大孔交联甲基丙烯酸缩水甘油酯共聚物的合成及其结构性能研究(Ⅰ)

甲基丙烯酸缩水甘油酯（GMA）为单体，三烯丙基氰尿酸酯（TAC）为交联剂，在致孔剂甲苯、正庚烷存在下，用悬浮聚合法制得一系列大孔共聚物（GT）。测定了共聚物的孔结构性能，讨论了不同交联剂及致孔剂用量和配比对共聚物结构的影响，并初步讨论了特大孔共聚物的形成机理。     

二乙烯苯交联大孔聚甲基丙烯酸缩水甘油酯的合成及其结构性能的研究

选用反应性单体甲基丙烯酸缩水甘油酯（ＧＭＡ），以二乙烯苯（ＤＶＢ）作为交联剂。在致孔剂甲苯和正庚烷存在下，用悬浮聚合的方法制得了一系列大孔ＧＤ共聚物。通过测定树脂的孔结构性能及化学组成，讨论了不同交联剂用量和配比对共聚物结构的影响。     

二乙烯苯交联大孔聚甲基丙烯酸缩水甘油酯的合成及其结构性能的研究

选用反应性单体甲基丙烯酸缩水甘油酯（ＧＭＡ），以二乙烯苯（ＤＶＢ）作为交联剂。在致孔剂甲苯和正庚烷存在下，用悬浮聚合的方法制得了一系列大孔ＧＤ共聚物。通过测定树脂的孔结构性能及化学组成，讨论了不同交联剂用量和配比对共聚物结构的影响。     

二乙烯苯交联大孔聚甲基丙烯酸羟乙酯的合成及其结构性能的研究

选用反应性单体甲基丙烯酸羟乙酯（ＨＥＭＡ），以二乙烯苯（ＤＶＢ）作为交联剂。在致孔剂甲苯和环己烷存在下，用经典悬浮聚合的方法制得了一系列的大孔共聚物。通过测定树脂的孔结构性能及化学组成，讨论了不同交联剂用量和配比对共聚物结构的影响。     

二乙烯苯交联大孔聚甲基丙烯酸羟乙酯的合成及其结构性能的 …

选用反应性单体甲基丙烯酸羟乙酯（ＨＥＭＡ）,以二乙烯苯（ＤＶＢ）作为交联剂。在致孔剂甲苯和环己烷存在下,用经典悬浮聚合的方法制得了一系列的大孔共聚物。通过测定树脂的孔结构性能及化学组成,讨论了不同交联剂用量和配比对共聚物结构的影响。     

二乙烯苯交联大孔聚甲基丙烯酸缩水甘油酯的合成及其结构性 …

选用反应性单体甲基丙烯酸缩水甘油脂（ＧＭＡ）,以二乙烯苯（ＤＶＢ）作为交联剂。在致孔剂甲苯和正庚烷存在下,用悬浮聚合的方法制得了一系列大孔ＧＤ共聚物。通过测定树脂的孔结构性能及化学组成,讨论了不同交联剂用量和配比对共聚物结构的影响。     

大孔交联甲基丙烯酸缩水甘油酯共聚物的合成及其结构性能研究 …

甲基丙烯酸缩水甘油酯为单体，三烯丙基氰尿酸酯为交联剂，在致孔剂甲苯，正庚烷存在下，用悬浮聚合法制得一系列大孔共聚物。测定了聚物的孔结构性能，讨论了不同交联剂及致孔剂用量和配比对共聚物结构的影响，并初步讨论了特大孔共聚物的形成机理。     

大孔高交联苯乙烯—双烯—A共聚物的合成及孔结构的研究

利用新型闻联剂－双甲基丙烯酰氧苯基丙烷（双烯－Ａ）与苯乙烯悬浮共聚合，以甲苯、异戊醇作致孔剂，合成了一系列大孔高交联共聚物，考察了双烯－Ａ用量、甲苯／异戊醇配比、 引发剂用量及分散剂用量对共聚物孔结构的影响。通过红外光谱、表观密度、全自动物理吸附仪及扫描电镜对干燥的共聚物小球进行了表征。结果表明，随交联剂双烯－Ａ含量的增加，苯乙烯－双烯－Ａ共聚物的表面孔结构明显增大，共聚物的比表面积、孔容及孔径均     

大孔标准苯乙烯—二乙烯苯共聚物的合成及其结构的研究

本文利用前文分离提纯的对位及间位二乙烯苯作为交联剂,合成了大孔标准苯乙烯—二乙烯苯共聚物,系统地研究了共聚物的交联度,致孔剂的种类和用量以及良溶剂—非良溶剂致孔剂配比的变化对共聚物孔结构的影响。实验结果表明:不同结构的二乙烯苯作交联剂所合成的共聚物,他们的孔结构参数都随共聚物的合成条件的变化呈现规律性的变化,但它们彼此间在结构性能上存在着明显的差异。     

醋酸乙烯酯－二乙烯苯大孔共聚物的合成及其结构性能的研究

制备了以醋酸乙烯酯（ＶＡｃ）为单体，以二乙烯苯（ＤＶＢ）为交联剂的共聚物小球．分别测定了它们的交联度，致孔剂的性质和用量，共聚时间等诸因素对共聚物的比表面积，孔容，平均孔径，表观密度和骨架密度的影响．     

Effect of Diluent Mixture on Porous Structure of Polyphenylene Sulfide via Thermally Induced Phase Separation

Polyphenylene sulfide (PPS) microporous membranes were prepared via the thermally induced phase separation process using diluent mixtures of diphenyl ether (DPE) and diphenyl ketone (DPK). The effects of DPE ratio to DPK in the diluent mixture on the microstructure were investigated. The results showed that the pore morphology of the membranes prepared from the diluent mixture was different from those of fabricated from pure diluents. Moreover, the pore structures of the membranes were changed along with the variation of the diluent composition.     

A novel method for the pore size control of the battery separator using the phase instability of the ternary mixtures

The battery separator plays a key role in determining the capacity of the battery. Since separator performance mainly depends on the pore size of membrane, development of a technique for the fabrication of the membrane having controlled pore size is essential in producing a highly functional battery separator. In this study, microporous membranes having the desired pore size were produced via thermally‐induced phase separation (TIPS) process. Control of the phase boundaries of polymer‐diluent blends is the main concern in manipulating pore size in TIPS process, because pore size mainly depends on the temperature gap between phase separation temperature of the blend and the crystallization temperature of polymer. Microporous membranes having controlled pore size were produced from polyethylene (PE)/dioctyl phthalate (DOP) blends, PE/isoparaffin blends, and polymer/diluent‐mixture ternary blends, that is, PE/(DOP/isoparaffin) blends. PE/DOP binary blends and PE/(DOP/isoparaffin) ternary blends exhibited typical upper critical solution temperature (UCST) type phase behavior, while PE formed a homogeneous mixture with isoparaffin above the crystallization temperature of PE. When the mixing ratio of polymer and diluent‐mixture was fixed, the phase separation temperature of PE/diluent‐mixture blend first increased with increasing DOP content in the diluent‐mixture, went through a maximum centered at about 80 wt % DOP and then decreased. Furthermore, the phase separation temperatures of the PE/diluent‐mixture blends were always higher than that of the PE/DOP blend when diluent‐mixture contained more than or equal to 20 wt % of DOP. Average pore size of microporous membrane prepared from PE/DOP blend and that prepared from PE/isoparaffin blend were 0.17 and 0.07 μm, respectively. However, average pore size of microporous membrane prepared from ternary blends was varied from 0.07 to 0.5 μm by controlling diluent mixing ratio. To understand the phase behavior of ternary blend, phase instability of the ternary mixture was also explored. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 2025–2034, 2006     

Effect of the porosity of PS–DVB-copolymers on ion chromatographic behavior in inverse size-exclusion and ion chromatography

Small and highly pressure-stable PS-DVB copolymers of different porosity had been prepared by a two-step swelling procedure which enabled variation of diluent composition, an important characteristic affecting the porosity. The polymers were characterized by inverse size-exclusion chromatography and scanning electron microscopy. Subsequent chloromethylation and amination resulted in anion exchangers suitable for ion chromatography.The pore volume and the pore-size distribution is substantially affected by the fraction of the solvens component in the diluent. It was apparent from scanning electron microscopy that surface structure and the size of the polymer particles was not affected by diluent composition. The functionalization process led to a decrease in pore volume. The pore-size distribution remained unchanged during functionalization, which can be explained in terms of partial closing of all pore sizes. The chromatographic efficiency of the functionalized polymers in ion chromatography was highly dependent on diluent composition and the extent of functionalization was determined by the total pore volume.The composition of the diluent is an excellent tool for optimization of polymers used for the synthesis of surface-functionalized anion exchangers.     

TIPS法制备聚偏氟乙烯平板微孔膜及其表征

以邻苯二甲酸二甲酯(DMP)为稀释剂,采用热致相分离法(TIPS)制备了聚偏氟乙烯(PVDF)平板微孔膜。利用差示扫描量热仪分析了不同PVDF/DMP体系的结晶性能;通过测试纯水通量、孔隙率、泡点、平均孔径、拉伸强度等对膜进行了表征。结果表明:DMP含量增大,结晶温度向低温方向移动,膜拉伸强度降低,当DMP的质量分数为0.70时膜拉伸强度有明显拐点;PVDF/DMP体系冷却发生固-液相分离;PVDF含量增大,膜水通量、孔隙率、最大孔径和平均孔径均减小。     

Porous structure formation and swelling properties of styrene–divinylbenzene copolymers – effect of diluent nature

The effect of the diluent solvating power on the porosity and swelling properties of styrene–divinylbenzene copolymers was investigated. A mechanism for the swelling of macroporous copolymers in good and poor solvent was proposed. The porous structures were classified according to kinetic data of a poor solvent sorption. When the diluent–copolymer affinity was reduced, the fixed pore volume increased, but the nuclei swelling and the elasticity of internuclear chains diminished.     

Influence of diluent composition on the porous structure of methacrylate copolymers

The porous structure of copolymers obtained by suspension polymerization has been investigated. Three different copolymers were synthesized—styrene‐divinylbenzene, ethylene glycol dimethacrylate‐divinylbenzene, and 1,4‐phenylene dimethacrylate‐divinylbenzene. All the copolymers were porous. As a pore‐forming diluent, the mixture of toluene (good solvent) and n‐dodecane (nonsolvent) was used. The influence of the composition of two‐component diluent on the porous structure of the copolymers has been examined. Surface areas, pore volumes, pore size distributions, skeletal and apparent densities, and swellability coefficients were determined for the copolymers obtained in the presence of 0, 15, 50, 85, and 100% (v/v) toluene in the mixture with n‐dodecane. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 3079–3085, 2002     

Monodisperse porous polymer particles: Formation of the porous structure

Monodisperse porous styrene-divinylbenzene copolymer particles were prepared via seeded emulsion polymerization using a mixture of linear polymer (polystyrene seed) and non-solvent as inert diluent. Experimental evidence was presented to describe the mechanism of formation of porous polymer particles during the copolymerization and solvent extraction stages, in which porosity was a consequence of phase separation in the presence of diluents. Pore structure formation was investigated by changes in copolymerization kinetics, gel content, crosslinking density, particle morphology, surface area, pore volume, and pore size distribution. The process of copolymerization was presented, based on the concepts of production, agglomeration, and fixation of the interior gel microspheres of polymer particles. A portion of linear polymer used as diluent was found to participate in the network structure while the porous matrix was built-up. The influence of the removal of the linear polymer from the matrix pores during the solvent extraction process on the porous structure was also discussed.     

聚全氟乙丙烯中空纤维膜研究

以聚全氟乙丙烯(FEP)为成膜聚合物,复合无机粒子为成孔剂,邻苯二甲酸二辛酯(DOP)为稀释剂,采用熔融纺丝工艺制备得到FEP中空纤维膜.分析和讨论了不同成膜体系对FEP中空纤维膜热性能、动态力学性能和力学性能的影响,并对膜的纯水通量和孔径分布进行表征.用扫描电子显微镜(SEM)观察了膜的横断面和表面形貌.结果表明,所得FEP中空纤维膜为由溶出微孔和界面微孔组成的海绵状孔结构.随着成孔剂含量的增加,成孔剂在成膜体系中分散程度变差,容易发生团聚,最终导致膜孔径变大,孔径分布变宽.成孔剂和稀释剂对FEP中空纤维膜的热性能和动态力学性能影响较小.当FEP含量增加到70 wt％时,膜表面容易形成一层致密层,降低了膜的通透性.     

Synthesis and characterization of monodisperse porous polymer particles

Monodisperse porous polymer particles in the size range of 10 μm in diameter were prepared via seeded emulsion polymerization. Linear polymer (polystyrene seed) or a mixture of linear polymer and solvent or nonsolvent were used as inert diluents. The pore diameters of these porous polymer particles were on the order of 1000 Å with pore volumes up to 0.9 mL/g and specific surface areas up to 200 m²/g. The physical features of the porous polymer particles depended on the diluent type and the crosslinker content, as well as the molecular weight of polymer seed particles. By varying the molecular weight of the linear polymer, monodisperse porous polymer particles with different pore size distribution could be synthesized. Polymer seed with a low degree of crosslinking instead of linear polymer could also be used to prepare monodisperse porous polymer particles with smaller pore volume and pore size.