TiO2/MQ硅树脂反应型杂化材料的制备及其性能研究

以钛酸丁酯、MQ硅树脂为原料,利用溶胶-凝胶法制备了TiO2/MQ硅树脂无机-有机杂化材料.采用傅里叶变换红外光谱(FT - IR)、紫外-可见光谱、热重分析仪(TGA)、X-射线衍射仪(XRD)、扫描电镜(SEM)表征杂化材料的结构与性能.结果表明:杂化材料中存在Ti-O-Si共价键合;杂化材料对可见光吸收极低,对紫...     

添加型抑制剂对高温硫化加成型硅橡胶性能的影响

比较了10种添加型抑制剂对高温硫化加成型硅橡胶的室温硫化活性、高温硫化性能、力学性能和加工性能的影响,确定适宜作高温硫化加成型硅橡胶抑制剂的化合物为马来酸二烯丙酯和富马酸二乙酯,使用这两种抑制剂制备的胶料的力学强度较好,拉伸强度分别达到9.08 MPa和9.84 MPa;而且贮存稳定性较好,室温下ts1-s可达到24 ...     

有机硅专业论文英文摘要中的常见错误和语言特点

指出了有机硅专业英文摘要中存在的问题,针对有机硅专业论文的特征,从词和句两方面,分析了有机硅专业论文的语言特点。     

功能化POSS对硅橡胶力学性能的影响及机理研究

研究了八聚笼型倍半硅氧烷(POSS)功能化侧基的种类和用量对硅橡胶力学性能的影响。结果表明,POSS的加入使硅橡胶的拉伸强度和断裂伸长率均下降,硬度均提高。乙烯基POSS的加入显著延长了硅橡胶的正硫化时间。POSS的加入能显著降低硅橡胶的压缩永久变形,乙烯基POSS的效果比甲基POSS好;且乙烯基含量越高,压缩永久变形越小。分析了功能化POSS对硅橡胶力学性能的影响机理。     

A novel electric elastomer based on starch/transformer oil drop/silicone rubber hybrid

The electrorheological fluid composed of starch particles and silicone oil/transformer oil was dispersed into 107 silicone rubber, and then two types of electric elastomers were prepared in the absence and presence of a curing electric field, respectively. The storage modules were measured using dynamic mechanical analysis with the round disk compression clamp. The results indicate that the storage modulus sensitivity of electric elastomers composed of pure transformer oil is the highest, that of electric elastomers composed of pure silicone oil takes second place, and that of electric elastomers composed of mixture oil is the smallest. For the given starch concentration, the storage modulus sensitivity attains a maximum value of 3.88 when the mass ratio between the transformer oil and 107 silicone rubber is 1. For the given mass ratio of 1, the effects of starch concentration and the presence or absence of the curing electric field on the storage modulus of electric elastomers were studied. When the starch concentration is 5 wt %, the storage modulus of the elastomer without the electric field (denoted as A‐elastomer) is 20.1 kPa, whereas that of the elastomer with the electric field (denoted as B‐elastomer) is 101.8 kPa. The storage modulus sensitivity attains a maximum value of 4.07. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Synthesis,characterization, and properties of silicone–epoxy resins

Silicone–epoxy (SiE) resins were synthesized through the hydrolytic condensation of 2‐(3,4‐epoxycyclohexylethyl) methyldiethoxysilane (EMDS) and the cohydrolytic condensation of EMDS with dimethyldiethoxysilane. Structural characterization was carried out by ¹H‐NMR, ²⁹Si‐NMR, and mass spectrometry analysis; the resins were linear oligomers bearing different numbers of pendant epoxy groups, and the average number of repeat Si O units ranged from 6 to 11. Methyhexahydrophthalic anhydride was used to cure the SiE resins to give glassy materials with high optical clarity. The cured SiE resins showed better thermal stability and higher thermal and UV resistances than a commercial light‐emitting diode package material (an epoxy resin named CEL‐2021P). The effect of the epoxy value on the thermal and mechanical properties and the thermal and UV aging performances of the cured SiE resins were investigated. The SiE resins became more flexible with decreasing epoxy value, and the resin with the moderate epoxy value had the highest thermal and UV resistances. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

钢结构防火防腐涂料的制备与研究

现代建筑结构所用的主要材料仍是钢铁、混凝土和玻璃。钢铁强度高,性能稳定,韧性好而且适合于批量生产,使得钢铁成了最佳建筑用结构材料。但是钢结构在应用过程中存在着两大看不见的隐患:火灾和腐蚀。低的耐火性能和易腐蚀性可以导致较大的人员伤亡和巨大的经济损失。而采用涂料进行保护是一种最经济、最有效的保护方法。本文在以有机硅改性丙烯酸树脂为基料,聚磷酸铵、双季戊四醇和三聚氰胺为防火填料的钢结构超薄膨胀型防火涂料中,分别加入三聚磷酸铝防锈颜料、金红石型二氧化钛、纳米二氧化硅和陶瓷粉,制备了兼具防火和防腐性的双功能涂料,其性能指标符合GB/T 14907—2002标准要求,耐火极限达109min,涂层阻抗达10~8～10~9Ω·cm~2,且具有优良的耐化学试剂性。该涂料施工方便,性能优异,为大型钢结构的防火和防腐蚀保护提供了一个较好解决方案。     

有机硅氧烷改性丙烯酸乳液合成及性能研究

通过乳液聚合法,用羟基硅油与硅烷偶联剂A-151(乙烯基三乙氧基硅烷)或KH-570(γ-甲基丙烯酰氧基丙基三甲氧基硅烷)对丙烯酸酯进行化学改性,借助硅烷偶联剂中的碳碳双键和硅氧烷结构将羟基硅油与丙烯酸酯连接起来。然后利用红外光谱(FT-IR)对改性丙烯酸酯的微观结构进行表征,研究结果表明:Si—O键成功地共聚到了丙烯酸长链中。并对改性后乳液的各项性能进行对比,结果发现通过KH-570改性后的丙烯酸酯乳液在各项性能上都有明显的提升。     

用液饼高度法测定水在硅聚合物表面的接触角

用半永久性离型剂(SP离型剂)涂复模具可以连续使用几十次到近百次.这项技术上的进步给铸造工艺带来巨大的经济效益和社会效益.目前用于树脂模具的SP离型剂中的成膜剂很多采用反应性硅聚合物.市场上的SP离型剂的配方属于生产商的技术秘密,即使在专利中也难于找到硅聚合物SP离型剂的详细配方.同时文献上鲜有关于硅聚合物表面能的报道...     

预处理温度对高压直流电缆附件绝缘材料空间电荷的影响

采用电声脉冲法(pulsed electro-acoustic method,PEA)研究了经过不同预处理温度处理后的高压直流电缆附件绝缘材料——硅橡胶(silicone rubber,SIR)及三元乙丙橡胶(ethylene propylene diene monomer,EPDM)绝缘层的空间电荷分布。为分析导致此空间电荷积累不同的原因,采用拉伸性能测试和动态热机械分析(dynamic thermal mechanical analysis,DMA)研究了高压直流电缆附件绝缘材料化学分子结构的变化。实验结果表明,SIR材料经过150℃预处理后,硫化更充分、交联密度增加,从而使得绝缘层中的空间电荷量减少,因此SIR的预处理以150℃为宜;EDPM材料经过150℃预处理后,综合表现为解聚反应,从而使得绝缘层中的空间电荷量增加,因此EDPM预处理温度以80℃为宜。