含氨丙基聚硅氧烷的动态力学性能研究

本文介绍了含氨丙基聚硅氧烷的有效合成途径,制备了数种不同分子量、不同氨丙基含量的含氨丙基聚硅氧烷.通过扭辫分析法测定了系列含氨丙基聚硅氧烷在不同温度下的内耗及相对刚度,对其进行了动态力学性能分析.     

有机硅-聚氨酯-环氧树脂三元共聚物的合成及表面性能研究

以甲苯-2,4-二异氰酸酯(TDI)、聚醚二元醇为主要原料制得-NCO封端的预聚体,并按一定比例和环氧树脂E-51混合均匀;另用3-氨丙基三乙氧基硅烷(硅烷偶联剂550)、八甲基环四硅氧烷(D4)合成一系列分子量不同的氨丙基聚硅氧烷,利用多元胺作固化剂,合成一系列氨丙基聚硅氧烷改性聚氨酯/环氧共聚物。测试了材料的力学性能、表面接触角、吸水率,同时对材料进行了表面电子能谱(ESCA)分析。结果表明:氨丙基聚硅氧烷-聚氨酯-环氧三元共聚物具有良好的拉伸强度、疏水性能以及较低的表面张力。     

含氨烷基聚硅氧烷的研究进展

对含氨烷基聚硅氧烷的研究进行综述，着重介绍含氨烷基聚硅氧烷的种类，性能特点，制备方法及应用等。     

酰化改性氨基聚硅氧烷的膜形貌与应用性能相关性研究

用原子力显微镜(AFM)和接触角测量仪对丁内酯改性氨基聚硅氧烷的膜形貌及其排列方式进行研究,并与应用性能进行分析.结果发现,不同氨基聚硅氧烷所形成的膜形貌不同,膜的表面形貌实际上与基团的排列方式有关,氨乙基氨丙基聚硅氧烷在单晶硅基底上形成均匀、平整、光滑的疏水膜;而丁内酯改性的氨乙基氨丙基聚硅氧烷则形成凹凸不平、粗糙的具有一定亲水性的非均匀膜.由于膜形貌存在很大差异,这可能就是造成不同氨基聚硅氧烷性能差异的主要原因.     

新型聚硅氧烷增塑剂的制备及其在单组份脱醇型室温硫化硅橡胶中的应用研究

以有机硅单体生产中的副产物作为原料,制备了新型聚硅氧烷增塑剂,并利用红外吸收光谱和核磁共振对其结构进行了表征。将此法制得的粘度为85MPa·s的新型聚硅氧烷作为增塑剂应用到单组份脱醇型室温硫化硅橡胶中。研究发现,添加了新型聚硅氧烷作为增塑剂的RTV硅橡胶产品符合GB16776-2005建筑用硅酮结构密封胶的要求。与市面同类产品比较,在拉伸强度和伸长率上都有所提高。     

亲水性硅橡胶的制备

通过γ-氨丙基三乙氧基硅烷(KH550)和正硅酸乙酯(TEOS)的水解反应来制备超支化有机硅聚合物,并将制备的超支化有机硅聚合物加入到端羟基聚二甲基硅氧烷(PDMS)中,固化后得到亲水性硅橡胶。采用傅里叶变换红外吸收光谱仪(IR)、接触角测定仪对制备的硅橡胶进行了表征,同时测定了硅橡胶的力学性能。结果表明,超支化有机硅聚合物可以显著改善硅橡胶的亲水性,降低硅橡胶与蒸馏水的接触角,并在一定程度上提高硅橡胶的力学性能。     

氨丙基功能化二氧化硅的制备及结构表征

分别采用液相法和溶胶-凝胶法制备了氨基功能化的二氧化硅(APS),利用FTIR,BET,元素分析和TG等技术对制备的APS进行了结构表征.在液相法制备APS的过程中,为使SiO2表面有更多的羟基与氨丙基三乙氧基硅烷(APTES)发生反应,采用4种方法对SiO2表面进行了预处理.结果表明,微波辐射效果最好,可使SiO2表面羟基数由1.08(个/nm2)增加到1.29(个/nm2).采用液相法制备的APS中氨丙基负载量为8.59%(质量分数),活性位(氨丙基)浓度为1.49mmol/g.采用溶胶一凝胶法制备的APS中氨丙基负载量为6.88%(质量分数),活性位(氨丙基)浓度为1.19mmol/g,均较液相法制备的APS低.     

有机硅树脂部分

20051243 含活性硅嵌段聚合物的护发素，20051244 硅橡胶接枝共聚物的制备方法及基抗冲击热塑性组成物，20051245 聚合物混合相分离机制制备多子LPDMS膜，20051246 脱氢偶合催化剂存在下制备氨基官能的烷氧基聚硅氧烷的方法，……     

乳液法合成氨基聚硅氧烷的研究

在碱性催化剂作用下,采用八甲基环四硅氧烷(D4)与硅烷偶联剂γ-氨丙基三乙氧基硅烷(KH-550)乳液共聚制得了氨基聚硅氧烷乳液.考察了八甲基环四硅氧烷(D4)在碱性条件下的温度、pH值、反应时间以及乳化剂复配和用量、偶联剂用量等影响单体转化率、乳液稳定性及聚合物分子量的因素.实验结果表明:当乳化剂总用量为15%～25%,反应温度在75～85℃,反应pH值为11～13,反应时间为6～8h的条件下,可以得到稳定的有机硅聚合物乳液.     

聚硅氧烷接枝与嵌段改性对水性聚氨酯性能的影响

以α-丁基-ω-|3-[2-羟基-3-(N-甲基-N-羟乙胺基)丙氧基]丙基|聚二甲基硅氧烷和α,ω-双[3-(1-甲氧基-2-羟基-丙氧基)丙基]聚硅氧烷为原料,合成了聚硅氧烷接枝和嵌段改性聚氨酯水分散体,考察了改性方法及加料顺序对水性聚氨酯胶膜性能的影响.结果表明,在聚硅氧烷含量相同的条件下,胶膜的耐水性和耐溶剂性...     

含氢硅油交联RTV硅橡胶的形态与性能

研究了两种不同氢基含量的含氢硅油对室温硫化硅橡胶力学性能、电学性能以及硫化时间的影响。结果表明,低含氢量的含氢硅油比高含氢量硅油显示出了更好的交联效果,且当其添加量为基础胶料质量的4%时,硫化硅橡胶显示出最好的综合性能。     

Blends of ultrasonically devulcanized tire-curing bladder and butyl rubber

The devulcanization of the butyl rubber based tire-curing bladder was carried out with a grooved barrel ultrasonic extruder. The devulcanized rubber was blended at different ratios with the carbon black filled virgin butyl rubber and cured. The rheological and mechanical properties, as well as gel fraction and crosslink density of the revulcanized rubber and vulcanizates of blends have been measured. The blend of ground tire-curing bladder and carbon black filled butyl rubber has also been prepared for comparison purpose. Compared to the blend containing the ground rubber, compounding of the blends containing the devulcanized bladder were easier and their vulcanizates had smoother surface. In addition, the vulcanizates containing devulcanized tire-curing bladder and virgin rubber showed substantially improved mechanical properties than the vulcanizate of the devulcanized rubber alone.     

超细绢云母/加成型液体硅橡胶复合材料的制备及性能

以天然绢云母矿物为原料,利用气流磨超细粉碎、乙烯基三乙氧基硅烷表面修饰处理对绢云母进行深加工,得到有机化的绢云母超细粉体,再采用溶液聚合方法制备出具有优良性能的超细绢云母/加成型液体硅橡胶复合材料。用SEM对其微观形貌进行了观察和分析,通过观察SEM可以发现经偶联剂表面修饰处理后超细绢云母在硅橡胶基体中分散均匀。当超细绢云母质量分数为8%时,复合材料的拉伸强度和邵氏硬度达到了1.25 MPa和61,分别比纯硅橡胶提高了197.62%和48.78%。TGA测试结果表明,超细绢云母可显著提高硅橡胶的热稳定性能。此外,用Kraus方程对超细绢云母与硅橡胶之间的相互作用进行了表征。      

硅橡胶表面壳聚糖载铜凝胶涂层的制备及其抗菌功能

在硅橡胶表面制备一种具有抗感染功能的涂层—壳聚糖载铜凝胶涂层。为了克服硅橡胶的生物惰性,在其表面制备涂层,先用逐步化学接枝法对其表面进行活化预处理,然后化学接枝壳聚糖载铜凝胶涂层。对比浸泡前后涂层的形貌,研究了活化预处理对功能化涂层与硅橡胶基体之间结合性能的影响。结果表明,用化学接枝法可在硅橡胶表面生成丰富的活性官能团从而提高了功能化涂层与硅橡胶的结合强度。载铜功能化涂层使硅橡胶导管具有良好的抗菌功能。     

Novel polysiloxane microspheres: Preparation and application in chlorinated butyl rubber (CIIR) damping composites

Polysiloxane microspheres (PSM) were prepared from a linear siloxane polymer by a simple emulsion procedure. Then, novel modified polysiloxane microspheres (MPSM) containing Si-OH groups were generated by introducing of organic hindered phenol groups, which were exploited for the functionalization of the microspheres with hydroxyl groups. The structure and properties of PSM and MPSM were revealed by various analysis, such as FTIR, XRD, SEM, TG, BET, etc. These polysiloxane microspheres, PSM and MPSM, were then used as rubber reinforcing fillers. The PSM and MPSM offered obvious effects on the properties of chlorinated butyl rubber (CIIR) and can improve its damping performance in a different agree. In addition, thermal stability, thermal conductivity, tensile properties, and toughing and damping mechanisms of the rubber composites were also investigated.     

电子束辐射交联硅橡胶的力学性能及导热性能

采用导热无机填料氧化铝对甲基乙烯基硅橡胶进行改性,并采用电子束辐射交联硅橡胶,对辐射交联硅橡胶的力学性能及导热性能进行了研究。结果表明,随着辐射剂量的增加,硅橡胶的交联密度增大,拉伸断裂强度逐渐增加,当辐射剂量为30kGy时,强度出现极大值;断裂伸长率则随着辐射剂量的增加而逐渐下降。随着白炭黑含量的增加,硅橡胶的拉伸断裂强度及断裂伸长率均逐渐增加。导热无机填料氧化铝的加入能够有效地提高硅橡胶的导热率。随着氧化铝含量的增加,硅橡胶的导热系数逐渐增大,共混体系的拉伸断裂强度和断裂伸长率下降,硬度增加。     

Short fibre elastomer composites: effect of fibre length,orientation, loading and bonding agent

A series of short fibre reinforced styrene butadiene rubber (SBR) composites were prepared by incorporating sisal fibres of different lengths and different concentrations. The vulcanization behaviour and the properties of the vulcanizates were measured by the relevant ASTM procedures. The processing characteristics such as green strength and mill shrinkage were improved by the addition of fibres. The properties like tensile strength, tear strength, moduli at 10% and 20% elongations were found to be maximum for composites containing longitudinally oriented fibres of length 6 mm. Mixes containing 35 phr loading of fibres and bonding agent showed better mechanical performance than others. The failure behaviour of tensile and tear specimens have been analysed by scanning electron microscopy techniques. Paper presented at the poster session of MRSI AGM VI, Kharagpur, 1995     

Effect of different curing systems on the mechanical and physico-chemical properties of acrylonitrile butadiene rubber vulcanizates

In the present study, the effect of different curing systems including sulfur, dicumyl peroxide, dicumyl peroxide/coagent and radiation/coagent on the mechanical and physico-chemical properties of acrylonitrile butadiene rubber (NBR) was studied. In order to correlate, the effect of curing systems on rubber, the comparison was carried out at comparable value of volume fraction of rubber in swollen gel (V_r) for NBR vulcanizates. Mechanical properties like tensile strength, elongation at break, modulus, Young’s modulus, tearing strength and abrasion loss of vulcanizates have been followed up for comparison. In addition, physico-chemical properties like swelling ratio, soluble fraction, and cross-link density were investigated. On the other hand, the effects of fuel, thermogravimetric analysis, and thermal ageing have been studied.     

Hybrid filler system for nitrile rubber vulcanizates

Relative efficiency of different types of fillers e.g., phenolic resin, carbon black and carbon black plus phenolic resin hybrid system in nitrile rubber vulcanizates for improvement of physico-mechanical properties, resistance to swelling in oil/fuel and thermal stability has been studied. The hybrid system was always found to offer maximum benefit in strength and dynamic mechanical properties coupled with higher percent of (a) retention of physical properties due to aging and (b) swelling resistance in oil or fuel. Both thermogravimetric analysis (TGA) as well as thermomechanical analysis (TMA) reflect much better thermal stability for the combined filler system compared to the vulcanizates containing either phenolic resin or carbon black.     

Modified phosphate pigments as high performance reinforcing materials for rubber vulcanizates

This study is focusing on the synthesis of novel modified micronized phosphate pigments as reinforcing materials for the vulcanizates of styrene-butadiene rubber (SBR), natural rubber (NR) and their blends. The metal phenyl phosphate pigments were prepared via co-precipitation process from the reaction of equimolar ratios of the disodium phenyl phosphate solution and the water soluble salts of the investigated metals. The white prepared phosphate pigments were introduced in the rubber formulations to replace carbon black the highly common and commercial reinforcing material in rubber vulcanizates. The rheometric characteristics, physico-mechanical properties in addition to the accelerated aging properties of the rubber vulcanizates were investigated, discussed and interpreted in the light of previous studies. The results showed that, phenyl phosphate pigments exercised a great effect on the rheological characteristics (scorch time, cure time…etc.), and achieved high performance and pronounced mechanical properties. The stress and strain at yield and at rupture of the loaded rubber with modified phosphates are better than that loaded with carbon black and Hisil e.g. tensile strength data were (20.0–23.4), 18.01 MPa and 15.05 for rubber blend vulcanizates loaded with 30 phr of modified phosphate pigments, carbon black and Hisil, respectively.