二甲基二烯丙基氯化铵-丙烯酰胺共聚物的合成及其吸水性能研究

选择二甲基二烯丙基氯化铵(DMDAAc)、丙烯酰胺(AM)为共聚单体,过硫酸钾为引发剂,N,N'-亚甲基双丙烯酰胺(NMBA)为交联剂,乙二胺四乙酸二钠为助剂,通过逐渐滴加单体与引发剂的方法进行聚合反应,合成了二甲基二烯丙基氯化铵-丙烯酰胺共聚物。探索了合成的最佳工艺条件,并对合成的目标产物进行了红外光谱表征,确保合成产物结构的正确性;对共聚物进行了热性能测试,5%热分解温度均大于260.6oC;吸水性能测试表明,共聚物对去离子水和0.9%NaCl水溶液吸水倍率可分别达318、69.2g/g。     

聚二烯丙基二甲基氯化铵-丙烯酰胺改性蒙脱土的研究

制备了系列数均分子量为5500、6000、8500和20000的聚二烯丙基二甲基氯化铵-丙烯酰胺;对聚合物进行纯化处理后,采用提纯聚合物、未提纯聚合物和质子化后的提纯聚合物进行钠基蒙脱土的改性;选用数均分子量为6000的提纯聚合物进行了不同用量聚合物改性钠基蒙脱土的研究。结果表明,本实验条件下制备的提纯聚合物能够顺利进行蒙脱土插层;聚合物中未反应单体的存在不利于聚合物大分子插层蒙脱土;对聚合物进行质子化处理后,其对蒙脱土的插层无明显影响;提纯PDM-AM聚合物(6000Mn)改性蒙脱土的层间距随聚合物用量的增加而增大;当聚合物用量为1.4CEC时,聚合物改性蒙脱土XRD谱图中的衍射峰宽化。     

二甲基二烯丙基氯化铵与丙烯酰胺的共聚动力学

采用膨胀计法研究了以过硫酸铵-亚硫酸氢钠为引发剂的二甲基二烯丙基氯化铵(DMDAAC)和丙烯酰胺(AM)的水溶液共聚合动力学,测定了相应的聚合速率方程、聚合表观活化能和单体竞聚率。结果表明,聚合反应温度为45℃,当DMDAAC与AM物质的量比分别为1∶9,2∶8和3∶7时,共聚速率方程分别为Rp1=k[M]2.61[IO]0.51[IR]0.52,Rp2=k[M]2.70[IO]0.50[IR]0.53和Rp3=k[M]2.73[IO]0.50[IR]0.56,表观活化能分别为Ea1=79.10 kJ/mol,Ea2=81.39 kJ/mol和Ea3=85.15 kJ/mol,两单体的竞聚率分别为rDMDAAC=0.14,rAM=6.11。上述实验结果可从动力学角度为不同阳离子度PDA聚合速率差别及产物特征黏度值差异进行解释。     

二甲基二烯丙基氯化铵-丙烯酰胺共聚物的合成与溶液性质

合成了阳离子单体N，N-二甲基二烯丙基氯化铵(DMDAAC)及其与丙烯酰胺(AAM)的共聚物，对单体及共聚物的合成方法进行了概述，并探讨了此阳离子型共聚物的稀溶液性质，包括导电性质和粘性行为。     

二甲基二烯丙基氯化铵聚合物的研究进展及应用

二甲基二烯丙基氯化铵(DMDAAC)是一种水溶性阳离子型季铵盐,其均聚物和共聚物都具有正电荷密度高、相对分子质量易于控制、高效价康等优点,可广泛应用于油田、造纸、水处理、医药和化妆品等领域,引起国内外普遍关注.介绍了DMDAAC聚合物的结构及性质,综述了DMDAAC聚合物的合成方法、类型以及研究应用现状,并展望了今后的研究重点和方向.     

聚二甲基二烯丙基氯化铵合成及与牛血清蛋白络合表征研究

用过硫酸盐氧化还原体系在一定条件下合成的聚二甲基二烯丙基氯化铵（PDADMAC）高聚物是具有多种用途的离子型功率高分子材料，可作为生物高分子材料应用于医学技术上，并可与蛋白质进行络合，通过紫外吸收光谱法测定出一定环境下此高聚物与牛血清蛋白（BSA）的络合比，并观察了pH值和离子浓度对络合的影响。     

聚二甲基二烯丙基氯化铵/偶联剂改性膨润土对苯酚的吸附研究

采用阳离子聚电解质聚二甲基二烯丙基氯化铵(PDMDAAC)和硅烷偶联剂(KH550)对钙基膨润土进行改性,得到有机改性膨润土.研究发现,PDMDAAC和KH550成功负载在膨润土表面,其结构没有发生改变.以苯酚为吸附对象,采用该有机改性膨润土对其进行模拟吸附,当有机改性膨润土的投加量为2g/L,吸附时间20min,pH...     

尼龙纤维增强聚乙烯醇/聚二烯丙基二甲基氯化铵阴离子交换膜的制备与性能研究

以五种不同聚乙烯醇/聚二烯丙基二甲基氯化铵配比制备了用于电透析脱盐的尼龙纤维增强的阴离子交换膜,并考察四种不同交联剂浓度的条件下对膜的性能参数:膜含水率、迁移数、膜电荷密度及膜面电阻的影响.实验结果表明:膜的含水率随聚二烯丙基二甲基氯化铵含量的增加而增加,随交联剂GA浓度的增加而降低;在wPC=30%,φGA=0.05%时阴离子交换膜的膜电阻最低,且为4.46Ω.cm2;在wPC=30%,φGA=0.3%时阴离子交换膜的动态迁移数达到0.99;在wPC=20%,φGA=0.3%时阴离子交换膜的膜电荷密度值为1.24mol/dm3.     

三甲基烯丙基氯化铵—丙烯酰胺共聚物的合成与结构表征

报道了三甲基烯丙基氯化铵的制备及其与丙烯酰胺的共聚，对ＴＭ的合成条件进行了探讨，对引发体系、温度，单体配比对共聚反应的影响进行了研究，并用ＩＲ、ＮＭＲ、差热分析及化学分析方法对其结构进行了表征。     

Fe2+-H2O2引发淀粉-二甲基二烯丙基氯化铵接枝共聚的研究

采用Fe^2 -H2O2氧化还原引发体系进行淀粉与二甲基二烯丙基氯化铵（DMDAAC）接枝聚合，制备了一系列分子中含有阳离子季铵基团的淀粉－DMDAAC接枝共聚物。研究了单体浓度，引发剂用量，反应温度对接枝体系的接枝率，接枝效率，单体转化率和阳离子度等因素的影响，探讨了Fe^2 -H2O2引发淀粉接枝DMDAAC共聚反应的基本规律。并用IR和^1H-NMR对接枝共聚物进行了分析表征。     

DMDAAC在蒙脱土中插层环化聚合及其应用的研究

首先采用单因素试验优化了聚二烯丙基二甲基氯化铵(PDM DAAC)的合成工艺;选用二烯丙基二甲基氯化铵(DM DAAC)在不同用量的蒙脱土中插层环化聚合,制备了系列纳米复合材料(PDM DAAC/MM T);对纳米复合材料进行了X射线衍射(XRD)测试;通过单体转化率和聚合物的特性黏度考察不同用量的蒙脱土对单体环化聚合的影响;将纳米复合材料用于皮革预鞣,再进行2%标准铬粉鞣制的试验初试。XRD、单体转化率和聚合物的特性黏度测定结果表明:蒙脱土的用量为5%时,蒙脱土的层间距、单体转化率、聚合物的特性黏度均达到最大值。纳米复合材料预鞣结果表明,蒙脱土用量为4%时,纳米复合材料对坯革的增强效果最明显。     

Synthesis of silver/poly (diallyldimethylammonium chloride) hybride nanocomposite

This paper presents a method for the preparation of silver nano-particles in poly (diallyldimethylammonium chloride) (PDDA) using N,N-dimethylformamide (DMF) as a medium has been performed successfully. A golden solution in its UV–vis absorption spectrum showed surface plasmon resonance absorption bands between 410 and 425 nm in solutions and at about 461 nm in a transparent film. The Ag/PDDA nano-composite was characterized by X-ray diffraction (XRD) measurement, transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier-transform-infrared spectroscopy (FT-IR) and thermo-gravimetric analysis (TGA). XRD showed the fcc crystal structure of the bulk Ag with particles of <22 nm in size similar to that is observed by TEM and PDDA is crucial to the formation of such silver nano-composite. SEM indicated uniform distribution of particles in the film. TGA confirmed enhanced thermal stability of the polymer.     

Study of the polyvinyl chloride polymer structure in relation to migration of residual vinyl chloride monomer by inverse gas chromatography

The polyvinyl chloride (PVC) polymer structure was studied using inverse gas chromatography (IGC). The specific retention volume (Vg°) of a vinyl chloride monomer (VCM) probe, as well as the thermodynamic parameters of the interaction between PVC and VCM were calculated. Changes in Vg°, free energy(ΔG°_s), enthalpy (ΔH°_s) and entropy (ΔS°_s) observed as the temperature and the amount of VCM decreased, clearly indicate that the PVC—VCM interaction was both concentration and temperature dependent. The Vg° and thermodynamic parameters also varied with changes in polymer structure. Data were interpreted in terms of the active site hypothesis. Active sites in the PVC matrix strongly bind VCM at low enough concentrations and temperatures. Inferably, migration of VCM from PVC packaging materials containing very low concentrations of residual monomer should be for all practical purposes, essentially zero, particularly at low temperatures.     

DM-AM、TM-AM共聚反应竞聚率EI

通过阳离子单体：二甲基二烯丙基氯化铵（ＤＭ）、三甲基烯丙基氯化铵（ＴＭ），分别与丙烯酰胺（ＡＭ），用Ｎａ２Ｓ２Ｏ８－Ｎａ２ＳＯ３引发剂引发，在水溶液中不同单体摩尔比条件下的自由基共聚合，分别用直线交点法、Ｆｉｎｅｍａｎ－Ｒｏｓｓ法和Ｍａｙｏ－Ｌｅｗｉｓ积分法测定了两种阳离子共聚物ＤＭ－ＡＭ、ＴＭ－ＡＭ共聚反应单体竞聚率。     

Preparation of multi-functional fabric via silver/reduced graphene oxide coating with poly(diallyldimethylammonium chloride) modification

In order to obtain multi-functional textile, polyester (PET) fabric was modified with poly(diallyldimethylammonium chloride) (PDDA) followed by silver/reduced graphene oxide (Ag/RGO) coating through chemical reduction method. The Ag/RGO coated PET fabrics were systematically characterized by X-ray photoelectron spectroscopy, scanning electron microscope and X-ray diffraction. The deposit weight, electrical resistance, static voltage half-life period, heat generation and water contact angle tests of the fabrics with and without PDDA modification were evaluated. It is concluded that there are uniform and dense silver particles and reduced graphene oxide (RGO) sheets deposit on the surface of the PET fabric modified with PDDA. Compared with the coated fabric without PDDA modification, the Ag/RGO coated PET fabric modified with PDDA shows lower electrical resistance of 0.173 Ω/sq, excellent antistatic property with half-life period of 0.5 s, heat generation with temperature keeping to 69.6 °C at voltage of 4 V and hydrophobicity with a water contact angle of 140.1°. Furthermore, the PDDA modification improves adhesion between Ag/RGO coating and PET substrate. In addition, electromagnetic interference (EMI) shielding effectiveness (SE), absorption and reflection characteristics were determined by a vector network analyzer in 1 GHz–18 GHz X-band range. The results exhibit that Ag/RGO coated PET fabric possesses an excellent EMI SE ranging from 52 to 57 dB and could be used as lightweight and flexible electromagnetic absorption materials.     

对异丙基氯化镁格氏试剂制备方法的研究

用镁和氯代异丙烷为原料,四氢呋喃作溶剂,在一定条件下合成了格氏试剂,格氏试剂的收率达90%以上。探讨了各种因素对合成格氏试剂的影响。     

甲基丙烯酰氧乙基三甲基氯化铵和丙烯酰胺的光辅助引发聚合

以丙烯酰胺(AM)和甲基丙烯酰氧乙基三甲基氯化铵(DMC)为原料,在金属卤化物灯照射和引发剂作用下,通过水溶液聚合法合成阳离子型聚丙烯酰胺P(AM-DMC)。考察了单体质量分数、引发温度、引发剂质量分数、溶液pH值和单体配比等对聚合物特性黏数和溶解性的影响。在单体质量分数30%,阳离子度10%～30%,引发剂质量分数0.0048%,pH值4,引发温度15℃条件下,产物的特性黏数可达10dL/g以上,溶解时间低于40min。用红外光谱对聚合物的结构进行了确认。     

共聚物水凝胶温度及pH敏感行为的研究

用自由基聚合法合成了NVP／HEMA和NVP／HEMA／AAm共聚物水凝胶材料,研究了温度、pH值、离子强度等因素对凝胶溶胀性能的影响。结果表明水凝胶的溶胀度随着温度的升高而减少;水凝胶在酸性溶液中溶胀,在碱性溶液中收缩,显现出良好的pH值敏感性;水凝胶的溶胀度随着离子强度的增加而减少。     

Surface modification of polyvinyl chloride towards blood compatibility

The surface modification of medical grade polyvinylchloride (pvc) from various sources with the ionic bonding of polyelectrolyte is investigated by exposing thepvc sheets to 1% zephiran chloride for 10 min and then to 50 mg% solution of polyelectrolyte for 10 min. Surface energy and platelet adhesion studies were carried out to demonstrate the suitability of our improved surface towards blood compatibility. Relative changes due toγ-irradiation are also discussed.