Equilibrium adsorption of ethanol in polyurethane/vinyl ester resin interpenetrating polymer networks

研究了具有不同结构与形态的聚氨酯/乙烯基酯树脂互穿聚合物网络(IPN)的乙醇平衡吸收量,以探索这类IPN用作功能材料的可能性。结果表明,IPN中2个网络间的相容性和互穿程度对乙醇的平衡吸收量有很大影响。     

乙醇在聚氨酯/乙烯基酯树脂互穿网络中的平衡吸收

研究了具有不同结构与形态的聚氨酯／乙烯基酯树脂互穿聚合物网络（IPN）的乙醇平衡吸收量,以探索这类IPN用作功能的可能性,结果表明,IPN中2个网络间的相容性和互穿程序对乙醇的平衡吸收量有很大影响。     

互穿网络聚合物及其在涂料工艺中的应用（Ⅰ）

互穿网络聚合物（IPN）是一种新型复合物材料，是聚合物改性技术发展的新领域。本文从IPN原理与性能、阻尼涂料、聚氨酯涂料和高固体分涂料等方面探讨了IPN在涂料工艺中推广应用的前景。     

聚氨酯——聚丙烯酸酯互穿聚合物网络的力学性能

本文讨论了聚氨酯—聚丙烯酸醋互穿聚合物网络(Pu/PA IPN)的某些力学性能,拉伸强度,模量和冲击强度及其影响因素。这些因素有:丙烯酸酯聚合的引发剂用量,聚氨酯用多元醇的分子量、NCO/OH比值、Mc,pU与PA的比例等。由于两种聚合物互穿并形成永久性的缠结,从而提高了IPN的力学性能。     

聚醚聚氨酯／聚甲基丙烯酸甲酯互穿聚合物网络相容性的研究

用同步法合成了聚醚聚氨酯/聚甲基丙烯酸甲酯(PU/PMMA)互穿聚合物网络(IPN)。讨论了不同交联缠结程度对IPN形态及性能的影响,分析了影响IPN两网络相容性的热力学及动力学因素。增加网络的交联密度可有效地改善IPN网络间的相容性,同时,调节两网络生成速度基本同步,控制在热力学相分离发生前使两网络最大程度地互穿缠结,也能减小相分离的程度,改善IPN网络间的相容性。     

聚硅氧烷／聚氨酯IPN的初步研究

初步探讨了聚硅氧烷（PSiO)与聚氨酯（PU）形成互穿聚合物网络（IPN）结构的可能性及影响因素。     

高铁车辆阻尼用聚氨酯-聚丙烯酸酯互穿聚合物网络的合成及应用研究

利用互穿聚合物网络(IPN)结构,采用乳液聚合工艺,合成出聚氨酯-聚丙烯酸酯乳液。用DSC和流变仪等分析手段,对微相分离和阻尼性能情况进行了研究,并将合成获得的乳液聚合物应用于高铁车辆阻尼涂料中,该涂料具有宽温域高阻尼性能,可满足高铁车厢的实际需要。     

PU/EP/PPGDA三元IPN弹性体的结构研究

用红外光谱 (IR)、扫描电子显微镜 (SEM )、X光电子能谱 (XPS)研究了以聚氨酯 (PU)为第一网络的三元IPN聚氨酯 /环氧树酯 /聚丙二醇二丙烯酸酯 (IPNPU/EP/PPGDA)弹性体的互穿特性和形态结构。研究结果表明 ,各元素在三元IPN表面和内部分布不一致 ,表明三种聚合物在IPN中的分布是不均匀的 ,这种差异与IPN组成、组成聚合物间的相容性以及形态结构有密切联系     

聚氨酯互穿网络聚合物的力学性能及热稳定性研究

用光—热交替法合成了聚醚聚氨酯/蓖麻油聚氨酯互穿网络聚合物(IPN)。样品的表征结果表明,其热稳定性能在本体系存在一个最佳配比值。它为合成耐热材料提供了科学依据。     

丙烯酸酯改性水性聚氨酯的研究进展

简述了丙烯酸酯改性水性聚氨酯4种常用的改性方法:嵌段共聚改性、接枝共聚改性、核-壳乳液聚合改性和互穿聚合物网络改性(IPN);综述了国内外丙烯酸酯改性水性聚氨酯研究进展。     

IPN中聚氨酯固化反应动力学的FTIR研究

用傅立叶变换红外光谱(FTIR)研究纯聚氨酯弹性体和聚氨酯/聚二甲基硅氧烷IPN中聚氨酯的固化反应动力学。结果表明,在PU/PDMS IPN体系中聚氩酯的交联反应仍为二级反应,聚二甲基硅氧烷的存在大大降低了PU/PDMS IPN的交联速率,并提高了反应活化能。     

聚氨酯／呋喃树脂互穿聚合物网络性能的研究

用糠醇型呋喃树脂或ＨＦ９２００Ａ环氧型呋喃树脂与聚环氧丙烷醚型聚氨酯制备了互穿聚合物网络（ＩＰＮ）。通过红外光谱和扫描电子显微镜分析了聚氨酯（ＰＵ）／呋喃树脂（ＦＡ）ＩＰＮ网络形成的动力学和微相分离行为，并考察了不同配比下ＩＰＮ的力学性能。实验结果表明，ＰＵ／ＦＡ达到某一比值时，产生互穿聚合物网络的协同效应，可改善聚氨酯的刚性，提高呋喃树脂的抗冲击等性能     

Interpenetrating polymer networks of polyurethane and furfuryl alcohol,IIa. Processability and properties of pultruded fiber-reinforced composites

A feasibility study of pultrusion of fiber-reinforced polyurethane/furfuryl alcohol (PU/FA) interpenetrating polymer/network IPN composites has been made. From the viscosity study, it was found that the pot life of the PU/FA IPN prepolymers increased with PU content and showed high reactivity at elevated temperature. It was confirmed from the morphological study that the wetting of fibers by the PU/FA IPN resins was improved with PU content. The appearance of the tensile failure surfaces of the pultruded glass fiber-reinforced PU/FA IPN composites showed “hackle patterns” for PU contents below 15 phr. The mechanical property study shows that the tensile strength of pultruded PU/FA IPN composites is the highest when the PU content is 5 phr. However, the flexural strength, flexural modulus and HDT decreased with PU content. The mechanical properties of various fiber-reinforced (glass, carbon, and Kevlar 49 aramid fiber) pultruded PU/FA IPN composites increased with fiber volume content.     

聚氨酯/环氧树脂互穿网络聚合物硬质泡沫机械性能研究

采用同步法合成了聚氨酯/环氧树脂互穿网络聚合物(PU/EP IPN)硬质泡沫,对机械性能进行了研究。结果表明,与纯聚氨酯硬质泡沫相比,PU/EP IPN硬质泡沫的压缩强度和弯曲强度明显提高,在PU/EP IPN硬质泡沫中,随环氧树脂含量增加,PU/EP IPN硬质泡沫压缩强度和弯曲强度随之增大,当E-39D质量分数增加到24.2%时,PU/EP IPN硬质泡沫压缩强度和弯曲强度出现最大值;PU/EP IPN硬质泡沫机械强度随材料密度的增大而增加;随着环氧树脂中环氧值的增加,PU/EP IPN硬质泡沫的压缩强度、弯曲强度和拉伸强度均呈逐渐升高的趋势。     

Reinforcement of polyurethane/epoxy interpenetrating network nanocomposites with an organically modified palygorskite

An organophilic palygorskite (o‐PGS) prepared by the treatment of natural palygorskite with hexadecyl trimethyl ammonium bromide was incorporated into interpenetrating polymer networks (IPNs) of polyurethane (PU) and epoxy resin (EP), and a series of PU/EP/clay nanocomposites were obtained by a sequential polymeric technique and compression‐molding method. X‐ray diffraction and scanning electron microscopy analysis showed that adding nanosize o‐PGS could promote the compatibility and phase structure of PU/EP IPN matrices. Tensile testing and thermal analysis proved that the mechanical and thermal properties of the PU/EP IPN nanocomposites were superior to those of the pure PU/EP IPN. This was attributed to the special fibrillar structure of palygorskite and the synergistic effect between o‐PGS and the IPN matrices. In addition, the swelling behavior studies indicated that the crosslink density of PU/EP IPN gradually increased with increasing o‐PGS content. The reason may be that o‐PGS made the chains more rigid and dense. As for the flame retardancy, the PU/EP nanocomposites had a higher limiting oxygen index than the pure PU. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

三元互穿聚合物网络弹性体的合成与性能

合成了以聚氨酯 (PU)为第一网络的三元IPN聚氨酯 /环氧树脂 /聚丙二醇二丙烯酸酯 (IPNPU/EP/PPGDA)互穿聚合物网络。分析了IPN的力学性能和萃取特性 ,结果表明 ,三元IPN的组成对力学性能和萃取特性有明显影响。该种弹性体具有优异的耐溶剂性 ,乙酸乙酯连续热萃取率仅为 5 %～ 11%。综合性能优异的三元IPN弹性体组成为m(PU) /m(EP) /m(PPGDA) =70 /2 5 /5 ,其机械性能为 :Ts=34 7MPa ,E =437% ,回弹性R =37%     

Synthesis,thermal properties,and morphology of blocked polyurethane/epoxy full‐interpenetrating polymer network

Blocked polyurethane (PU)/epoxy full‐interpenetrating polymer network (full‐IPN) were synthesized from blocked NCO‐terminated PU prepolymer, with 4,4‐methylene diamine as a chain extender and epoxy prepolymer, with 4,4‐methylene diamine as a curing agent, using simultaneous polymerization (SIN) method. From FTIR spectra analysis it was found that the major reactions in the blocked PU/epoxy IPN system are the self‐polymerization of block PU/chain extender and the self‐polymerization of epoxy/curing agent. Meanwhile, from reaction mechanisms the copolymerization of IPN may have occurred at the same time. The weight loss by thermogravimetric analysis decreased with increasing epoxy and filler content. It was confirmed from scanning electron micrography (SEM) that when the blocked PU content increased, the microstructure of IPN became rougher. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 323–328, 2006     

Tribological mechanism improving the wear resistance of polyurethane/epoxy interpenetrating polymer network via nanodiamond hybridization

The excellent synergistic effect of physical/mechanical properties of polyurethane/epoxy (PU/EP) interpenetrating polymer network (IPN) and the validity of nanofilling have one potential to improve the wear resistance of polymeric materials. With the aim of practical application, PU/EP IPN nanocomposites are prepared with nanodiamond (ND) as a reinforcing additive. Results showed the uniform thermal stability and the excellent compatibility between PU and EP in ND‐hybridized PU/EP IPN. Simultaneously, ND particles work as crosslinked points improving the physical/mechanical properties of ND‐hybridized PU/EP IPN, especially the wear resistance. The measurement of tribological property and the scanning electron microscope indicated that the wear resistance is able to be improved a lot by the formation of IPN and by the addition of ND. Consequently, the tribological mechanism of PU/EP IPN nanocomposites comes into being. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40244.