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2-丙烯酰胺基-2-甲基丙磺酸共聚物的水溶液性质研究 总被引:3,自引:0,他引:3
以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为基料,用水溶液引发聚合的方法合成了AMPS/AM/AA/DEAM(2-丙烯酰胺基-2-甲基丙磺酸/丙烯酰胺/丙烯酸/二乙基丙烯酰胺)四元共聚物,对其水溶液性质进行了研究。结果表明此共聚物具有较好的抗高温、抗高盐能力,是一种新型的耐温抗盐驱油用聚合物。 相似文献
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淀粉-丙烯酰胺-甲基丙烯酰氧乙基三甲基氯化铵接枝共聚研究 总被引:1,自引:0,他引:1
采用氧化还原引发体系,在水溶液中接枝聚合制备了淀粉、丙烯酰胺(AM)与甲基丙烯酰氧乙基三甲基氯化铵(DMC)接枝共聚物。考察了反应温度、反应时间、引发剂浓度、单体质量比对接枝率、接枝效率及阳离子度的影响,确定了最佳反应条件:淀粉7.5g,AM15g,引发剂浓度0.4mmol/L,反应温度45℃,反应时间5h,m(DMC):m(AM)为1:3,所得接枝共聚物的接枝率为136.18%,接枝效率为79.8%,阳离子度为19.2%。 相似文献
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通过正离子聚合法制备了异丁烯-对甲基苯乙烯无规共聚物,考察了单体浓度、聚合温度以及聚合时间对正离子聚合的影响,并通过光照溴化反应对共聚物进行溴化改性,制备出主链结构完全饱和的溴化异丁烯-对甲基苯乙烯无规共聚物(BIMS),对其结构与性能进行了表征。结果表明,在-80℃、单体质量分数为25%~28%时,异丁烯与对甲基苯乙烯正离子共聚合,聚合物的数均分子量可达2.1×10~5。随着温度的降低,聚合物的数均分子量增大,分子量分布变窄。随着溴含量的增加,BMIS中苄基溴含量也增加,当溴质量分数为1.9%时,聚合物中苄基溴摩尔分数达到1.38%。BIMS热稳定性较好,在较低的温度下仍能保持橡胶的高弹性,且耐热氧老化性能优异。 相似文献
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含α-甲基苯乙烯共聚物及其在共混改性中的应用进展 总被引:1,自引:0,他引:1
系统阐述了含α甲基苯乙烯共聚物及其在共混改性方面的应用进展。着重介绍了α甲基苯乙烯的聚合特性、制备方法、共聚物种类及共混改性研究的概况;并对α甲基苯乙烯共聚物的发展应用前景作了展望。 相似文献
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在-80℃下,以2-氯-2,4,4-三甲基戊烷(TMPCl)/四氯化钛(TiCl4)/2,6-二叔丁基吡啶(DtBP)为引发体系,氯甲烷(CH3Cl)/环己烷(Chx)(体积比为50/50)为溶剂采用正离子聚合技术研究异丁烯与对甲基苯乙烯的共聚行为。研究异丁烯与对甲基苯乙烯不同投料比以及不同转化率下的共聚组成,利用Kelen-Tudos与Yezreielv-Brokhina-Roskin法计算单体的竞聚率;用1 H-NMR方法测定异丁烯和对甲基苯乙烯共聚物组成。结果表明,在低转化率(小于15%)的条件下,异丁烯与对甲基苯乙烯的竞聚率分别为r1=0.248,r2=1.190。 相似文献
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甲基丙烯酰氧乙基三甲基氯化铵与丙烯酰胺的合成研究 总被引:1,自引:0,他引:1
丙烯酰胺(AM)与甲基丙烯酰氧乙基三甲基氯化铵(DMC)进行水溶液聚合,考察了引发剂浓度、温度、单体配比、pH值、引发剂等因素对共聚物的阳离子度、特性黏度以及相对分子质量的影响。结果表明,制备高相对分子质量的阳离子型聚丙烯酰胺的最佳工艺条件为:pH为8,温度为50℃,引发剂的用量为0.8 mmol/L,DMC∶AM(摩尔比)=1∶3。 相似文献
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以衣康酸(IA)、马来酸(MA)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,以过硫酸铵为引发剂,以水为溶剂,通过自由基聚合合成了一种新型的三元共聚物,探讨了单体配比、聚合温度、引发剂用量、聚合时间等合成条件对阻垢性能的影响,确定了最佳的合成条件为:单体配比n(IA)∶n(MA)∶n(AMPS)=1∶1∶1,聚合温度80℃,引发剂占单体质量分数的5%,聚合时间2h;用红外分光光度仪分析证明得到了预期的产物结构,并测定了产物的特性黏度和固含量。通过静态法对三元共聚物的阻垢性能进行评价,在加剂量为50mg/L时阻碳酸钙率最佳可达93.6%,是一种性能优异的阻垢剂。 相似文献
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The core-shell grafting copolymer of α-methyl styrene-methyl acrylate on poly(butyl acrylate) was synthesized. The particle morphology of latex and core-shell grafting polymerization was investigated as a function of: (a) reaction temperature; (b) initiator concentration used in the secondary polymerization; (c) monomer to polymer ratio; (d) emulsifier concentration. The compatibility of this copolymer with poly(vinyl chloride) (PVC) was determined by the method of solubility parameter and scanning electron microscopy. The rheological behavior of the blend of this copolymer with PVC was investigated. The mechanical properties of the blend were determined. The results show that this copolymer can be used as processing aid for PVC. © 1994 John Wiley & Sons, Inc. 相似文献
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The radiation-induced copolymerization of the methyl chloride salt of N,N-dimethylaminoethyl methacrylate (DMAEM·MC) with acrylamide (AAm) was used to prepare a cationic polymer flocculant. The polymerization rate increased with increasing dose rate, polymerization temperature, monomer concentration and mole fraction of AAm in the monomer mixture. The molecular weight of the copolymer was also found to increase with monomer concentration and mole fraction of AAm, but at high concentration and fraction of AAm, intermolecular crosslinking tends to occur during the polymerization to form water-insoluble copolymer. A water-soluble copolymer having various molecular weights and cationic strengths can be synthesized by selecting suitable reaction conditions; i.e., this radiation process can provide a much higher molecular weight copolymer with a wide range of cationic strength. The flocculation effect was evaluated using sludge from wastewater of sugar manufacture. It was found that the radiation-polymerized copolymer DMAEM·MC–AAm has an excellent flocculation effect. 相似文献
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以(NH4)2S2O8/Na2SO3/CuSO4为氧化-还原引发体系、十二烷基硫酸钠(SDS)为乳化剂,采用间歇乳液聚合合成氯乙烯/异丁基乙烯基醚(VC/IBVE)共聚物。结果表明,当投料单体中IBVE质量分数增加时,相同聚合时间的聚合转化率和共聚物特性粘度明显降低。当转化率小于70%时,共聚物平均组成变化不大;聚合温度增加使聚合速率增加,但共聚物特性粘度减小;SDS浓度对聚合速率和共聚物特性粘度的影响很小;随引发体系浓度增加.聚合速率增加,共聚物特性粘度变化不大。 相似文献
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乳液接枝法合成氯丁接枝胶MCR 总被引:2,自引:1,他引:1
用乳液接枝法合成了氯丁橡胶(CR)/甲基丙烯酸甲酯(MMA)接枝共聚物MCR,并通过盐水凝胶、水洗、干燥制得块干胶。研究了氯丁二烯种子胶乳转化率、分子量调节剂用量、残留氯丁二烯含量以及接枝反应温度、CR/MMA比例对接枝率的影响。对接枝共聚物的粘接性能进行了测试。 相似文献
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利用2,2'-偶氮(2-脒基丙烷)二氯化氢(AIBA)引发剂与纳米氧化硅粒子的静电作用而使AIBA吸附在纳米氧化硅表面,进而引发丙烯腈-甲基丙烯酸甲酯(AN-MMA)原位乳液聚合.考察了AIBA浓度和反应温度对AN-MMA原位乳液聚合动力学的影响以及氧化硅含量对AN-MMA共聚物/纳米氧化硅复合乳胶粒径分布和形态的影响.结果表明:聚合速率随AIBA浓度和聚合温度的升高而增大; AIBA浓度相同时,原位乳液聚合速率小于普通乳液聚合;AN-MMA共聚物/纳米氧化硅复合粒子粒径随纳米氧化硅含量增加而增大;原位乳液聚合得到的复合胶粒表面粗糙,当纳米氧化硅质量分数为10%时,纳米氧化硅与聚合物乳胶粒子复合良好;当纳米氧化硅质量分数为20%和30%时,有部分纳米氧化硅粒子与乳胶粒子分离而分散在连续相中. 相似文献
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Chunyan Wang Xiaorui Li Jingqian Chen Guiqiang Fei Haihua Wang Qin Liu 《应用聚合物科学杂志》2011,122(4):2630-2638
A graft copolymer was synthesized by graft copolymerization of starch with styrene (St) and butyl acrylate (BA), using ferrous sulfate‐hydrogen peroxide redox initiation system. The starch was pregelled in the presence of acrylonitrile (AN) in aqueous alkali at high temperature before graft polymerization. Major factors affecting the polymerization reaction were investigated. It was found that a graft copolymer with higher percentage conversion (PC), graft efficiency (GE) and graft percentage (GP) was obtained by controlling the initiator concentration, concentration, and ratio of monomers and polymerization temperature. The optimum conditions were as follows: H2O2 concentration, 12%; monomer concentration, 120%; St/BA ratio, 1 : 1; polymerization temperature, 65°C. Fourier transform infrared spectroscopy and NMR analyses were used to gain information on the structure of the products. It was demonstrated that St, BA, and AN had been successfully grafted onto starch and ? CN had been saponified into ? CONH2 and ? COO? to a certain degree when pregelling. Scanning electron microscope micrographs showed the coarse structure and broad network. The graft polymerization took place on the surface of starch granule and led to amorphization of the starch structure. Graft polymer had better thermal stability and was endowed with pseudo‐plasticity. It was observed that the starch graft copolymer offers good properties such as water resistance as surface‐sizing agent. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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