乳液共聚法制备膨润土无机凝胶改性丙烯酸酯聚合物

将膨润土无机凝胶(SMP)制成水分散液,加入含有丙烯酸的可聚合性单体,通过乳液共聚法可以制得稳定的SMP改性丙烯酸酯聚合物乳液。它具有极好的抗电解质能力,并体现出了与乳液中直接掺混SMP明显不同的性质。含3%SMP改性的聚合物乳液,可以在保持聚合物弹性和柔韧性不变的前提下,将拉伸强度提高20%左右,但SMP的加入增大了聚合物材料的吸水性。     

有机硅改性丙烯酸酯乳液及涂料性能的研究

本文论述了有机硅-丙烯酸酯共聚乳液和涂料的制备方法，对不同单体组合体系合成的乳液和涂料性能进行了对比，还研究了有机硅功能单体用量对涂料性能的影响。     

环氧改性苯丙乳液的制备及性能研究

研究了环氧树脂改性苯丙乳液的合成工艺以及乳化剂、引发剂、环氧树脂、功能单体用量等条件对反应过程及乳液性能的影响。通过实验得到阴离子与非离子乳化剂配比为1．5：1、引发剂的用量为0．6％、功能单体MAA的用量为2％、环氧树脂的用量为5％。合成的环氧改性苯丙乳液,在耐水性、耐碱性、Ca2＋稳定性方面有了明显提高。     

PAPI改性大豆蛋白复合材料的制备与性能研究

以大豆分离蛋白（SPI）和多亚甲基多苯基异氰酸酯（PAPI）为原料,制备了改性大豆蛋白,再加入聚己内酯（PCL）,经过模压成型制备了改性大豆蛋白复合材料,并对其力学性能、微观结构和热性能进行了表征。结果表明,随着PAPI的加入,材料的力学性能得到很大程度的改善,拉伸强度由9.65 MPa上升到32 MPa,冲击强度由1.36 kJ/m2提高到11.7 kJ/m2;随着PAPI的加入,大豆蛋白材料的吸水性也有明显的改善,24 h吸水率从33.89 %下降到9.77 %;红外光谱分析表明,PAPI可以与大豆分离蛋白发生反应,改变了大豆蛋白的结构,并影响其性能,使复合材料内部结构更加致密。     

丙烯酰胺改性丙烯酸酯乳液的合成及性能研究

通过预乳化半连续法制备了丙烯酰胺(AM)改性的丙烯酸酯乳液,探讨了功能单体AM用量对丙烯酸酯乳液和乳液胶膜性能的影响。结果表明:当AM用量为单体质量的1.0%时,乳液及乳液胶膜的综合性能最好。此时,功能单体AM改性的丙烯酸酯乳液聚合稳定性和转化率有所提高;乳液胶膜的力学性能有较大幅度的提高,吸水率有一定程度的降低。     

PVAC乳液的制备及改性研究

本文针对普通PVAC乳液的主要缺点,经实验筛选出新的配方及相应的工艺条件,并对其进行改性试验,找到一种效果很好的改性剂TDI,使这个老产品具有优异的使用性能。     

有机硅改性丙烯酸乳液性能的研究

采用含乙烯基官能团的有机硅单体与甲基丙烯酸酯、丙烯酸酯和丙烯酸羟基酯等单体通过种子乳液聚合方法进行共聚,合成了有机硅改性丙烯酸酯共聚乳液,考察了有机硅单体用量对乳液机械稳定性、热稳定性、电解质稳定性和冻融稳定性的影响,同时还考察了乳液胶膜的机械性能和吸水率改进。     

有机硅改性丙烯酸乳液的合成及性能

介绍了有机硅改性丙烯酸乳液的制备方法，分析了乳化剂、功能性单体、温度等因素对聚合反应转化率及乳液性能的影响。     

KH560改性水性硝化纤维乳液的制备及性能

以硝化纤维(NC)、异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸(DMPA)等为主要原料,制得自乳化型水性硝化纤维乳液,再加入可水解自交联的硅烷偶联剂KH560,其分子中的环氧基与羧基反应,从而制备出KH560改性水性硝化纤维乳液。通过傅里叶变换红外光谱(FT-IR)、透射电子显微镜(TEM)、热重分析(TGA)法等测试手段,研究了KH560和DMPA的含量对乳液及其涂膜性能的影响。结果表明:当w(KH560)=7%,w(DMPA)=3.5%时,改性后的乳液具有良好的稳定性,涂膜的耐水性、耐乙醇性、热性能、力学性能均得到明显改善。     

Rheological properties of emulsions containing modified soy protein isolates

The feasibility of replacing common emulsifiers with soy protein isolates (SPI) in low-calorie salad dressings was evaluated. Structural modifications of SPI were obtained by thermal-acidic treatment with or without neutralization (TH1.6N and TH1.6, respectively). Modification of flow properties of TH1.6 and TH1.6N emulsions by thermal treatment and different protein concentrations was evaluated through shear stress vs. shear rate measurements in a rotational viscometer. TH1.6N isolates generated emulsions with higher shear stress and apparent viscosity than those prepared with TH1.6. Heated TH1.6N emulsions at 10% protein gave the highest values of shear stress and plastic flow behavior. These emulsions had high consistency, viscosity, and elasticity. TH1.6N isolates had lower emulsifying capacity than TH1.6, probably due to the higher protein aggregation produced during neutralization, which prevented protein unfolding. These isolates would be suitable for the preparation of stable emulsions with adequate consistency and elasticity.     

核桃蛋白-低聚半乳糖复合纳米颗粒的制备及其Pickering乳液性质

以核桃蛋白（WalPI）和低聚半乳糖（GOS）为原料,采用pH循环-超声联合制备WalPI-GOS,并将其与茶油混合,制备Pickering乳液。通过FTIR、粒径分析表征WalPI-GOS的结构、粒径分布,通过荧光吸收光谱、DSC和内源荧光光谱等测定WalPI-GOS的游离巯基含量、热稳定性和表面疏水性（H0）,测定Pickering乳液的粒径、显微结构和流变特性,考察m(WalPI)∶m(GOS)在10∶0～10∶5变化时,WalPI-GOS颗粒特性及Pickering乳液性质的变化。结果表明,m(WalPI)∶m(GOS)＝10∶4时,WalPI-GOS和Pickering乳液具有最佳的性能。WalPI-GOS的平均粒径为82.08 nm,Zeta电位为-52.37 mV,乳化活性（EAI）、乳化稳定性（ESI）为31.12 m2/g和4346.35 min,表现出良好的乳化性和稳定性;WalPI部分疏水基团被包埋于WalPI-GOS分子内部,降低了H0（840.81 a.u.）,提高了游离巯基含量（8.78 μmol/g）和熔融温度（93.74 ℃）;WalPI与GOS的复合改变了WalPI的二级和三级结构,形成以β-折叠为主的二级结构,WalPI与GOS通过氢键、静电相互作用和疏水相互作用形成紧密的网络结构;Pickering乳液粒径仅为5.24 ?m,液滴均匀分布,形成了弹性凝胶网络结构;当剪切速率为0.1 s-1时,具有最高的表观黏度1.06 Pa·s。WalPI与GOS间的高交联密度,增强了Pickering乳液的凝胶网络结构。     

PVAc乳胶/改性大豆分离蛋白共混胶黏剂的制备及性能

针对大豆蛋白胶黏剂耐水性差的缺点,用尿素初步改性大豆分离蛋白（SPI）,然后与白乳胶（PVAc）共混合成了共混改性大豆分离蛋白胶黏剂。采用正交实验方法考察了大豆蛋白胶与白乳胶质量比、共混时间、交联剂质量分数、交联时间对大豆蛋白胶黏剂剪切粘接强度的影响,确定了优化配比及制备工艺条件,并在此基础上采用正交试验优化了热压参数。结果表明：大豆蛋白胶与白乳胶质量比10∶1,共混时间1h,交联剂质量分数1.0%,交联时间1.5h,热压温度120℃,热压压强1.2MPa,热压时间2min/mm,涂胶量250g/m2时,测得胶黏剂的干态剪切粘接强度为2.01MPa,按照Ⅰ类胶合板标准测得湿态剪切粘接强度为1.04MPa,并对优化配方进行了结构与性能分析。     

Characterization of texture and mechanical properties of heat-induced soy protein gels

Heat-set gels were prepared from acid-precipitated soybean proteins at various heating temperatures (80–100°C), protein concentrations (18–20%), and proportions of glycinin. The gels were evaluated for mechanical parameters by means of a compression-decompression test. Gels formed at higher heating temperature and protein concentration were firm, tough and unfracturable. The elasticities of the gels were similar at all protein concentrations and were lower when heated at higher temperature. Heating above 93°C was necessary for formation of rigid gels. The glycinin/β-conglycinin ratio affected the texture of the gels. Three-dimensional representation of the gels through factor analysis of instrumental data and calculation of factor scores was useful to evaluate the texture of the gels.     

Preparation of soy protein concentrate and isolate from extruded-expelled soybean meals

Soy protein concentrates (SPC) and soy protein isolates (SPI) were produced from hexane-defatted soy white flakes and from two extruded-expelled (EE) soy protein meals with different degrees of protein denaturation. Processing characteristics, such as yield and protein content, and the key protein functional properties of the products were investigated. Both acid-and alcohol-washed SPC from the two EE meals had higher yields but lower protein contents than that from white flakes. Generally, SPC from an acid wash had much better functional properties than those from an alcohol wash. The SPI yield was highly proportional to the protein dispersibility index (PDI) of the starting material, so the EE meal with lower PDI had lower SPI recovery. The protein content in SPI prepared from EE meals was about 80%, which was lower than from white flakes. Nevertheless, SPI from EE meals showed functional properties similar to or better than those from white flakes. The low protein contents in SPC and SPI made from EE meals were mainly due to the presence of residual oil in the final products. SPI made from EE meals had higher concentration of glycinin relative to β-conglycinin than that from white flakes.     

环氧氯丙烷改性水性硝化纤维乳液的制备及性能

以硝化纤维(NC)、异佛尔酮二异氰酸酯(IPDI)和二羟甲基丙酸(DMPA)等为主要原料,制得自乳化型WNC(水性硝化纤维)乳液;然后以环氧氯丙烷(ECH)为交联改性剂,制成改性WNC乳液胶粘剂。研究结果表明:当w(DMPA)=3.5%、w(ECH)=7%时,改性WNC乳液具有优良的储存稳定性,其胶膜耐水性(吸水率为9.1%)、T型剥离强度(7.1 N/mm)、拉伸强度(14.9 MPa)和断裂伸长率(529.3%)俱佳,柔韧性和耐热性优异。     

Preparation and characterization of soy protein isolate films modified with sorghum wax

The effect of increasing the concentration of sorghum wax paste on the characteristics of soy protein isolate (SPI) films was investigated. Water vapor permeability (WVP), tensile strength (TS), elongation at break (E), and total soluble matter (TSM) of cast SPI films were determined. Sorghum wax paste extracted with ethanol was added to film-forming solutions of SPI at 5, 10, 15, or 20% w/w of protein. As the concentration of wax paste increased, mean WVP, E, and TSM values of SPI-sorghum-wax-paste composite films decreased and were lower than those of control SPI films. Mean TS values were lower than the control upon addition of 5 and 10% wax paste; however, TS values increased at 15 and 20% was concentrations. Although no differences in components of sorghum wax were observed between paste extracted with ethanol and wax extracted with hexane, paste extracted with ethanol was miscible with the filmforming solution. SPI-sorghum wax paste films had better water barrier and physical properties compared to control films.     

微波辐射下聚醚改性聚硅氧烷的合成及其乳液的性能

以含氢硅油与封端聚醚为原料,在微波辐射条件下合成出了聚醚改性聚硅氧烷,利用红外光谱对其结构进行了表征,采用均匀设计法对合成参数进行了优化,优化条件为：微波功率为650 W,封端聚醚与含氢硅油的摩尔比取1.1∶1,添加质量比为15 mg/kg的氯铂酸催化剂,于100 ℃反应30 min,在该条件下,平均转化率为96.8%。以合成的聚醚聚硅氧烷为主要活性单体制备出了消泡剂乳液,并考察了温度、pH值对制备的消泡剂性能的影响,结果表明制备的消泡剂在常温到98 ℃,酸性或碱性条件下的消泡及抑泡性能良好。     

马铃薯/乳清蛋白复合凝胶的性质和微观结构

为减少乳清蛋白用量，用马铃薯蛋白替代乳清蛋白质量的一半制备热诱导凝胶。通过色度、质构、水分分布、流变等考察了总蛋白浓度（40~80 g/L）对于复合凝胶物理性质的影响。结果表明，复合凝胶的最低成胶浓度为50 g/L，与乳清蛋白80 g/L的最低成胶浓度相比，乳清蛋白用量减少了2.2倍。总蛋白浓度从50 g/L提高到80 g/L时，复合凝胶偏黄，硬度和弹性分别增加了5.28倍和5.90%，但束缚水含量降低了3.63%。储能模量（G''）显示较弱的频率依赖性。CLSM和SEM观察表明，蛋白浓度80 g/L的复合凝胶孔隙尺寸小，具有由颗粒聚集体组成的均一致密网络结构，因而具有较高G''。红外光谱表征结果表明，复合凝胶中β-折叠和β-转角约占蛋白二级结构的70%。溶解度测试结果表明，维持复合凝胶结构的作用力中氢键和疏水相互作用的贡献高于二硫键。     

改性大豆分离蛋白对顺丁橡胶/丁苯橡胶复合材料性能的影响

将糊化改性的大豆分离蛋白( SPI)等量替代炭黑填充至顺丁橡胶/丁苯橡胶中,研究了改性SPI的粒径和热性能,考察了改性SPI用量对橡胶复合材料物理机械性能、热性能、压缩生热性能的影响,并与白炭黑和轻质碳酸钙填充复合材料进行了对比.结果表明,改性SPI的中位径由原来的115.25 μm减小至37.63 μm,比表面积由原...