTFE films. The T-peel adhesion strength was affected by the type of monomer used for graft Copolymerization, the graft concentration, and the thermal post-treatment after ITO deposition. A double graft-copolymerization process, which involved initially the graft copolymeri/ation with AAm or HEA, followed by graft Copolymerization with GMA. was also employed to enhance the adhesion of sputtered ITO to PTFE. T-peel adhesion strengths in excess of 8 N cm were achieved in the ITO graft-modified PTFE laminates. The adhesion failure of the ITO/PTFE laminates in T-peel tests was found to occur inside the PTFE films. The electrical resistance of ITO on all graft-modified PTFE surfaces before and after thermal post-treatment remained conslant at about 30 Ω square, suggesting that the graft layer did not have any significant effect or. the electrical properties of the deposited ITO.     

丙烯酸-马来酸水相共聚合过程中的粒径变化研究

以氧化-还原引发剂Na2 S2O8/Na2S2O5引发丙烯酸-马来酸的水相共聚合,用激光光散射粒径分析仪对共聚合过程中的粒径变化进行了研究.结果表明,体系的平均粒径受聚合物链增长和聚合物链间聚结的影响,随着反应进行而增大.通过分析粒径曲线发现,在加料反应阶段,粒径在100 nm以下的粒子始终保持一定数量,同时周期性地形成粒径在100 nm以上的粒子.     

Reactive monomers and polymers containing chiral groups

N-(p-methylstyryl)-(1R,2S)-ephedrine is prepared by alkylation of p-chloromethylstyrene under conditions which do not favor quaternization. A series of Copolymerization reactions confirm that the new chiral monomer and styrene copolymerize in random fashion with r₁=1.09 and r₂=0.98. The optical rotation of the copolymers does not vary linearly with composition. Applications of the copolymer include its use as chiral ligand for asymmetric synthesis or as a separation medium.     

聚丙烯酸盐类高吸水性树脂的合成研究

以部分中和的丙烯酸为基本单体，采用反相悬浮聚合法，对聚丙烯酸钾、聚丙烯酸铵高吸水性树脂的合成条件进行了研究，获得了吸水树脂的吸液率与交联剂用量、引发剂用量、pH值等影响因素的关系，并利用共聚方法改进了吸水树脂的耐盐性，研制出了性能优良的高吸水性树脂。所制高吸水性树脂吸去离子水倍率≥1200mL/g（最高达2700mL/g)；耐盐性高吸水性树脂吸0．9％ NaCl水溶液倍率≥150mL/g(最高达260mL/g)。     

Copolymerization of alpha-methyl styrene with butyl acrylate in bulk

The kinetics of the copolymerization of alpha-methyl styrene (AMS) and butyl acrylate (BA) have been studied for the first time. Reactivity ratios for the system have been assessed over a range of temperatures (60-140 °C). Copolymerization models that account for monomer depropagation have been considered in order to determine the importance of depropagation effects for the chosen set of reaction conditions. Full conversion range experiments have been carried out to assess the effects of feed composition, temperature and initiator concentration on polymerization kinetics.     

两亲性梳型丙烯酸接枝苯乙烯共聚物的制备与溶胀性质初探

以丙烯酸（AA）和对氯甲基苯乙烯（P—CMS）为原料,制备了带有功能性基团苄基氯的大分子引发剂P（AA-co—CMS）,当投料量为AA：p—CMS为95：5时,P—CMS主要以单个单元均匀的分布在AA主链中。再以苄基氯为引发点,在FeCl2／PPh,催化体系下,引发了苯乙烯（st）的ATRP聚合,制得了结构明确的主链亲水、支链疏水的两亲性梳型共聚物P（AA—co—CMS）-g—PS。采用IR和^1H—NMR表征了共聚物的结构,表明使用此法具有接枝引发效率非常高的特点。初步研究了不同接枝率下P（AA-co—CMS）-g—PS的溶胀性质。     

Graft-polymerization of phosphine functionalized monomers onto silica particles

Summary Triphenylphosphine (PPh₃), a well-known reagent and catalyst, was successfully grafted onto silica particles in a functionalized polymer form using 4-(diphenylphosphinyl)styrene as a monomer. 4-(Diisopropylphosphinyl)styrene and 4-(ditertbutylphosphinyl)styrene were also grafted onto silica in the form of a functionalized polymer and oligomer, respectively. Two methods were used: A) Copolymerization of phosphine-functionalized monomers with a vinyl compound previously attached to silica; and B) Polymerization of phosphine-functionalized monomers using a radical initiator previously attached to silica. The resulting materials were characterized by FTIR, DTA-TGA, specific surface area (S_BET) and XPS. The best results in grafting percent and molecular weight of the grafts were obtained by method B. Received: 7 February 2002 /Revised: 10 July 2002/ Accepted: 10 July 2002     

Siloxane-modified poly(acrylic acid) synthesized in supercritical CO2

Copolymerization of acrylic acid and 3-[tris(trimethylsilyloxy)silyl]propyl methacrylate (TMSPMA) in supercritical carbon dioxide was successfully carried out. The products were obtained in the form of dry white powder with diameter about 0.2 μm. Viscosities of 2% aqueous solution of the copolymers dramatically increased as the content of TMSPMA in the copolymer increased and it was much higher than that of poly(acrylic acid). In addition, the viscosity of the copolymers showed a strong dependence on pH with a maximum at pH 5.0, which is due to the cooperation of intermolecular association and electrostatic repulsion.     

胶束共聚合法合成丙烯酰胺/4-乙烯基吡啶共聚物

以十二烷基苯磺酸钠为表面活性剂 ,过硫酸钾 /亚硫酸氢钠为引发剂 ,进行丙烯酰胺 - 4-乙烯基吡啶胶束共聚合 ,合成了双亲共聚物 ,用1H NMR分析法、差示扫描量热量 ( DSC)对其进行表征 ,并分析了共聚物形成机理。     

Synthesis and characterization of perfluorocyclobutyl (PFCB) polymers containing pendent phenylphosphine oxide

Three phenylphosphine oxide (PPO) containing trifluorovinyl aryl ether monomers were synthesized and polymerized via thermal cyclodimerization affording perfluorocyclobutyl (PFCB) polymers containing PPO pendent groups. The new polymers exhibited moderate to high glass transition temperatures (T_g=145-217 °C) and good thermal stability in nitrogen (5% weight loss, T_d>402 °C). Copolymerization with traditional PFCB forming monomers such as 4,4′-(trifluorovinyloxy)biphenyl resulted in film forming transparent thermoplastic copolymers with improved solubility and further enhanced thermal stability. Semi-fluorinated PPO containing polymers of this type may find potential application as space environment durable materials.     

An Olefin Copolymer with Aggregation-Induced Emission Characteristics Synthesized by Using Metallocene Catalyst

Copolymerization of ethylene with (2-(4-vinylphenyl)ethene-1,1,2-triyl) tribenzene is conducted by using a metallocene catalyst, giving an ethylene copolymer containing tetraphenylethene unit. The result of NMR shows that the tetraphenylethene unit is distributed in isolation in the polymer chain, and the melting point of the copolymer decreases linearly with the increase of the comonomer incorporation. The copolymer can emit blue fluorescence under ultraviolet light, and the intensity increases with the increase of the comonomer incorporation. The fluorescence of flakes made of the copolymer gradually becomes weaker when the temperature is raised. When the temperature is higher than the melting point of the copolymer, the fluorescence is almost invisible.     

聚乙烯—丙烯酸离聚物及其与PET共混

介绍了聚乙烯－丙烯酸的接枝共聚及其钠盐的形成，并应用红外光谱进行了表征，应用聚乙烯－丙烯酸钠与ＰＥＴ共混，研究了离聚物对ＰＥＴ光学性能和力学性能的影响，并测定了共混物的等温结晶速度。     

Graft copolymers having hydrophobic backbone and hydrophilic branches, 8. Effect of temperature on the dispersion copolymerization of poly(ethylene glycol) macromonomer with styrene

Copolymerization of poly(ethylene glycol) macromonomers with terminal meth-acryloyl groups with styrene was carried out in the presence of 2,2′-azobis(N,N′-dimethyleneisobutyramidine) in ethanol/water mixture (4:1, v/v) at various temperatures. The overall activation energy for the dispersion copolymerization was obtained as 48 kJ/mol.     

Polymerization and copolymerization of vinyl carbamates and vinyl carbonates

Poly(vinyl carbamates) and poly(vinyl carbonates) of high molecular weight have been obtained by polymerization of the corresponding monomers prepared from vinyl chloroformate. Poly(vinyl carbonates) can also be prepared by chemical modification of poly(vinyl chloroformate) with alcohols and phenols. Copolymerization parameters of phenyl vinyl carbonate with vinyl acetate have been determined in methylene chloride, at 35°C, with dicyclohexyl peroxydicarbonate as initiator.