不变黄HDI-PU/P(MMA-HEMA)互穿网络胶粘剂形态与性能的研究翁祥

制备了HDI(1,6-己二异氰酸酯)型聚酯聚氨酯/聚(甲基丙烯酸甲酯-甲基丙烯酸-β羟乙酯)(HDI-PU/P(MMA-HEMA))互穿网络胶粘剂,研究了接枝剂甲基丙烯酸-β羟乙酯(HEMA)用量对其形态、性能与分子结构的影响。结果表明,接枝剂HEMA可使分散相接枝到连续相中形成复合网络,从而改善其界面的相容性,提高其胶液粘度和初粘力,并可广泛作为制鞋工业用胶。     

聚氨酯/聚甲基丙烯酸甲酯互穿网络的阻尼性能及相态

引言聚合物互穿网络体系由于在其形成过程中产生特殊的物理拓扑结构,使得该体系是一种永久缠结在一起的聚合物"合金"[1]。同时,由于构成该体系的聚合物组分往往不相容或部分相容,在其形成     

聚氨酯/聚甲基丙烯酸甲酯SIPN耐磨轴承材料的研究

采用共混浇注方法制备了强度、硬度、耐磨性和耐水性等综合性能良好的聚氨酯/聚甲基丙烯酸甲酯半互穿网络体系(PU/PMMA SIPN),用于制备新型轻质耐磨轴承材料,并系统研究了不同配比组分的力学性能、耐磨性能和耐水性能等,利用扫描电子显微镜等手段观察了各个体系的微观形貌,从而得出各个体系的最佳配比。结果表明,当PMMA的质量分数为30%时其综合性能最好,此时拉伸强度为14.15 MPa,比纯PU的8.50 MPa提高了66%;相对体积磨耗量为229.8 mm3,比纯PU的283.2 mm3下降29%;同时吸水率为0.58%,比纯PU的0.68%下降15%。     

氰酸酯/聚甲基丙烯酸甲酯互穿聚合物网络的探究

用同步法合成了氰酸酯/聚甲基丙烯酸甲酯(CE/PMMA)互穿聚合物网络(IPN),研究了甲基丙烯酸甲酯(MMA)含量对CE/PMMA-IPN体系力学性能及密度的影响。结果表明CE/PMMA-IPN体系的性能比单一树脂的优异。     

SIN型聚氨酯无“三苯”鞋用胶粘剂的研制

采用互穿网络理论,用丙烯酸酯（甲基丙烯酸甲酯MMA、丙烯酸丁酯BA、丙烯酸）对聚氨酯进行改性,在无苯溶剂体系下合成高性能环保型鞋用胶粘剂,并讨论溶剂、固化剂对粘接性能的影响,通过批量生产和使用,表明该鞋用胶粘剂初粘力大、粘接强度高、适用性广、综合性能达到国内先进水平。     

聚甲基丙烯酸甲酯/环氧树脂互穿网络复合物的性能研究

使用环氧树脂（EP-618）对作为人工义齿材料的聚甲基丙烯酸甲酯进行了共混改性,通过使用胺类固化剂（XCT-802）、甲基六氢邻苯二甲酸酐（MeHHPA）及2-乙基-4-甲基咪唑（2E4MZ）3种不同类型的固化体系,经过物理共混及化学反应的方法制备出具有互穿网络结构的聚甲基丙烯酸甲酯／环氧树脂二元复合物,并讨论了不同环氧树脂用量对该复合物力学性能的影响。     

蓖麻油聚氨酯／聚甲基丙烯酸甲酯互穿网络聚合物的研究

本文用同步法合成了蓖麻油聚氯酯/聚甲基丙烯酸甲酯(CO-PU/PMMA)互穿网络聚合物(IPN),用付里叶红外跟踪了 IPN 的生成过程。对不同组成比 IPN的形态及性能进行了研究。结果表明:该 IPN 属相容性较差体系,成网不同步和聚合物热力学上的不相容是产生相分离的主要原因。加入网间接枝剂及改变 PU 网络的3OH/2OH 比值都可以有效地改善该 IPN 相容性。     

双酚F环氧/聚甲基丙烯酸甲酯互穿网络的研究

合成了双酚F环氧树脂(BPFER),测定了其环氧值。用同步法制备了不同配比的双酚F环氧树脂/聚甲基丙烯酸甲酯互穿聚合物网络(BPFER/PMMAIPN),讨论了配比对IPN的力学性能和热性能的影响。用透射电子显微镜对IPN进行了形态分析。     

聚氨酯／聚烯烃互穿网络粘合剂的研究

制备了聚酯聚氨酯／聚丙烯酸酯及其它乙基单体聚合物热塑性互穿网络弹性体，将其溶解于溶剂中形成聚氨酯／聚烯烃粘合剂。考察了乙烯基单体的种类、用量、聚酯分子量、热活化时间等对粘合剂粘合性能的影响，同时测定了互穿网络弹性体的形态结构。     

聚醚型聚氨酯鞋用胶粘剂的研制

采用聚四氢呋喃（PTHF）为柔性链段，制备端羟基聚氨酯预聚体，并就聚醚段相对分子质量控制，聚醚段相对分子质量对聚氨酯胶粘剂粘接力的影响等进行了研究。本胶粘剂可用多异氰酸酯为固化剂室温固化，适用于冷粘制鞋等行业。     

聚氨酯/环氧树脂互穿网络聚合物反应动力学

通过共混法制备了聚氨酯(PU)/环氧树脂(EP)互穿网络聚合物(IPN),采用示差扫描量热法(DSC)和动态机械分析(DMA)对IPN形成过程中的固化反应动力学及产物IPN的相容性进行了研究,结果表明,m(PU)/m(EP)=10∶6的IPN体系的反应级数为0.95,表观活化能为169.23 kJ/mol;PU/EP IPN只有1个玻璃化转变温度,相容性好。     

聚氨酯/乙烯基树脂互穿聚合物网络的研究进展

综述了聚氨酯/乙烯基树脂互穿聚合物网络（PU/VER IPNs）中两组分的聚合机理;重点讨论了分步IPNs、同步IPNs和胶乳IPNs的制备方法及其研究进展;介绍了PU/VER IPNs合成动力学的研究方法,包括化学滴定法、差示扫描量热法和傅立叶变换红外光谱法。     

Polyisobutene/polystyrene interpenetrating polymer networks: Effects of network formation order and composition on the IPN architecture

In order to improve polyisobutene (PIB) mechanical properties, a PIB network is combined with a polystyrene (PS) one into an interpenetrating polymer network (IPN) architecture. PIB network is formed by alcohol addition between the hydroxyl end groups of a telechelic dihydroxy-polyisobutene and a pluri-isocyanate. PS network is synthesized by free-radical copolymerization of styrene with divinylbenzene. Thus, the optimal synthesis conditions are determined by FTIR spectroscopy and the kinetics of the alcohol-isocyanate addition is studied in detail. A short kinetic study of the PS network formation inside the PIB network is also carried out. The highest degree of interpenetration is obtained by forming the PIB network first. The corresponding transparent IPNs exhibit two mechanical relaxations corresponding to those of PS and PIB enriched phases. However, mechanical properties of PIB networks are tremendously improved by the presence of a PS network in such IPN architectures.     

Characteristics and performance of electroactive paper actuator made with cellulose/polyurethane semi‐interpenetrating polymer networks

This article introduces a cellulose/polyurethane (PU) semi‐IPN‐based electroactive paper (EAPap) actuator. The fabrication process, bending actuation test, and its characteristics are explained. For the fabrication of cellulose/PU semi‐IPN EAPap actuator, cotton cellulose was dissolved into N,N‐dimethylacetamide (DMAc) and lithium chloride (LiCl) solvent system. PU prepolymer prepared by poly[di(ethylene glycol) adipate] and hexamethylene diisocyanate (HDI) was mixed with DMAc cellulose solution by stirring. The mixed solution was spin‐coated on a wafer and cured to form cellulose/PU semi‐IPN films using 1,1,1‐tris(hudroxymethyl)propane as the crosslinker. The characteristics of the cellulose/PU semi‐IPN film were investigated by FTIR, scanning electron microscopy (SEM), X‐ray diffraction pattern (XRD), and tensile test. The bending actuation performance of the actuator was evaluated in terms of free bending displacement with respect to the actuation frequencies, voltages, and humidity levels. It shows a good bending actuation at room humidity condition. The actuation principle of the actuator is also discussed. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Kinetics of phase separation in polyurethane/polystyrene semi-1 interpenetrating polymer networks. 1. Light transmission studies

The phase separation of different in-situ semi-1 interpenetrating polymer networks (IPNs) based on polyurethane and polystyrene has been followed by light transmission. The effect of the presence ab initio of small amounts of homopolystyrene in the initial reaction mixture on the phase separation process has also been examined. If gelation of the polyurethane occurs before the onset of phase separation, the latter is impeded or strongly limited, and transparent semi-1 IPNs are obtained. In the opposite case, phase separation is macroscopic and the material is turbid.     

High-resolution thermogravimetric analysis of polyurethane/poly(ethyl methacrylate) interpenetrating polymer networks

Thermal degradation of a series of polyurethane/poly(ethyl methacrylate) interpenetrating polymer networks and their constituent networks were studied by three modes of thermogravimetric analysis: the conventional method, the constant reaction rate method, and the dynamic rate technique. The best understanding of the degradation mechanism was achieved by the last method, which allows much better resolution of overlapping events. In addition, the weight losses correspond well with the results obtained from the constant reaction rate analysis, but are achieved in shorter times. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 287–295, 1998     

Study on phase behavior–impact strength relationship of unsaturated polyester/polyurethane hybrid polymer network

The phase behavior of a hybrid polymer network (HPN) composed of poly[(propylene glycol maleate)-co-(propylene glycol phthalate)] crosslinked with styrene and polyester–urethane crosslinked with methylene-bis-ortho-chloroaniline was examined. The correlation between phase separation and impact strength of the HPNs is discussed. The composition of HPNs has an effect on their properties.     

Mechanical and morphological study of polyurethane/polystyrene interpenetrating polymer networks containing ionic groups

The viscoelastic and mechanical properties and the morphology of polyurethane (PUR)/ olystyrene (PS) interpenetrating polymer networks (IPNs) containing ionic groups have been investigated. Dynamic mechanical thermal analysis (DMTA) revealed a pronounced change in the viscoelastic properties upon the introduction of ionic groups. For the 70 : 30 and 60 : 40 PUR/PS IPN compositions, the DMTA data changed from a dominant PUR to a dominant PS loss factor peak. Higher intertransition loss factor values indicated a significant improvement of IPN component mixing with increasing ionic content. The stress at break values increased only moderately, whereas sharp rises in Young's modulus and hardness values were found at 2 wt % ionic groups. At the same time, the strain at break values decreased by half. Scanning and transmission electron microscopy (TEM) indicated a grossly phase-separated morphology for the 70 : 30 PUR/PS IPN without ionic groups. With increasing methacrylic acid (MAA) content, the PS phase domain sizes decreased. At 2 wt % of ionic groups, a TEM micrograph showed interconnected PS phase domains resembling a network structure. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1973–1985, 1998