共查询到16条相似文献,搜索用时 359 毫秒
1.
聚苯醚离聚体水基微乳液粒径及稳定性的研究 总被引:2,自引:0,他引:2
以乙酰磺酸为磺为磺化剂制备了磺化度为3~17mol%的磺化聚苯醚(SPPO),并中和成盐,在一定的温度和搅拌速度下,加水将SPPO离聚体溶液乳化成水包同的稳定水基微乳液。用光散射法及航向电镜法(TEM)测定了SPPO离聚体水基微乳液的粒径及粒径分布,研究了磺化度、溶剂的极性、因含量等因素对微乳液粒径及稳定性的影响。 相似文献
2.
离聚体水基微乳液化的研究——聚苯乙烯离聚体微乳化过程相反转的表征 总被引:7,自引:0,他引:7
以乙酰磺酸为磺化剂制备磺化度为3~15mol%的磺化聚苯乙烯(SPS)并中和成盐.在一定的温度和搅拌速率下,加水将SPS乳化成水包油的稳定水基微乳液.用乳化过程中体系电导率和粘度的变化表征了乳化相反转过程.研究了溶剂的极性和离子含量对聚苯乙烯离聚体溶液可乳化性和乳化过程及乳液稳定性的影响. 相似文献
3.
羧化聚苯醚离聚体/磺化聚苯乙烯离聚体共混体系中离子基团的增容作用 总被引:1,自引:0,他引:1
用DSC方法研究了羧化聚苯醚(CPPO)/磺化聚苯乙烯(SPS)、以及它们对应的碱金属离子(Li+、Na+、Cs+)中和的离聚物共混体系的相容性.结果表明,这一体系具有较宽的相容范围,金属离子的引入使共混体系的相容性有所变化,Li+和Cs+能促进相容性,而Na+则使相溶性略有减弱. 相似文献
4.
5.
6.
7.
8.
9.
纳米刚性微粒与橡胶弹性微粒同时增强增韧聚丙烯的研究 总被引:83,自引:0,他引:83
通过力学性能测试、动态力学试验、DSC 分析以及材料断面形貌与结构分析等手段,对以纳米二氧化硅(SiO2) 为刚性微粒、以三元乙丙橡胶(EPDM) 为弹性微粒组成的聚丙烯(PP)/ 纳米SiO2/EPDM 的同时增强增韧效果进行了研究.结果显示,上述两种微粒可同时大幅度提高PP 的韧性、强度和模量,当PP/ 纳米SiO2/EPDM 为80/3/20 时,两种微粒体现较明显的协同增韧效应.纳米SiO2 可提高PP 的结晶温度和结晶速度,并使球晶细化.纳米SiO2 刚性微粒在PP连续相中以微粒团聚体形态分布,构成团聚体的平均微粒数约为6 ~7 ,其与PP基体表现出较强的结合牢度.PP/ 纳米SiO2/EPDM 的综合性能已接近或达到工程塑料的性能. 相似文献
10.
讨论了聚2,6-二甲基-1,4-苯撑氧(PPO)与三甲基氯硅烷和三苯基氯硅烷的反应,合成了一系列取代含量不同的三甲基硅取代PPO(TMS-PPO)和三苯基硅取代PPO(TPS-PPO).研究了取代基团不同和取代含量变化对聚合物的气体选择透过性能的影响,发现TMS-PPO的气体透过系数随三甲基硅取代量加大而增高,分离系数下降;TPS-PPO的气体透过系数和分离系数都随三苯基硅取代量的增加而下降,TPS-PPO与TMS-PPO的气体溶解系数相近,扩散系数差别较大.故二者气体透过系数的不同主要是由于扩散系数的差异.从化学结构与气体透过性能关系的角度来看,若在聚合物分子中引入有较小转动自由能的大基团,则有利于气体分子的扩散透过. 相似文献
12.
13.
14.
Linear polyurethanes containing ionic centers at wide intervals are heteropolymers having a pronounced segment structure, i.e. ionomers. As a result of interactions between chains (Coulomb forces and hydrogen bonds), their properties are similar to those of crosslinked elastomers. They are strongly associated both in organic and in aqueous solutions. Polyurethane ionomers in polar organic solvents spontaneously form stable aqueous dispersions on addition of water, with the ionomer as the disperse phase. The particle size can be varied between 20 nm and 1 mm. 相似文献
15.
Yuan-ze Xu Yu-zhe Wu Jian-mao Yang 《高分子科学》2006,(2):155-161
The mechanism of phase inversion emulsification process (PIE) was studied for waterborne dispersion of highly viscous epoxy resin using non-ionic polymeric surfactants. Drop deformation and breakup, rheological properties, conductivity, and particle size measurements reveal the micro-structural transition amid emulsification. It is revealed that strong flow causes water drop to burst with the formation of droplets and huge interface. Phase inversion corresponds to an abrupt rheological transition from a type of viscous melt with weak elasticity to a highly elastic type of aqueous gel. This implies that the phase inversion equivalent to a curvature inversion. Based on this, a geometric model is postulated to correlate process variables to the particle size. The coverage and conformation of the surfactant plays key role for the particle size of the final emulsion. The interactions of thermodynamic and hydrodynamic effects are also discussed. It is concluded that the thermodynamics control the PIE while the hydrodynamics drives the creation of interface and involves every step of PIE. 相似文献
16.
Macierzanka A Szelag H Moschakis T Murray BS 《Langmuir : the ACS journal of surfaces and colloids》2006,22(6):2487-2497
The emulsification processes, during which acylglycerols/zinc stearate emulsifier, water, and oil phase formed ternary systems, such as water-in-oil (W/O) emulsions, oil-in-water (O/W) dispersions, and unstable oil-water mixtures, were investigated in order to characterize the progressive transformations of the dispersed systems. The type, structure, and phase transitions of the systems were found to be determined by temperature and water phase content. Crystallization of the emulsifier caused the destabilization and subsequent phase inversion of the emulsions studied, at a temperature of 60-61 degrees C. The observed destabilization was temporary and led, at lower temperature, to W/O emulsions, "O/W + O" systems, or O/W dispersions, depending on the water content. Simultaneous emulsification and cooling of 20-50 wt % water systems resulted in the formation of stable W/O emulsions that contained a number of large water droplets with dispersed oil globules inside them ("W/O + O/W/O"). In water-rich systems (60-80 wt % of water), crystallization of the emulsifier was found to influence the formation of crystalline vesicle structures that coexisted, in the external water phase, with globules of crystallized oil phase. Results of calorimetric, rheological, and light scattering experiments, for the O/W dispersions obtained, indicate the possible transition of a monostearoylglycerol-based alpha-crystalline gel phase to a coagel state, in these multicomponent systems. 相似文献