聚氨酯／聚丙烯酸酯类胶乳互穿聚合物网络的研制

采用两步法合成了聚氨酯（ＰＵ）聚丙烯酸酯（ＰＡＡ）胶乳互穿聚合物网络（ＬＩＰＮ）。试验结果表明ＰＵ／ＰＡＡ ＬＩＰＮ具有核壳结构。     

聚氨酯／聚丙烯酸酯类胶乳互穿聚合物网络的研制

采用两步法合成了聚氨酯聚丙烯酸酯（ＰＡＡ）胶乳互穿聚合物网络（ＬＩＰＮ）。试验结果表明ＰＵ／ＰＡＡ ＬＩＰＮ具有核壳结构。     

胶乳型互穿聚合物网络

本文概述了胶乳型互穿聚合物网络(LIPN)的概念及制法,形态结构的基本特点,研究方法及影响因素;玻璃化转变行为、物理及力学性能;并对其应用进行了简要介绍。     

聚甲基乙烯基硅氧烷／聚丙烯酸丁酯顺序互穿聚合物的性能研究

采用将聚甲基乙烯基硅氧烷（孙爪幅）在丙烯酸丁酯单体（BA）与引发剂过氧化苯甲酰组成的溶液中溶胀一定时间后，BA在PMVS中原位聚合的方法，制备出PMVS／聚丙烯酸丁酯（PBA）顺序互穿聚合物（PMVS／PBASIPNs），利用红外光谱、动态力学分析和热失重分析研究了材料表面与内部的分子结构、动态力学性能和热分解性能。结果表明，PBA的浓度在复合体系厚度方向上呈梯度分布，其浓度从表面向内部依次增加。与PMVS相比，PMVS／PBASIPNs阻尼性能较好，其损耗因子tanδ最大值为0．63，tanδ大于0．3的温度范围为-41～-9℃。根据不同升温速率下的热重分析曲线，用Doyle方法得到在分解率α=0．1～0．5时，热分解反应级数为一级反应，反应活化能E为143．4kJ·mol^-1。     

有机硅改性丙烯酸酯胶乳型互穿聚合物网络——乳化剂对乳胶粒形态和尺寸的影响

采用两步法制得了胶乳型互穿聚合物网络聚二甲基硅氧烷／聚丙烯酸丁酯（LIPN PDMS／PBA），首先，以八甲基环四硅氧烷，γ－甲基丙烯酰氧丙基三甲氧基硅烷，乙烯基三乙氧基硅烷为原料，制成交联聚二甲基硅氧烷（PDMS）；第二步，溶胀在PDMS中的丙烯酸丁酯（BA）聚合，即得LIPN PDMS／PBA，考察了第二步反应中乳化剂对乳胶粒形态和尺寸及乳液聚合稳定性的影响。结果表明，在BA聚合过程中，适时补加适量乳化剂可极大地改善乳液聚合的稳定性及乳胶粒的形态和尺寸。     

聚丙烯酸丁酯／聚环氧树脂互穿聚合物网络的研究

本文研究了丙烯酸丁酯/聚环氧树脂混合体系的基本反应、相分离以及聚丙烯酸丁酯的增韧效果。试验结果表明:在混合体系中,丙烯酸丁酯的聚合反应与环氧树脂的固化反应彼此间干扰很小,二者各自形成了聚合物网络;混合体系的相分离过程有两种方式,取决于丙烯酸丁酯与环氧树脂聚合反应的相对速率;用互穿聚合物网络技术在环氧树脂中混入聚丙烯酸丁酯即可提高其冲击韧性,进一步通过组分优化,可望得到综合性能优越的环氧树脂改性材料。     

聚丙烯酸酯胶乳互穿聚合物网络/蒙脱土纳米复合材料的制备与性能

通过就地乳液聚合方法合成了聚丙烯酸酯胶乳互穿聚合物网络／蒙脱土纳米复合材料。与纯聚丙烯酸酯胶乳互穿聚合物网络相比,该材料的阻尼性能有较大幅度的提高,蒙脱土的加入提高了互穿聚合物网络中软、硬相的相容性或互穿程度,因此起到了既增强又增韧的效果。     

聚氨酯／聚苯乙烯互穿聚合物网络的结构与性能研究

通过改变组分比研究了PU/PS IPN结构与性能变化的规律。结果表明,在PU/PS为70/30时,电镜照片上呈现精细的细胞结构,相区尽寸缩小,网络间互穿程度最高,且溶胀度最低。热力学性能也同时出现最佳值,     

丙烯酸丁酯/VAE互穿聚合物乳液的研究

以互穿聚合物网络(IPN)方法合成丙烯酸丁酯与VAE共聚物乳液。研究了乳化剂、交联剂、溶胀时间、反应时间等条件对转化率的影响。以红外光谱、透射电子显微镜表征互穿共聚物乳胶膜的微观结构。通过吸水性及乳胶膜对水接触角的测定，证明其耐水性较VAE乳胶膜明显增强。。YEM照片表明互穿聚合物胶粒形态结构较VAE乳胶粒发生了明显变化。     

Effect of crosslinker,buffer, and blending on damping properties of poly(styrene‐acrylonitrile)/poly(ethyl acrylate‐ n‐butyl acrylate) latex interpenetrating polymer networks

A series of poly(styrene‐acrylonitrile)/poly(ethyl acrylate‐n‐butyl acrylate) latex interpenetrating polymer networks (LIPNs) are synthesized by changing the kind of crosslinker and introducing a buffer. The results show that the crosslinker has an important effect on the damping properties of the LIPNs; divinylbenzene is the best crosslinker in the study. Moreover, introducing a buffer into LIPNs leads to an increase of the damping values over the temperature range where the damping value surpasses 0.5. The LIPN blend prepared by mixing LIPNs results in broadening of the damping peak, therefore improving the damping properties. Tests of the damping properties show that the LIPNs have good practical value. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 2347–2351, 2002     

PMMA/P(BA-co-AA)界面交联LIPN阻尼材料的研究

用种子乳液聚合法合成了PMMA／P（BA－co-AA)界面交联乳胶互穿聚合物网络材料。动态力学谱结果表明，界面交联能提高乳胶互穿聚合物网络的高温阻尼性能；拉伸实验结果表明，界面交联提高了乳胶互穿聚合物网络的抗拉强度和断裂伸长率。     

Uralkyd and poly (butyl methacrylate) interpenetrating polymer networks

ABSTRACT:: Hydroxyl terminated alkyds synthesized from castor oil, glycerol, and different dibasic acids were used to develop uralkyds and their interpenetrating polymer networks (IPNs) with polybutyl methacrylate (PBMA). Glass transition temperature measurements gave the evidence of interpenetration. The IPNs were characterized for their physicomechanical properties and their phase morphology was studied by scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). As the concentration of the uralkyd in IPNs increases, a gradual increase in elongation, density, and swelling with a consequent decrease in the hardness were observed for all IPNs. Swelling is relatively more prominent in methyl ethyl ketone (MEK) and toluene than in water. From SEM it was observed that IPNs of PBMA‐uralkyd containing phthalic anhydride (UA‐P) as an acid part showed greater compatibility than those containing dimethyl terephthalate (UA‐D). From thermogravimetric analysis (TGA) no significant change was observed in the degradation behavior of the IPNs. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 825–832, 2000     

New interpenetrating polymer networks based on uralkyd–poly(butyl methacrylate)

A study on two‐component semi‐ and full‐interpenetrating polymer networks (IPNs) of soyabean‐oil based uralkyd resin (UA) and poly(butyl methacrylate) (PBMA) synthesized by a sequential technique, has been conducted. The IPNs obtained are characterized with respect to their mechanical properties, such as tensile strength, percentage elongation and hardness (Shore A). Phase morphology has been studied by scanning electron microscopy. Glass transition studies have been carried out using differential scanning calorimetry. The thermal characterization of the IPNs was undertaken with the aid of thermogravimetric analysis. The apparent densities of these samples have been determined and are compared. The effect of the compositional variation on the above‐mentioned properties was examined. The tensile strength exhibits a sudden rise (approximately three‐fold) for the semi‐ and full‐IPNs with composition UA: PBMA 40% : 60% compared with the UA:PBMA composition of 20% : 40%. © 2001 Society of Chemical Industry     

Modification of the mechanical and thermal properties of PVC by semi IPN formation with poly(butyl acrylate)

Semi1 and semi2 interpenetrating polymer networks of poly(vinyl chloride) PVC and in situ formed poly(butyl acrylate) (PBA) have been synthesized and characterized using diallyl phthalate (DAP) and ethylene glycol dimethacrylate (EGDM) as the crosslinkers of PVC and PBA, respectively. These two types of IPNs have been compared with respect to their mechanical and thermal properties. The semi1 IPNs displayed a decrease in their mechanical parameters and the physical properties as well, while in contrast, the semi2 IPNs exhibited a marginal increase in the corresponding values when compared to the crosslinked PVC in the case of semi1 IPN and linear PVC in case of semi2 IPN. The representative samples of semi1 and semi2 IPNs revealed a two‐stage‐degradation typical of PVC while confirming the increased stability of the samples with higher onset temperature of degradation. The softening characteristics as detected by thermomechanical analysis are in conformity with their mechanicals. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Fabrication and apparent kinetic study of poly(methyl methacrylate)/poly(octyl acrylate) and poly(octyl acrylate)/poly(methyl methacrylate) latex interpenetrating polymer networks

Two latex interpenetrating polymer networks (LIPNs) were synthesized with methyl methacrylate (MMA) and octyl acrylate (OA) as monomers, respectively. The apparent kinetics of polymerization for the LIPNs was studied. This demonstrates that network II does not have a nucleus formation stage. The monomers of network II were diffused into the latex particles of network I and then formed network II by in situ polymerization. It indicates that the polymerization of network I obeys the classical kinetic rules of emulsion polymerization. But the polymerization of network II only appears a constant‐rate stage and a decreasing‐rate stage. The apparent activation energies (E_a) of network I and network II of PMMA/POA were calculated according to the Arrhenius equation. The E_a values of POA as network I (62 kJ/mol) is similar to that of POA as network II PMMA/POA (60 kJ/mol). However, the E_a value of PMMA as network II POA/PMMA (105kJ/mol) is higher than that of PMMA as network I (61 kJ/mol). Results show that the E_a value of the network II polymerization is related to the properties of its seed latex. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Miscibility and mechanical properties of poly(styrene-co-4-vinylpyridine) and poly(butyl acrylate-co-acrylic acid) ionomer blends

The miscibility of polystyrene with poly(butyl acrylate) is very poor. Ionic interactions have been utilized recently as miscibility enhancers. In this paper, dynamic mechanical studies indicate that ion pair–ion pair interactions can be utilized to achieve miscibility in blends of polystyrene and poly(butyl acrylate). The styrenes contain 0–15mol% quaternary ammonium salt of 4-vinylpyridine, while the butyl acrylates contain 0–15mol% potassium acrylate groups. The miscibility increases with increase of ion content. When the ion content exceeds 11mol%, the polymers can be completely miscible. The mechanical properties of the ionomers and their blends were also studied. The results indicate that the tensile strength of ionomer blends is higher than that of corresponding poly(butyl acrylate-co-potassium acrylate)s (PBA-AA-K). The elongation at break of ionomer blends is higher than that of the corresponding poly(styrene-co-N-methyl-4-vinylpyridinium iodide) (PS-4VP-Q). © 1998 SCI.     

胶乳型互穿网络聚合物的研究

综述了胶乳型互穿网络聚合物的研究,着重介绍了合成工,乳胶粒形态结构的影响因素,同时亦对胶乳型互穿网络聚合物的性能作了介绍。     

Studies with gradient polymers of polystyrene and poly(methyl acrylate)

A series of [net-polystyrene]-ipn-[net-poly(methyl acrylate)] systems with gradients of poly(methyl acrylate) in a polystyrene matrix are prepared and tested mechanically. The results showed no distinct differences from that of corresponding interpenetrating polymer network (IPN) samples with similar compositions, in contrast to the substantially improved fracture strains obtained for [net-poly(methyl methacrylate)]-ipn-[-net poly(methyl acrylate)] gradient systems and their nongradient IPN's in our previous work. Hence, it is concluded that the toughening effect of gradient structure observed is not universally applicable for all gradient systems but it is unique for the acrylic system studied. Moduli-temperature responses and dynamic mechanical spectra of gradients and IPN's prepared in the current study are also presented. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 1721–1725, 1999