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为了改善聚酰亚胺的加工性能,以对氨基酚和二氯二甲基硅烷为原料合成了一种含硅二胺活性单体双(4-氨基苯氧基)二甲基硅烷(简写APMSI),采用不同配比的APMSI和4,4’-二氨基二苯醚(ODA)混和胺与均苯四甲酸二酐(PMDA)共缩聚制得含硅聚酰亚胺.采用傅立叶变换红外光谱(FTIR)、核磁共振谱(1H和13C)、熔点测定仪对对乙酰氨基酚、双(4-氨基苯氧基)二甲基硅烷(APMSI)的结构进行了表征,其总产率达到67%.采用傅立叶变换红外光谱仪(FTIR)、差热分析仪(DTA)、热重分析仪(TG)和溶解实验分别对纯聚酰亚胺和含硅聚酰亚胺的结构、热性能和溶解性进行了表征.结果表明,含硅聚酰亚胺较纯聚酰亚胺耐热性低,但随含硅二胺单体增多而升高;其玻璃化转变温度随含硅二胺单体增多而大幅下降;其溶解性相对于纯聚酰亚胺有大幅提高. 相似文献
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以联苯四酸二酐(BPDA)和烯丙基胺为反应物,合成了N,N’-二烯丙基联苯双酰亚胺,该化合物在氯铂酸催化作用下与1,1,3,3-四甲基二硅氧烷通过硅氢加成反应合成了一种新型含硅聚酰亚胺(PI).研究表明:含硅链段的引入有助于提高聚酰亚胺材料的溶解性能和熔融加工性能.各步产物通过红外光谱(FT-IR)与核磁共振(1H-NMR)进行了结构表征,并通过热重分析仪(TGA)、示差扫描热分析仪(DSC)和尺寸排除色谱仪(SEC)对目标产物的热性能和分子量进行了测定研究. 相似文献
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国外有机硅材料研发动态 总被引:1,自引:0,他引:1
概述了国外有机硅材料最新研发动态.着重介绍了与电子工业、燃料电池有关的含硅材料和以含硅的聚酰亚胺、聚硅倍半氧烷为基础的材料,以及聚二茂铁硅烷和金刚烷为基础的有机硅氧烷等的性能和应用. 相似文献
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聚硅烷改性含硅芳炔树脂的耐热性能研究 总被引:1,自引:0,他引:1
含硅芳炔树脂具有优异的耐高温性能,在高温下可形成C/SiC有机无机杂化材料,用聚硅烷对含硅芳炔树脂进行改性以提高其含硅量。采用示差扫描量热(DSC)、红外光谱(FT-IR)分析了改性含硅芳炔树脂的固化行为,采用TGA考察了改性含硅芳炔树脂固化产物及其烧结物的热稳定性能,并用XRD对烧结物进行了分析。研究表明,改性后的含硅芳炔树脂黏度降低、硅含量提高;固化物和烧结物在1200℃下空气中的残留率均提高了40%以上;固化物经1450℃烧结后形成了β-SiC,含聚硅烷30%的改性树脂烧结物中SiC含量达到41%。 相似文献
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通过对HRB335(Ф28mm)螺纹钢的屈服强度和化学成分统计分析,建立和检验了多元回归方程,确定了其屈服强度和化学成分的相关性,及含硅量是影响屈服强度的主要因素,同时利用回归方程调整钢材的化学成分(特别是含硅量)以控制屈服强度,效果较好。 相似文献
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直接由SiO2低温合成含硅聚酯及其结构表征 总被引:5,自引:0,他引:5
研究了直接从无定型二氧化硅出发,与乙二醇、氢氧化钾反应,生成高反应活性的五配位硅钾化合物,并以此为原料与2-氯乙醇反应制备双羟基四配位有机硅单体,然后该单体再与对苯二甲酰氯进行低温溶液缩聚反应合成含硅聚酯,并对合成的物质作了红外光谱,热重分析、分子量测定、能谱元素分析等结构表征。 相似文献
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Florence Delor-Jestin Namrata S Tomer Raj Pal Singh Jacques Lacoste 《Science and Technology of Advanced Materials》2008,9(2)
Most applications of silicones are linked to their hydrophobic properties and (or) their high resistance to ageing (e.g. thermal ageing and photoageing). However, when placed in extreme environments, these materials can fail as in the case of epoxy/fiber glass composite powerlines insulators, where crosslinked polymethylsyloxanes (PDMSs) are used as the protective envelope (housing) of the insulator. We report on the behavior of both pure/noncrosslinked PDMSs and typical formulations used in industrial insulators, i.e. containing peroxide crosslinked PDMS, alumina trioxide hydrated (ATH) and silica. Special attention is paid on both (i) the sources of potential degradation and (ii) the best analytical methods that can be applied to the study of very complex formulations. (i) Aside from conventional types of ageing such as photo-ageing and thermal, hydrolytic, and service life ageings, treatments with acidic vapors, plasma and ozone possibly generating species from the reaction of a high electric field with air were also performed, which allowed to accelerate electrical and out-door ageings and to obtain differently aged materials. (ii) Aside from conventional analytical methods of polymer degradation such as FTIR/ATR spectroscopy and SEC, TG, hardness measurements, more specific methods like photo/DSC, TG/IR, thermoporosimetry, resistivity and density measurements were also performed to characterize the chemical and physical evolutions of polymer materials. In particular, it was found that treatment with nitric acid vapor has detrimental effects on the properties of both fire retardants (e.g. ATH) and PDMSs, affecting the hardness and resistivity of the formulated material. 相似文献
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AbstractMost applications of silicones are linked to their hydrophobic properties and (or) their high resistance to ageing (e.g. thermal ageing and photoageing). However, when placed in extreme environments, these materials can fail as in the case of epoxy/fiber glass composite powerlines insulators, where crosslinked polymethylsyloxanes (PDMSs) are used as the protective envelope (housing) of the insulator. We report on the behavior of both pure/noncrosslinked PDMSs and typical formulations used in industrial insulators, i.e. containing peroxide crosslinked PDMS, alumina trioxide hydrated (ATH) and silica. Special attention is paid on both (i) the sources of potential degradation and (ii) the best analytical methods that can be applied to the study of very complex formulations. (i) Aside from conventional types of ageing such as photo-ageing and thermal, hydrolytic, and service life ageings, treatments with acidic vapors, plasma and ozone possibly generating species from the reaction of a high electric field with air were also performed, which allowed to accelerate electrical and out-door ageings and to obtain differently aged materials. (ii) Aside from conventional analytical methods of polymer degradation such as FTIR/ATR spectroscopy and SEC, TG, hardness measurements, more specific methods like photo/DSC, TG/IR, thermoporosimetry, resistivity and density measurements were also performed to characterize the chemical and physical evolutions of polymer materials. In particular, it was found that treatment with nitric acid vapor has detrimental effects on the properties of both fire retardants (e.g. ATH) and PDMSs, affecting the hardness and resistivity of the formulated material. 相似文献
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有机硅改性环氧树脂的合成及其性能 总被引:5,自引:0,他引:5
采用数种有机硅氧烷合成了有机硅树脂,用有机硅树脂对环氧树脂进行化学改性,制得了有机硅改性环氧树脂。对改性后的树脂的结构和涂层的力学性能进行了分析,分析结果表明:改性后的有机硅改性环氧树脂综合了有机硅树脂和环氧树脂的优异性能,用其制得的涂层非常致密,具有良好的附着力、较高的硬度和优良的柔韧性。 相似文献
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以含氨丙基聚硅氧烷为基胶,含羧乙基聚硅氧烷为交联剂制备了新型高温硫化硅橡胶.通过实验我们确定了制备含氨丙基聚硅氧烷基硅橡胶的最佳条件,在此条件下制备的硅橡胶具有良好的机械性能.实验制备的硅橡胶的拉伸强度、撕裂强度、扯断伸长率和邵氏硬度分别为5.9MPa,26.6kN/m,260%和64ShA. 相似文献
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国内外有机硅材料发展动向与建议 总被引:3,自引:0,他引:3
全面论述快速增长的国内外有机硅发展现状;国外几大有机硅公司进入中国市场的情况;国际有机硅技术发展动向;以及国外有机硅工业成功经验及我国差距,并提出关于发展我国有机硅工业的若干建议。 相似文献
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以直接沉淀法合成了纳米氧化锌(ZnO),使用硅烷偶联剂对其进行表面改性,并制备了纳米ZnO与液体硅橡胶的复合材料,对改性前后纳米ZnO的结构进行了表征,并对复合材料的相关性能进行了研究。结果表明:通过接枝反应,硅烷偶联剂可以接枝到纳米ZnO表面,改性前后ZnO的晶型不发生变化;在较低添加量的情况下,纳米ZnO可以在一定程度上提高液体硅橡胶的力学性能,当添加量为2%时,改性前后纳米ZnO制备的液体硅橡胶复合材料的导热系数可以从0.189W/m.K分别提高到0.506W/m.K和0.61W/m.K。 相似文献