AM/AMPS/DMAM三元共聚物的合成及性能研究

为提高驱油用聚合物的耐温抗盐性,采用N,N-二甲基丙烯酰胺(DMAM)与2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、丙烯酰胺(AM)通过氧化还原引发剂体系聚合方法合成了AM/AMPS/DMAM三元共聚物,用正交实验法确定了最佳合成方案为:温度40℃,pH值为11,引发剂浓度为0.18%,单体浓度为13%,DMAM加量为2%。对共聚物的耐盐性及热稳定性进行测试,在标准盐水中共聚物为2500 mg/L,温度为30℃时,粘度可达到35.3 mPa.s;温度为90℃时,粘度为9.70 mPa.s。结果表明,AM/AMPS/DMAM三元共聚物具有较好的抗盐性能和增粘性能,但抗温效果并不明显,有待进一步改进。     

一种水溶性AM/AA/AI共聚物的合成及性能研究

由丙烯酰胺(AM)、丙烯酸(AA)、烯丙基咪唑(AI)在过硫酸铵-亚硫酸氢钠氧化还原引发体系下合成了一种新型的AM/AA/AI水溶性三元共聚物。确立了最佳反应条件:AM∶AA=2∶1(wt%),单体AI的用量为0.1wt%(占单体总质量),引发剂用量0.45wt%,反应温度40℃;并通过红外光谱分析确认了AM/AA/AI三元共聚物结构。当NaCl,CaCl2浓度分别在12000 mg/L,1400 mg/L时,AM/AA/AI三元共聚物的粘度保留率分别约为41%,30%。     

AM/NVP/N-MAM三元共聚物驱油剂的合成及性能研究

以丙烯酰胺(AM)、N-乙烯基吡咯烷酮(NVP)、N-羟甲基丙烯酰胺(N-MAM)为单体,过硫酸铵-亚硫酸氢钠[(NH4)2S2O8-NaHSO3]为氧化还原引发剂,合成了一种水溶性共聚物AM/NVP/N-MAM。确定了最佳反应条件:m(AM)∶m(NVP)∶m(N-MAM)=80∶9∶2.5,pH为9,温度60℃,引发剂加量0.3%。对AM/NVP/N-MAM共聚物进行了红外结构表征,确立了聚合物的结构。与部分水解聚丙烯酰胺相比,该聚合物具有较好的抗剪切耐温性(1 000 s-1:其粘度保留率达17.52%;120℃:其粘度保留率达22.6%)。当NaCl、CaCl2、MgCl2浓度分别为12 000,1 200,1 200 mg/L时,该聚合物粘度保留率分别可达到25.34%,22.21%,23.89%。此外,相对于水驱,该聚合物可提高采收率12.63%(聚合物浓度1 750 mg/L)。     

AM/AMPS/AMC14 S共聚物的合成

采用氧化-还原引发体系,合成了丙烯酰胺(AM)/2-丙烯酰胺基-2-甲基丙磺酸(AMPS)/2-丙烯酰胺基十四烷磺酸(AMC14S)三元共聚物.用红外光谱分析了聚合物的结构,初步评价了共聚物的溶液性能.结果表明,AM/AMPS/AMC14S共聚物具有较好的热稳定性和耐温抗盐能力.     

P(AM/AMPS/NVP)降失水剂合成与耐温性能研究

采用自由基水溶液聚合法成功制备了丙烯酰胺(AM)/2-甲基-2-丙烯酰胺基丙磺酸(AMPS)/N-乙烯基吡咯烷酮(NVP)三元共聚耐温型降滤失剂,通过红外(FTIR)光谱和核磁C谱表征了共聚物的结构,通过元素分析考察了共聚物组成。热失重(TGA)表明,P(AM/AMPS/NVP)耐温性优于P(AM/AMPS)和P(AM),通过对三元共聚物的抗高温性和降失水性的研究,表明P(AM/AMPS/NVP)具有良好的耐温降滤失性能。     

AM/VTMS共聚物的制备与水溶液性能研究

以乙烯基三甲氧基硅烷(VTMS)和丙烯酰胺(AM)为共聚单体,2,2-偶氮二[2-(2-咪唑啉-2-代)丙烷]二氢氯化物(VA-044)为引发剂,采用水溶液自由基聚合的方法,合成了一种新型共聚物AM/VTMS(丙烯酰胺/乙烯基三甲氧基硅烷)。考察了共聚物水溶液的性能以及对不同盐的承受能力,结果显示合成聚合物的水溶液粘度随着VTMS含量的增大而增大,在不同盐浓度的水溶液中,AM/VTMS共聚物水溶液粘度保留率高于聚丙烯酰胺(PAM)水溶液粘度保留率。     

AM/AMPS/AMC14 S共聚物的合成

采用氧化 -还原引发体系 ,合成了丙烯酰胺 (AM) 2 -丙烯酰胺基 - 2 -甲基丙磺酸 (AMPS) 2 -丙烯酰胺基十四烷磺酸 (AMC14 S)三元共聚物。用红外光谱分析了聚合物的结构 ,初步评价了共聚物的溶液性能。结果表明 ,AM AMPS AMC14 S共聚物具有较好的热稳定性和耐温抗盐能力     

共聚物阻垢剂中官能团对CaCO3的阻垢协同作用

以水为溶剂,过硫酸铵为引发剂,丙烯酸、异丙烯膦酸、丙烯酰胺为单体,分别合成了低相对分子质量的丙烯酸/丙烯酰胺(AA/AM)、异丙烯膦酸/丙烯酰胺(IPPA/AM)二元共聚物以及不同配比的丙烯酸/异丙烯膦酸/丙烯酰胺(AA/IPPA/AM)三元共聚物.用红外光谱对产物进行了表征.研究了在相同条件下,含有相同基团的共聚物阻垢剂与复配型阻垢剂以及不同组成的共聚物阻垢剂对CaCO3的阻垢性能.结果表明,同一分子链上的基团间具有较好的阻垢协同效应,且基团组成不同,其阻垢协同效应也不同.     

耐温抗盐AM/AA/AMC_(12)S共聚物的合成及性能评价

以1-十二烯、丙烯腈和发烟硫酸为原料制备了2-丙烯酰胺基十二烷磺酸(AMC12S),在此基础上又以丙烯酰胺(AM)、丙烯酸(AA)和AMC12S为原料合成了水溶性三元共聚物AM/AA/AMC12S。设计了一组正交实验,考察了单体总质量分数、AMC12S含量、引发剂含量、AM∶AA值以及温度等对共聚反应的影响,确定了三元共聚物AM/AA/AMC12S的最佳合成条件为:总单体质量分数为24%、AMC12S质量分数为0.04%、引发剂质量分数为0.1%、AM∶AA=7.0∶3.0、反应温度为40℃。通过红外光谱和扫描电镜对三元共聚物AM/AA/AMC12S进行了表征。讨论了共聚物的黏浓关系、耐温、抗盐等性能。结果表明,共聚物的增粘性远大于HPAM;90℃条件下共聚物的黏度保留率为45.0%,高于HPAM;氯化钠浓度为80 000 mg/L时,黏度保留率为14.6%,氯化镁或氯化钙浓度为2 000 mg/L时,粘度保留率分别为14.4%,12.5%。与部分水解聚丙烯酰胺(HPAM)相比,该共聚物具有良好的耐温抗盐性能。     

AM/AMPS共聚物的合成与性质研究

采用过硫酸铵和亚硫酸氢钠氧化还原体系引发丙烯酰胺(AM)和2-丙烯酰胺-2-甲基丙磺酸(AMPS)水溶液进行二元共聚,得到AM/AMPS共聚物。黄金分割法评定确定最佳合成条件为:引发剂0.002 888%,单体20%,AMPS∶AM=20∶80(质量百分比),反应温度45.52℃。用红外光谱(IR)对目标产物进行结构表征,并评价了目标物的溶液性能和稳定性。结果表明,AM/AMPS共聚物的耐温抗盐性优于大庆HPAM聚合物,适用于高温高盐油藏条件。     

P(AM-DAAM-NVP)三元共聚物的耐温抗盐性能研究

以丙烯酰胺(AM)、双丙酮丙烯酰胺(DAAM)、N-乙烯基-2-吡咯烷酮(NVP)为原料,采用水溶液聚合法合成了三元共聚物P(AM-DAAM-NVP),表征了其红外光谱特征;研究了它的热稳定性能和其溶液的特性黏数随温度的变化。结果表明,当m(AM)∶m(DAAM)∶m(NVP)=7.5∶2.0∶1.5,w(引发剂)=0.4%,聚合反应温度60℃时,得到的三元共聚物的半分解温度(T1/2)为390℃,比聚丙烯酰胺提高了14.3%;它在350℃时的失重速率(K350)为1.0%/m in,较聚丙烯酰胺的K350(1.43%/m in)下降了30.1%,耐热抗盐性能优于聚丙烯酰胺(PAM);该三元共聚物黏度保留值(B.R)均大于0.75,最大可达0.97,远大于相同条件下的聚丙烯酰胺黏度保留值(最大为0.55)。     

有机锆交联AM/DMAM/AMPS三元聚合物流变动力学

以乳酸/丙三醇有机锆为交联剂,聚合物[一种耐高温的丙烯酰胺(AM)/N,N-二甲基丙烯酰胺(DMAM)/2-丙烯酰胺基-2-甲基丙磺酸(AMPS)三元聚合物]为稠化剂,获得了耐高温聚合物凝胶.研究了聚合物凝胶的流变学特性(黏弹性、触变性)及其交联流变动力学,获得了聚合物交联过程中黏度、黏弹性模量随时间的变化关系,并考察了剪切速率和温度对凝胶形成的影响,建立了交联流变动力学模型.结果表明,交联聚合物凝胶具有明显的黏弹性和触变性;在180℃、170 s^-1下剪切120 min后,黏度达176.8 mPa·s,获得了耐高温达180℃的凝胶;一级交联流变动力学模型可拟合聚合物的交联流变动力学过程,拟合的模型参数物理意义明确合理.     

Preparation and property of 2‐acrylamide‐2‐methylpropanesulfonic acid/acrylamide/sodium styrene sulfonate as fluid loss agent for oil well cement

A novel terpolymer 2‐acrylamide‐2‐methylpropanesulfonic acid/acrylamide/sodium styrene sulfonate (AMPS/AM/SSS), used as fluid loss agent for oil well cement under high temperature, was prepared with initiator of azobisisobutryamide chloride. The optimum reaction conditions of polymerization were obtained from the orthogonal experiments, reaction temperature 40°C, initiator 0.1 wt%, molar ratio of monomers AMPS/AM/SSS 20/5/1. The structure and performance of terpolymer was characterized with Fourier transform infrared spectrometer, nuclear magnetic resonance hydrogen spectrum, thermogravimetric and simultaneous differential thermal analysis, high‐temperature and high‐pressure water loss meter, and rotational viscometer, indicating that the terpolymer was perfectly synthesized and started to decompose at 350°C and showed good performance of fluid loss control up to 160°C. The ζ‐potential instrument and scanning electron microscopy were used to investigate the mechanisms of fluid loss control, indicating that the terpolymer can prevent the generation of flocculated structure in the cement and reduce the porosity of the filter cake. These results have important referential value for developing new high‐temperature‐resisting fluid loss agents. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers     

AM/AMPS/SSS三元共聚物的制备及耐温耐盐性能

我国油田已全面进入三次采油阶段,研制适应高温高盐开采环境下的驱油剂受到广泛关注。针对传统聚丙烯酰胺类驱油剂进行了改性,采用水溶液聚合的方法,制备并优化了丙烯酰胺/2-丙烯酰胺基-2-甲基-1-丙烷磺酸/对苯乙烯磺酸钠（AM/AMPS/SSS）三元共聚物,探究了各种反应条件对产物水溶液表观黏度的影响,总结分析了相关规律,得到最优的共聚物制备条件。使用旋转黏度计,对聚合物溶液的表观黏度、耐温耐盐性能进行了研究,最终得到了耐温、耐盐效果明显,热稳定性良好的AM/AMPS/SSS三元共聚物,在目前严峻的原油开采环境中有较好的应用前景。     

Structure and properties of AN/MAA/AM copolymer foam plastics

In this article, acrylonitrile (AN)/methacrylic acid (MAA)/acrylamide (AM) copolymer foam was prepared. DSC, TG and FTIR were adopted to analyze the chemical reactions in AN/MAA/AM copolymer foam, and confirm its molecule structure. SEM was employed to observe its cell structure, and the calculational method of resin distribution was founded basing on dodecahedron cell structural model. At last, its mechanical properties and thermal resistance were tested. The results indicate that cyclization reactions occur between adjacent AN/MAA units and MAA/AM units. Six-member imide rings, residuary MAA and AN units exist in main chains, and imide groups crosslink the chains. AN/MAA/AM copolymer foam has flat and closed cell walls with a high cell wall volume ratio. Cell wall volume ratios with the density of 32 kg/m³, 54 kg/m³ and 75 kg/m³ are 76%, 57% and 50% respectively. Because of rigid molecule structure and ideal cell structure, AN/MAA/AM copolymer foam possesses excellent mechanical properties and thermal resistance. As the densities are 32 kg/m³, 54 kg/m³ and 75 kg/m³, tensile strength are 1.00 MPa, 1.85 MPa and 2.30 MPa, compressive strength are 0.40 MPa, 1.00 MPa and 1.72 MPa, and shear strength are 0.45 MPa, 0.86 MPa and 1.29 MPa respectively. Heat distortion temperature of the copolymer foam is higher than 180 °C.     

A water‐soluble acrylamide hydrophobically associating polymer: Synthesis,characterization, and properties as EOR chemical

A water‐soluble acrylamide hydrophobically associating terpolymer for polymer flooding was successfully synthesized via free radical polymerization using acrylamide (AM), acrylic acid (AA), and N,N‐divinylnonadeca‐1,10‐dien‐2‐amine (DNDA) as raw materials. The terpolymer was characterized by IR spectroscopy and fluorescence spectra. Compared with partially hydrolyzed polyacryamide (HPAM), the terpolymer showed a stronger link and better dimensional network structure under the environmental scanning electron microscope (ESEM). The results of rheology indicated that the terpolymer (AM‐NaAA‐DNDA) showed an excellent shear‐resistance in high shear rate (1000 s^?1) and remarkable temperature‐tolerance (above 110°C). The salt‐resisting experiment revealed that this terpolymer had a better anti‐salt ability. According to the core flooding test, it could be obtained that oil recovery was enhanced more than 15% under conditions of 2000 mg/L terpolymer in the mineralization of 8000 mg/L at 60°C. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

支化与交联型聚氨酯弹性体的合成与性能分析

为提高聚氨酯弹性体力学性能和耐热性,本文以聚己二酸二乙二醇酯二醇、二苯基甲烷二异氰酸酯和 1,4-丁二醇为原料,以聚氧化丙烯三醇（PPG-3）或丙三醇为支化单体,并通过调控其添加量（1%、3%和5%,相对于PDGA-2000的摩尔分数）,采用本体预聚物法合成支化或交联型聚氨酯弹性体。与线型聚氨酯相比,支化聚氨酯具有较高机械强度和耐热性。添加3% PPG-3所制备支化聚氨酯的拉伸强度提高170%（33.9MPa）,撕裂强度提高36%（90.7MPa）,维卡软化点温度为95.1℃;然而,5%的丙三醇引发交联结构的形成,交联型聚氨酯的拉伸强度提高154%（31.8MPa）,撕裂强度提高26%（84.4MPa）,维卡软化点温度为150.6℃。此外,PPG-3和丙三醇发挥聚氨酯软段和硬段相容剂的作用,抑制微相分离,使聚氨酯弹性体的橡胶平台增大。动态流变行为测试结果表明,支化和交联型聚氨酯弹性体具有更高的弹性模量和复数黏度。     

新型孪尾疏水改性聚合物／表面活性剂的溶液性能研究

采用前加碱胶束共聚-共水解法制备了丙烯酰胺、丙烯酸钠和新型孪尾疏水单体N,N-二正辛基丙烯酰胺的三元共聚物P(AM/NaAA/DiC8AM),利用FTIR和1H-NMR确定了共聚物的结构,测定了共聚物/表面活性剂复合体系水溶液的表观粘度,研究了表面活性剂种类、温度、电解质、剪切速率等因素对复合体系溶液表观粘度的影响。P(AM/NaAA/DiC8AM)/SDS和P(AM/NaAA/DiC8AM)/CTAB复合体系的溶液表观粘度与HPAM共聚物溶液相比有明显的提高,疏水单体含量越大,复合体系的溶液表观粘度越大,且其溶液具有一定的耐温、耐盐和抗剪切性。     

Synthesis,characterization, rheological properties and hydrophobic nano-association of acrylamide/styrene and acrylamide/sodium styrene sulfonate/styrene co- and terpolymers

Hydrophobically modified polyacrylamides (HMPAMs) are used as rheological modifier and thickening agent, for example, in enhanced oil recovery, drilling fluids and dying technology. In this work, acrylamide/ styrene (AM/St) copolymers and AM/St/ sodium styrene sulfonate (AM/St/SSS) terpolymer were synthesized by heterogeneous and micellar radical copolymerization methods. Final copolymer composition was determined using ¹H-NMR spectroscopy. In comparison to initial mole fraction of St (0.0137), mole fraction of St incorporated into the copolymer chains for heterogeneous sample decreased to 0.0093 while that for micellar sample increased to 0.01386. Microstructures of the synthesized samples were investigated by calculating sequence length of the hydrophobic (St) and hydrophilic monomers. Depending on the polymerization conditions, viscosity- average molecular weight of the synthesized samples varied in the range of 4?×?10⁵ g.mol^?1 and 1?×?10⁶ g.mol^?1. In the heterogeneous copolymerization method, St was incorporated randomly into the copolymer chains while in micellar copolymerization method, a multi-block distribution of St in the copolymer chain was observed. Strong thickening behavior was observed by increasing copolymer concentration and NaCl concentration. Among other co- and terpolymers, AM/St/SSS revealed the best rheological and thermal properties. Shear thinning behavior was observed for all co- and terpolymers. It was found that rheological properties of the synthesized HMPAMs can be affected significantly by the microstructural parameters and hydrophobic interchain nano-association.     

丙烯酰胺/甲基丙烯酰氧乙基三甲基氯化铵/二甲基二烯丙基氯化铵三元聚合物的表征与溶液性质

以丙烯酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)、二甲基二烯丙基氯化铵(DMDAAC)为单体原料,采用水溶液聚合技术制备了粉末型阳离子三元聚合物P(AM/DMC/DMDAAC)。采用红外光谱、核磁共振和热重分析对所制备阳离子聚合物进行了结构和组成表征,并利用电导率仪和布氏黏度计对其溶解性及其溶液黏度进行了测定。结果表明:合成的产物为P(AM/DMC/DMDAAC),具有良好的热稳定性和溶解性。三元聚合物的表观黏度随着聚合物质量浓度的增加先减小后增加,随剪切速率的增加而下降。在不同的外加盐溶液里,三元聚合物溶液表现出明显的反聚电解质行为。