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含希夫碱基团的不对称弯曲型液晶分子的合成和相变研究
弯曲型 液晶 希夫碱 不对称
2014/3/28
以3-氨基-2-甲基苯甲酸为原料,合成了含希夫碱基团的5个不对称弯曲型液晶分子,通过1H NMR、HRMS测试手段对其结构进行了表征,采用示差扫描量热法(DSC)和偏光显微镜等方法研究了它们的液晶性和相变温度,发现不仅相变温度随着分子苯环数的下降而下降,其液晶相的稳定性也随着苯环数的下降而下降,含有5个苯环的化合物呈现多个近晶相和向列相,含4个苯环的化合物则只有一个近晶相和向列相,而3个环的化合物...
以对羟基苯甲酸(HBA)、4,4'-联苯二酚(HB)、1,3-二溴丙烷(DP)、对苯二甲酸(TA)为共聚物单体,玻纤为增强共聚组分,采用原位熔融缩聚的方法,一步混合直接投料聚合出全芳香族液晶共聚酯/玻纤原位复合材料。用核磁共振(1H NMR)、差热分析(DSC)、偏光显微镜(POM)、扫描电镜(SEM)等测试分析手段对复合材料的结构、热性能和液晶特性进行了表征。研究结果表明,合成所得的复合材料呈现...
应力锥橡胶材料在变温环境下的力学性能
橡胶材料 应力锥 本构关系 拉伸试验
2013/12/9
利用德国Zwick020材料试验机，进行高压电缆终端应力锥两种橡胶材料在不同温度环境下单向拉伸大变形力学行为的试验研究，得到不同温度和不同加载速率条件下材料的应力应变关系曲线，并分析了温度及加载速率变化对材料力学性能的影响.运用MooneyRivlin橡胶材料模型，对试验材料进行了理论分析，根据试验结果拟合出相关参数，构建了适用高压电缆终端应力锥两种橡胶材料的本构关系公式.对比不同温度下两种橡胶...
以熔体纺丝方法制备了碳黑/聚酯(CB/PET)导电纤维, 分析了偶联剂对CB/PET纤维渗流阈值和Tg的影响, 研究了碳黑含量与CB/PET纤维热性能和导电性能的关系。结果表明碳黑经偶联剂处理后, CB/PET纤维的渗流阈值和Tg均有所降低; 碳黑含量对CB/PET纤维的性能影响显著, 即随碳黑含量增加, CB/PET纤维的正效温度系数效应向高温移动; 当碳黑含量为11%时, CB/PET纤维表现...
通过溶胶--凝胶法制备了二氧化硅(SiO2)溶胶, 并以含氢硅油(PMHS)为改性剂, 对SiO2粒子表面进行疏水化处理, 然后在玻璃基片上提拉成膜和加热凝胶化, 制备出超疏水PMHS--SiO2涂膜。通过接触角测定、红外光谱、透射电镜、扫描电镜、湿热老化等手段对涂膜的制备条件、结构与性能进行了研究。结果表明, 在PMHS/SiO2质量比为1 : 1、改性时间为4 h、涂膜热处理温度170℃、热处...
Anaerobic digestion of maize hybrids for methane production
Anaerobic digestion maize hybrids methane production
2010/8/12
The world in the 21st century is faces problems due to growing energy consumption and diminishing supplies of fossil fuels, which has led to researches at the use of renewable energy sources and, cons...
Studying of polyoxadiazole with Si atom in the backbone
UV-Vis spectroscopy AFM microscopy IR spectroscopy Spin-coating method Organic polymer
2010/8/17
An application of organic polymers as thin films in optoelectronic devices is wide enough. The most common in this area are semiconducting polymers as polyparaphenylenevinylene (PPV) [1] and polyparap...
Hard coal modified with silanes as polyamide filler
modified with silanes polyamide filler
2010/8/12
In the recent years, higher and higher requirements concerning structural materials have focused our studies on developing new materials and especially on modification of the existing ones. Polymer st...
Artificial extracellular matrix for embryonic stem cell cultures: a new frontier of nanobiomaterials
Artificial extracellular matrix embryonic stem cell cultures frontier of nanobiomaterials
2010/10/12
Nanobiomaterials can play a central role in regenerative medicine and tissue engineering by facilitating cellular behavior and function, such as those where extracellular matrices (ECMs) direct embryo...
Biopolymeric nanoparticles
Biopolymeric nanoparticles
2010/10/12
This review on nanoparticles highlights the various biopolymers (proteins and polysaccharides) which have recently revolutionized the world of biocompatible and degradable natural biological materials...
Efficiency of two non-destructive testing methods to detect defects in polymeric materials
Efficiency testing methods detect polymeric materials
2010/8/12
There are many different non-destructive testing techniques which can be applied to polymer materials, but so far, ultrasounds has occupied one of the leading places [1-4]. Nowadays, also utilization ...
Fractographic study of high-density polyethylene gas pipe following Small Scale Steady State test
Fractographic high-density polyethylene gas pipe Small Scale Steady State test
2010/8/12
Polyethylene (PE) is the primary material used for gas pipe applications. Because of its flexibility, ease of joining and long-term durability, along with lower installed cost and lack of corrosion, g...
Purpose: The purpose of this paper was to present the results of a special abrasion test of poly(vinyl chloride) and polypropylene filled with calcium carbonate pipes. Abrasion test’s results for pipe...
Electrical properties of polymeric gradient materials based on epoxy resin filled with hard coal
Electrical properties polymeric gradient materials epoxy resin hard coal
2010/8/11
Functionally Gradient Materials (FGMs) are not a quite new group of materials because these materials were known since many years and for the first time they were described in scientific
literature i...
Performance properties and structure of electrochemically aged polypropylene with a dye addition
Engineering polymers Mechanical properties Thermal properties
2010/8/16
Properties of polymeric materials depend on structural factors of polymer as well as on conditions of exploitation. The structural factors are for example: molecular weight, chemical structure of macr...