ＥＶＡ—ＰＵ乳液共混体系研究

研究不同比例乙烯－醋酸乙烯共聚物（ＥＶＡ）乳液与聚氨酯（ＰＵ）乳液共混体系稳定性,流变性及表面精度与pH值关系,以示差势量扫描量热计（ＤＳＣ）表征共混体系相容性,共混体系对Ａ１,聚丙烯,纸等基材粘接强度都较ＥＶＡ乳液有明显增强,交联温度对共混乳液粘接强度影亦被研究,ＥＶＡ乳液与ＰＵ乳液配比为８０／２０时共混体系综合性能最好。     

PVAc/SiO2纳米复合乳液的性能研究

采用原位乳液聚合法制备了PVAc／纳米SiO2复合乳液,研究了纳米粒子对PVAc粘接强度和耐水性能的影响,并基于纳米压痕试验,分析了PVAc／纳米SiO2复合乳液的力学性能。研究表明,适量的纳米SiO2能显著改善PVAc胶层的粘接强度和耐水性能,并能明显提高PVAc薄膜的弹性模量、硬度及抗蠕变能力。     

EVA/PU乳液共混体系研究

研究不同比例乙烯 -醋酸乙烯共聚物 (EVA)乳液与聚氨酯 (PU)乳液共混体系稳定性、流变性及表观粘度与 p H值关系 ,以示差热量扫描量热计 (DSC)表征共混体系相容性。共混体系对 A1、聚丙烯、纸等基材粘接强度都较 EVA乳液有明显增强。交联温度对共混乳液粘接强度影响亦被研究。 EVA乳液与 PU乳液配比为 80 /2 0时共混体系综合性能最好     

改性聚醋酸乙烯酯乳液的研究进展

PVAc乳液成本低廉、无环境污染、粘接强度高,是一种环保型胶黏剂,广泛用于多孔性材料特别是木材间的胶合.但其本身存在着耐水性能差等缺点,即在湿热条件下其粘接强度会有很大程度下降.综述了近年来国内外对聚醋酸乙烯酯乳液在共混、共聚、保护胶体、乳化体系和引发体系五种改性的研究进展,并首次从联合改性(即结合两种或两种以上改性方法)的角度阐述了聚醋酸乙烯酯乳液的研究进展及今后的发展方向.通过改性,PVAc乳液的性能特别是耐水性能大大提高,扩大了其应用范围.     

环保增塑剂TXIB对PVAc乳液流变性能的影响

为考察环保增塑剂TXIB(2,2,4-三甲基-1,3-戊二醇二异丁酸酯)对PVAc(聚醋酸乙烯酯)乳液流变性能的影响,分析了TXIB掺量对PVAc乳液流变性能[如黏度、储能模量(G′)、损耗模量(G″)及损耗因子(tanδ)等]的影响。研究结果表明:在剪切应力作用下,PVAc乳液、TXIB/PVAc共混乳液均呈切力变稀现象;TXIB对PVAc乳液有明显的增稠作用,并且共混乳液的黏度随温度升高而增大,共混乳液的凝胶温度随TXIB掺量增加而降低;当应变较小时,TXIB的引入对PVAc乳液的稳定性影响较小;当温度或TXIB掺量较低时,共混乳液的相容性相对较好。     

ATO的表面修饰及其在抗静电胶中的应用

采用不同分子质量聚乙二醇（PEG）对锑掺杂纳米二氧化锡（ATO）进行了表面改性并比较了改性效果,用共混法制备了醋酸乙烯酯／锑掺杂纳米二氧化锡（PVAc／ATO）复合乳液,研究了复合乳液的物理力学性能及导电性能：结果表明,经过相对分子质量为20000的PEG表面修饰的ATO在乳液中分散良好,在含量较低情况下即可得到导电性良好的胶膜,且能增强乳液的粘接性能。     

脲醛脂树改性

本文用对甲苯磺酰胺改性脲醛树脂制得改性脲醛树脂,用PVAc乳液作改性脲醛树脂防老剂制得混合粘合剂,用上述两种粘合剂粘接付、木材质都取得良好效果;文章着重介绍了实验方法,改性剂对脲醛树脂稳定性,粘接强度的影响以及PVAc乳液对改性脲醛胶粘剂粘接强度的影响。     

丁腈橡胶／氯化丁基橡胶共混物的性能研究

研究了丁腈橡胶／氯化丁基橡胶共混物的低温性能和耐热性能。结果表明．选用TMTD／CZ／ZnO作共硫化体系,共混物体系两相的相容性较好;在并用比例为70／30时,与纯NBR相比,共混物Tg下降5.5℃,失重5％热分解温度提高38.4℃,且耐油性变化很小,适宜制备高低温性能较好的耐油橡胶制品。     

PU乳液对VAE乳液共混改性的研究

用系列聚氨酯（PU）乳液对VAE乳液进行共混改性，了共混乳液的稳定性，乳液膜性能，相容性等，结果表明，共混乳液的稳定性依赖于乳液的PH值，共混乳液胶膜的性能依赖于共混乳液的组成和PU链段中软段和硬段的比例，共混体系具有部分相容性，两者之间的相互作用主要发生在PU的硬段部分。     

相容剂对PE-HD／PET共混合金性能的影响

以乙烯-丙烯酸丁酯-甲基丙烯酸缩水甘油酯三元共聚物（PTW）作为高密度聚乙烯（PE-HD）／聚对苯二甲酸乙二醇酯（PET）共混合金的反应性相容剂，采用熔融挤出法制备了以PE-HD为基体的PE～Hi）／PET、共混合金。通过力学性能和流变性能测试，扫描电镜（SEM）和动态力学分析（DMA）等手段，研究丁PTW对共混合金性能的影响。结果表明：PTW提高了体系的综合性能，当PE-HD／PET配比为90／10，PTW含量在5份时，其缺口冲击强度提高了近400％，拉伸强度和断裂伸长率分别提高了25％和50％，同时改善了共混合金的加工性能。SEM分析表明PTW的加入增大了共混合金的界面相互作用，促进了分散相粒子的细化，从而提高丁体系相容性，DMA测试表明，PTW的加入使PET的玻璃化转变温度向PE—HD的玻璃化转变温度靠近：     

双组分高固含量复合薄膜用水性聚氨酯胶黏剂的制备

采用聚酯二元醇、甲苯二异氰酸酯（TDI）、二羟甲基丙酸（DMPA）等为原料制备了水性聚氨酯,讨论了水性聚氨酯乳液的固含量及亲水性脂肪族聚异氰酸酯交联剂对水性聚氨酯性能的影响。结果表明：随着水性聚氨酯乳液固含量的提高,乳液的黏度明显提高,复合薄膜T型剥离强度增大;随着交联剂用量的增加,水性聚氨酯胶膜的吸水性明显下降;当水性聚氨酯／交联剂配比为10／1．0,熟化时间为16h时,T型剥离强度值达到最大值。     

密度和黏结性可控的PE/POE/CaCO3体系颗粒流道调整剂的制备

采用聚乙烯（PE）、聚烯烃弹性体（POE）和碳酸钙（CaCO₃）共混制备了聚合物类颗粒流道调整剂，考察了不同CaCO₃含量和PE与POE比例条件下的PE/CaCO₃、POE/CaCO₃、PE/POE/CaCO₃三类颗粒流道调整剂的密度、熔点熔程、黏结性能、力学性能差异。结果表明，颗粒流道调整剂的密度随CaCO₃含量增加而增大，实现了1.05~1.20 g/cm³范围内可调；结合PE的熔融特性和POE的黏结性能，实现了黏结性能由PE/CaCO₃共混物熔融黏结转为POE/CaCO₃、PE/POE/CaCO₃体系软化黏结的可控调节；通过调节CaCO₃含量、PE与POE比例可以改变流道调整剂颗粒的熔点熔程和拉伸强度，相同CaCO₃含量时PE/POE/CaCO₃体系颗粒的拉伸强度随PE含量升高而增大。     

ACM/PA6耐油热塑性弹性体的制备及性能

研究了不同硫化体系、硫化剂含量及橡塑比对动态硫化丙烯酸酯橡胶/尼龙6(ACM/PA6)热塑性弹性体加工性能、力学性能和耐油性的影响。结果表明:3号硫化剂(N,N-二次肉桂基-1,6-己二胺)作为硫化剂最合适,其用量为2 phr或橡塑比为70/30时,热塑性弹性体性能最好。     

脲醛树脂/淀粉复合体系的常温固化及其力学性能

在脲醛树脂(UF)/淀粉(St)复合体系中引入聚醋酸乙烯酯(PVAc)、聚丙烯酰胺(PAM),氨基硅烷偶联剂(A212),通过力学性能测试和扫描电镜分析研究了复合体系的常温固化过程、材料微观结构及其性能变化的关系。结果表明,当m(UF)/m(St)/m(PVAc)/m(固化剂CA)/m(PAM)/m(A212)=200/50/2/3/5/0.06时,体系冲击强度为190kJ/m2,弯曲强度为24MPa。PVAc的引入延长了体系的固化时间,PAM较好地改善了体系的分散状态。A212明显改善了体系分散的均匀性和相界面结合状态,材料微观结构更为致密,力学性能提高,尤其是韧性明显改善。     

Miscibility Studies of Poly (vinyl acetate) and Cellulose Acetate

Polymer blends of poly (vinyl acetate) (PVAc) with cellulose acetate (CA) have been prepared by solution blending, and their miscibility has been investigated by using physical techniques. Viscosity, density, and ultrasonic velocity for blend solutions at different percentages of the blend composition have been measured at 30°C. The results are discussed.     

腰果酚缩醛胺与环氧树脂固化反应的研究

研究了腰果酚缩醛胺(PCD)固化剂加成固化环氧树脂(EP)聚合物的合成,考察了不同因素对该聚合物性能的影响。结果表明:当m(PCD):m(EP)=30:70时,PCD/EP聚合物的综合性能最佳;此时,PCD/EP聚合物对基材表面的附着力为1级,其柔韧性为1mm,拉伸强度为43.52MPa,压缩强度为85.09MPa,断裂伸长率为8.9%,热变形温度为125℃,硬度为2H(铅笔法),并具有优异的耐化学介质性能。     

Polypropylene composites. II: Structure-property relationships in two- and three-component polypropylene composites

Two- and three-component polypropylene (PP) blends and composites were prepared to study their structure/property relationships. Butadiene-styrene (BDS) copolymers of low compatibility formed large particles of poor adhesion in PP resulting in inferior mechanical properties. Better miscibility of ethylene-propylene-diene (EPDM) elastomer results in more finely dispersed particles and the experimental results indicate a transition to an interpenetrating network (IPN)– like structure with increasing elastomer content. Effective impact modification can be achieved only with EPDM elastomers of sufficient miscibility. Mutual wettability and adhesion of the components determine the structure and properties in PP/elastomer/filler systems. Modification of PP by acrylic acid grafting promotes PP/filler adhesion which, in turn, results in the separate dispersion of the components. In an unmodified PP matrix, a significant amount of the filler is encapsulated by the elastomer. At low filler content, better low temperature impact strength is achieved in the case of separately dispersed components, while encapsulation is more advantageous at high filling grades.     

Phase behavior and properties of poly(methyl methacrylate)/poly(vinyl acetate) blends prepared via in situ polymerization

Polymer blends composed of poly(methyl methacrylate) (PMMA) and poly(vinyl acetate) (PVAc) were prepared via radical-initiated polymerization of methyl methacrylate (MMA) in the presence of PVAc. Differential scanning calorimetry and dynamic mechanical analysis were employed to investigate the miscibility and phase behavior of the blends. The PMMA/PVAc blends of in situ polymerization were found to be phase separated and exhibited a two-phase structure, although some chain transferring reaction between the components occurred. The phase separation resulted from the solvent effect of MMA during the in situ polymerization, which was confirmed by the investigation of phase behavior based on solution cast blending. Solubility analysis of the polymerized blends indicated that some chain transferring reaction between the components occurred during the polymerization. An abrupt increase in gel content from 21.2 to 72.4 wt % was observed when the inclusion of PVAc increased from 30 to 40 wt %, and the gel component consisted of the component polymers as shown by infrared spectroscopy studies. The thermogravimetric analysis study indicated that the inclusion of a small amount of PVAc gives rise to a marked stabilization effect on the thermal stability. The PMMA/PVAc blends exhibited increased notched impact properties with the inclusion of 5 wt % PVAc. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 675–684, 1998     

不同粒径含氟丙烯酸酯共聚乳液的合成及膜表面疏水性能研究

采用半连续种子乳液聚合的方式,以丙烯酸丁酯、甲基丙烯酸甲酯和甲基丙烯酸六氟丁酯为原料制备了粒径分别为30nm、75nm、210nm左右的含氟丙烯酸酯共聚物乳液。通过乳胶粒核壳结构设计与大小粒径乳液机械共混改性2种方法研究了如何在较少含氟单体用量的情况下达到较好的表面疏水性能。利用X射线光电子能谱、动态光散射仪、接触角测定仪等分析手段,研究了共聚物膜的表面性能和共聚物乳液粒径的大小及分布,测试结果表明,核壳结构乳液成膜后壳层含氟量较高,膜表面接触角大于90,°疏水性能强;而大小粒径乳液共混物成膜后表面含氟量较低,却仍能得到90°以上的接触角,表明乳胶膜表面具有粗糙结构,具有一定的仿荷叶效应。