PDADMAC与低分子量聚丙烯酸钠复合物的制备与性能

本文对强阳电性的聚=烯丙基二甲基氯化铵（PDADMAC）和弱阴电性的低分子量的聚丙烯酸钠的复合物进行了研究。通过粒子电荷滴定仪、分光光度计和粒度仪研究了这种聚电解质复合物的电荷滴定特点、复合物吸光度随聚电解质比例的变化以及复合物的粒度特点，并利用透射电镜观察了复合物粒子的特征。     

Poly-DMDAAC的合成及其在喷墨打印纸中的应用

应用实验室最佳实验方案,利用二步法合成了二烯丙基二甲基氯化铵,然后采用自由基溶液聚合法聚合生成聚二烯丙基二甲基氯化铵.将合成的聚二烯丙基二甲基氯化铵作为阳离子添加剂应用于彩色喷墨打印纸涂层中并测定成纸的各项性能.     

重硫氧与复合高分子絮凝剂在赤砂糖脱色中的应用

研究了重硫氧与复合高分子絮凝剂对复溶赤砂糖脱色的效果。运用均匀试验得出各因素对色值的影响大小顺序：聚二甲基二烯丙基氯化铵用量〉温度〉重硫氧用量〉聚硅酸硼锌用量〉pH值；最佳工艺条件为：重硫氧用量0．20g，聚二甲基二烯丙基氯化铵用量1．0ml，聚硅酸硼锌用量0．12ml，pH值7.0，温度70℃。复溶赤砂糖汁脱色率达到41％。     

聚阳离子固色剂的合成及固色机理

选用单体二甲基二烯丙基氯化铵和二烯丙基胺为原料,以环氧氯丙烷(ECH)为交联剂,偶氮二异丁腈(AIBN)为引发剂,合成一种聚阳离子固色剂.考察反应温度、原料配比、引发剂用量、冰醋酸用量、交联剂用量对耐汗渍色牢度的影响.结果 表明:当反应温度为75℃、二甲基二烯丙基氯化铵与二烯丙基胺质量比为100:7、引发剂用量为0.1...     

二甲基二烯丙基氯化铵聚合物在纺织印染中的应用

简述了二甲基二烯丙基氯化铵单体及其相关聚合物的制备方法，介绍了聚二甲基二烯丙基氯化铵及其衍生物产品在纺织印染行业中作为抗静电剂、固色剂和絮凝剂的应用.     

聚二烯丙基二甲基氯化铵的合成及其在喷墨打印纸中的应用

采用实验室最佳实验方案,利用二步法合成了二烯丙基二甲基氯化铵.第一步反应中m(二甲胺):m(烯丙基氯):m(氢氧化钠)为1.2:1.0:1.0;第二步中m(叔胺):m(烯丙基氯)为1.0:1.0.然后采用自由基溶液聚合法生成聚二烯丙基二甲基氯化铵.将合成的聚二烯丙基二甲基氯化铵作为阳离子添加剂应用于彩色喷墨打印纸涂层中并测定成纸的各项性能.     

聚二甲基二烯丙基氯化铵-二烯丙基胺固色剂的研究进展

聚阳离子型固色剂由聚二甲基二烯丙基氯化铵(PDADMAC)逐渐发展至共聚改性聚阳离子型固色剂,目的是弥补单一阳离子单体均聚物本身的不足.重点阐述聚二甲基二烯丙基氯化铵-二烯丙基胺固色剂(PDADMAC-DAA)的研究进展,并结合实际生产中固色剂的应用情况,从聚合机理、工艺控制和固色机理3方面展开详细论述.     

AKD熟化促进剂PDADMAC的合成与应用

天津科技大学天津市制浆造纸重点实验室梁聪慧等人采用水溶液聚合法,以二甲基二烯丙基氯化铵（DADMAC）为单体,采用氧化还原引发体系的自由基聚合反应,合成具有高电荷密度、高黏度的聚二甲基二烯丙基氯化铵（PDADMAC）。并探究了反应温度、引发剂用量、引发剂滴加时间等因素对合成PDADMAC特性黏度和电荷密度的影响;     

回溶赤砂糖絮凝实验中简纯度影响因素的研究

在蔗糖或糖品分析中,简纯度是一个重要的被测参数,简纯度的高低是糖品质量的重要标志,因此,提高赤砂糖的简纯度对于提高糖厂的经济效益有很重要的意义。本文研究了重硫氧与复合高分子絮凝剂对复溶赤砂糖简纯度的效果。运用均匀试验和网格优化法得出各因素对糖汁简纯度的影响大小顺序:聚二甲基二烯丙基氯化铵用量>温度>重硫氧用量>聚硅酸硼锌用量>pH值;最佳工艺条件为:重硫氧用量0.15g,聚二甲基二烯丙基氯化铵用量0.6ml,聚硅酸硼锌用量0.12ml,pH值6.5,温度85℃。     

DMDAAC/木素磺酸钠接枝共聚物的制备及应用

以二甲基二烯丙基氯化铵(DMDAAC)与木素磺酸钠为原料,合成了两性水煤浆分散剂,探讨DMDAAC用量、引发剂用量、反应时间、反应温度对水煤浆性能的影响。用差示紫外光谱法测定了产物LD和LS的酚羟基含量,进一步验证了接枝聚合的反应机理;通过凝胶渗透色谱(GPC)测定了其分子量以及分子量分布的变化,并通过扫描电镜(SEM)对接枝聚合产物的外观形貌做出了分析。对接枝聚合产物做水煤浆性能测试,表明产物具有更好的流变性能以及静态稳定性。     

TiO2-沸石复合纸板制备中助留剂的作用

考察了TiO2-沸石复合纸板制备中聚二甲基二烯丙基氯化铵(PDADMAC)/阴离子聚丙烯酰胺(APAM)和阳离子淀粉/APAM二元助留体系助留效果。结果表明:PDADMAC/APAM二元助留体系对TiO2、沸石等无机物的助留效果显著,纸料和无机物的最高留着率分别达88.8%和83.0%。PDADMAC或APAM单元体系、阳离子淀粉/APAM二元助留体系的作用效果差。     

Improvement of stability of oil-in-water emulsions containing caseinate-coated droplets by addition of sodium alginate

ABSTRACT:  The potential of sodium alginate for improving the stability of emulsions containing caseinate-coated droplets was investigated. One wt% corn oil-in-water emulsions containing anionic caseinate-coated droplets (0.15 wt% sodium caseinate) and anionic sodium alginate (0 to 1 wt%) were prepared at pH 7. The pH of these emulsions was then adjusted to 3.5, so that the anionic alginate molecules adsorbed to the cationic caseinate-coated droplets. Extensive droplet aggregation occurred when there was insufficient alginate to completely saturate the droplet surfaces due to bridging flocculation, and when the nonadsorbed alginate concentration was high enough to induce depletion flocculation. Emulsions with relatively small particle sizes could be formed over a range of alginate concentrations (0.1 to 0.4 wt%). The influence of pHs (3 to 7) and sodium chloride (0 to 500 mM) on the properties of primary (0 wt% alginate) and secondary (0.15 wt% alginate) emulsions was studied. Alginate adsorbed to the droplet surfaces at pHs 3, 4, and 5, but not at pHs 6 and 7, due to electrostatic attraction between anionic groups on the alginate and cationic groups on the adsorbed caseinate. Secondary emulsions had better stability than primary emulsions at pH values near caseinate's isoelectric point (pHs 4 and 5). In addition, secondary emulsions were stable up to higher ionic strengths (< 300 mM) than primary emulsions (<50 mM). The controlled electrostatic deposition method utilized in this study could be used to extend the range of application of dairy protein emulsifiers in the food industry.     

阳离子水溶性聚合物对松香的乳化增效作用

就聚酰胺多胺环氧氯丙烷(PAE)、阳离子淀粉(CS)以及聚二烯丙基二甲基氯化铵(PDADMAC)3种阳离子水溶性聚合物对松香的乳化增效作用进行了初步探讨.实验结果表明,此3种聚合物能够在降低低分子表面活性剂用量(用量降至13.0%)并在减轻低分子表面活性剂负面影响的基础上,对松香起到较为显著的乳化增效作用.     

Plant protein interactions with polysaccharides and their influence on legume protein functionality A Review

Associative interactions between proteins and polysaccharides, both coulombic and non‐coulombic, lead to the formation of interpolymer complexes. Complex formation with charged polysaccharides, either anionic or cationic, imparts solubility to seed globulins in the vicinity of their isoelectric points. This has been shown for the complexes “sunflower 11 S globulin (helianthinin) – sodium alginate” and “faba bean legumin (or the product of its limited proteolysis with trypsin – legumin‐T) – chitosan”. Hysteresis effects allow to control the solubility of seed globulins in weakly acid or weakly basic media. Formation of soluble complexes of faba bean legumin or legumin‐T with chitosan substantially increases the emulsion stability of the both proteins.     

Protection of ovalbumin against irreversible heat denaturation by a cationic amphiphile at high concentration

The interaction of the cationic amphiphile cetylpyridinium chloride (CPC) with the egg white protein ovalbumin, was studied at various temperatures and pH values. The influence of different concentrations of CPC on the thermal behaviour of the protein was followed by specific optical rotation measurements in the pH interval 3-9. No increase in optical rotation was found at any pH when CPC was added to ovalbumin at room temperature. When heated, a gradual increase in optical rotation was registered, which became smaller the higher the pH used. At molar ratios of CPC :ovalbumin of above 70 this increase was reversed on cooling. The reversibility of the thermal unfolding on cooling was not affected by a variation in protein concentration between 0.5 and 10%. Circular dichroism measurements before and after a heating-cooling cycle confirmed the results obtained on optical rotation. When CPC was exchanged against the anionic amphiphile, sodium dodecylsulphate (SDS), a denaturing effect was achieved at neutral and alkaline pH values already at room temperature. At the acidic side of the isoelectric point, however, there was no major effect of SDS. No thermal aggregation of ovalbumin occurred near the isoelectric point when CPC was present and complete resolubility was found after thermal treatment and drying.     

棉织物超细涂料印花性能的改善

1.2 阳离子化改性处理 调节改性处理液的pH值,使织物浸渍存浴比为30:1的CHTAC(20～80 g/L)改性液中进行阳离子改性.温度升至80℃,保温45 min,取出,40℃水洗,2 g/L的醋酸中和洗涤,冷水洗,最后在60℃下烘干.     

阳离子微粒氢氧化镁铝的合成及其微粒助留作用

混合二元金属氢氧化物是自然界中唯一带有正电荷的粘土矿物,可望与阴离子聚丙烯酰胺组成阳离子微粒助留体系.本文采用共沉淀法合成了以Cl-为层间阴离子、以不同摩尔比的镁、铝为金属阳离子的混合二元金属氢氧化物一氢氧化镁铝胶体,并对其化学结构式、粒度、Zeta电位等进行了分析,研究了氢氧化镁铝对苇浆的微粒助留作用.结果表明,氢氧化镁铝在从酸性到碱性的抄纸pH值范围内均带有正电荷,其带电情况和粒度随镁铝摩尔比而变化.各镁铝摩尔比不同的氢氧化镁铝与阴离子聚丙烯酰胺均可组成有效的阳离腚子微粒助留体系,且阳离子氢氧化镁铝的粒度越小,其微粒助留作用越好.     

制革中的电化学应用初探

在无膜、阳离子膜和阴离子膜的电解槽中,通85mA的直流电1h后,探讨直流电对酸皮等电点、酸皮的湿热稳定性、酸皮的铬吸收性、蓝皮的染料和加脂剂吸收性的影响。研究发现,在无膜和阳离子膜时,酸皮的等电点有所降低,有阴离子膜时,等电点上升;阴离子膜正极区,酸皮的耐湿热稳定性提高得最多;阳离子膜正极区,酸皮对铬的吸收最高;阳离子膜负极区染料的吸收率最高;无膜电解时,坯革对磺化油的吸收最好。     

Plant protein interactions with polysaccharides and their influence on legume protein functionality. A review.

Associative interactions between proteins and polysaccharides, both coulombic and non-coulombic, lead to the formation of interpolymer complexes. Complex formation with charged polysaccharides, either anionic or cationic, imparts solubility to seed globulins in the vicinity of their isoelectric points. This has been shown for the complexes "sunflower 11 S globulin (helianthinin)--sodium alginate" and "faba bean legumin (or the product of its limited proteolysis with trypsin--legumin-T)--chitosan". Hysteresis effects allow to control the solubility of seed globulins in weakly acid or weakly basic media. Formation of soluble complexes of faba bean legumin or legumin-T with chitosan substantially increases the emulsion stability of the both proteins.