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1.
在外部电容耦合的辉光放电装置中进行了三乙氧基乙基硅烷、三乙氧基乙烯基硅烷和三甲基乙烯基硅烷的聚合。研究了体系压力、放电功率、等离子气体(N_2、Ar)及基片距离对淀积速率的影响,重点讨论了取代基的影响。并用元素分析、红外光谱和热重分析等方法研究了聚合物的结构与性能。  相似文献   

2.
乙烯基三氯硅烷的醇解研究   总被引:1,自引:0,他引:1  
研究了乙烯基三氯硅烷的醇解反应,合成了乙烯基三甲氧基硅烷和乙烯基三乙氧基硅烷,考察了不同溶剂、温度、N2流速、原料配比、投料方式等对产物收率的影响,确定了最佳反应条件.  相似文献   

3.
以乙烯基三氯硅烷和三氟乙醇为原料,二氯甲烷为溶剂合成了乙烯基三(2,2,2-三氟)乙氧基硅烷。考察了原料配比、溶剂用量、Ar2流量、三氟乙醇滴加速度、温度、反应时间等因素对产物收率的影响,确定了最佳合成条件。并运用FT-IR、1 H-NMR、13 CNMR对产物结构进行了表征。  相似文献   

4.
Al2O3—SiO2—TiO2薄膜的表面改性——偶联剂反应   总被引:4,自引:0,他引:4  
用乙烯基三乙氧基硅烷对Al2O3-SiO2-TiO2陶瓷薄膜作表面改性。乙烯基三乙氧基硅烷通过乙氧基与薄膜表面的羟基反应而结合于薄膜表面。表面基团含量随处理时间延长而线性增加,提高温度和有机物浓度都使表面基团的含量提高。偶联剂在复合薄膜表面枝接后以单体形式存在,互不交联。  相似文献   

5.
李红姬  张万喜  迟剑锋  梁波  陈广义 《功能材料》2006,37(2):295-297,300
详细研究了乙烯-醋酸乙烯酯共聚物(EVA)和纳米氧化钛(nano-TiO2)复合体系的制备工艺对力学性能、分散状态的影响.研究表明,如果把乙烯基三乙氧基硅烷(硅烷偶联剂)作为一个组分,直接与基体EVA及分散相纳米TiO2进行混合,更有利于纳米粒子在基体中的分散.在该复合体系中,纳米TiO2与乙烯基三乙氧基硅烷达到了协同增韧EVA的目的,同时,纳米TiO2具有补强作用,当复合体系的组成为EVA/纳米TiO2=95:5时,对EVA的改性效果最佳.  相似文献   

6.
不饱和硅烷熔融挤出接枝聚乙烯的研究   总被引:6,自引:0,他引:6  
采用熔融挤出法对低密度聚乙烯进行硅烷接枝,然后在催化剂二月桂酸二丁基锡存在进行水解交联,对接枝产物的熔体流动速率和交联样品的凝胶率的影响因素进行了系统的研究,接枝单体为乙烯基三乙氧基硅烷,主要引发剂为过氧化二异丙苯。  相似文献   

7.
以乙烯基三(2,2,2-三氟)乙氧基硅烷为单体,偶氮二异丁腈为引发剂,乙腈为溶剂,通过溶液聚合法合成了聚乙烯基三(2,2,2-三氟)乙氧基硅烷。考察了溶剂用量、引发剂用量、温度、反应时间等因素对产物收率的影响,确定了最佳合成条件。并运用FT-IR、1 H-NMR、GPC对产物进行了表征,同时对合成聚合物疏水性能进行了研究。结果表明:在投料质量配合比为乙烯基三(2,2,2-三氟)乙氧基硅烷∶乙腈∶偶氮二异丁腈=1∶2.8∶0.005,反应温度70℃、反应时间9h,产品收率达91.3%,数均分子量为2.3×104。用制得的聚合物修饰经化学刻蚀的铝合金片的水滴接触角为155°,滚动角2°,具有优异超疏水性能。  相似文献   

8.
采用乳液聚合法,通过乙烯基三乙氧基硅烷(KH151)共聚修饰,制备系列有机/无机杂化聚苯乙烯复合微球。使用激光散射和TEM分别对微球的粒径分布和形貌进行表征,并研究了合成工艺条件对有机/无机杂化修饰微球的颗粒分散性及形貌的影响。结果表明,通过控制乙烯基三乙氧基硅烷(KH151)共聚修饰剂的加入过程,可制得粒径分散均一、表面光滑的杂化修饰微球。使用FT-IR、NRM、TGA和DSC对微球的结构和性能进行表征,显示微球表面富含羟基功能基团,热稳定性较好,并分析了有机/无机杂化修饰苯乙烯微球的形成和热稳定性增强的机理。  相似文献   

9.
采用水解-缩聚法,以苯基三乙氧基硅烷、二苯基二甲氧基硅烷为原料,以乙烯基双封头(VV)为封端剂,以盐酸为催化剂,合成了具有高折射率的苯基乙烯基硅树脂,利用FT-IR、核磁共振、热重分析等对产物进行表征。研究了苯基含量对产物折射率的影响,将制得的苯基乙烯基硅树脂与苯基含氢硅树脂按一定比例硫化成型,制得适用于LED封装的有机硅树脂。研究结果表明:苯基用量为40.5%(摩尔百分数)时,制得的苯基乙烯基硅树脂的折射率为1.5370,热稳定性良好,固化后产物的性能最佳,透光率大于90%,符合LED封装要求。  相似文献   

10.
采用阴离子聚合反应合成了可作为纤维增强聚合物复合材料界面改性偶联剂的苯乙烯/丁二烯/乙烯基三乙氧基硅烷及苯乙烯/异戊二烯/乙烯基三乙氧基硅烷嵌段共聚物,通过傅立叶红外光谱(FT-IR)、核磁共振氢谱(1H-NM R)等分析手段对合成产物进行了表征,并采用透射电镜(TEM)、动态激光光散射(DLLS)等技术研究了嵌段共聚物在溶剂中的组装行为。结果表明,反应合成了预定结构的嵌段共聚物偶联剂,该共聚物在选择性溶剂中能形成以可溶性链段为壳、难溶性链段为核的胶束结构,胶束的粒径与共聚物分子链及各嵌段的长度有关。  相似文献   

11.
直接挥发法制备无纺布增强型聚合物电解质   总被引:2,自引:0,他引:2  
胡拥军  陈白珍  袁艳  李义兵 《功能材料》2006,37(9):1401-1403,1407
以N,N-二甲基-甲酰胺(DMF)为溶剂, 采用直接挥发法制备无纺布增强型聚偏氟乙烯-六氟丙烯(PVDF-HFP)聚合物电解质, 并以锂为负极制备了聚合物电池.用扫描电子显微镜、交流阻抗和循环伏安对所制聚合物膜性能进行了表征,用充放电实验对所制聚合物电池电化学性能进行了测试.实验结果表明,直接挥发法制得的聚合物膜孔穴丰富,微孔呈蜂窝状,吸液率为280%,电化学稳定窗口为4.5V,浸取电解液后室温离子电导率为1.5mS/cm;以LiCoO2为正极制得的聚合物电池0.1C充放电, 放电平台为3.9V左右, 首次放电容量为137.5mAh/g,20次循环后容量保持在134mAh/g以上,充放电库仑效率高于95%,0.5C放电时放电平台为3.7V,0.5和1C放电分别能保持0.1C放电容量的96%和93%.  相似文献   

12.
A study of the durability of corona discharge plasma effects on a polymer surface was investigated in this work. We used the corona discharge plasma technique to modify the wettability properties of low density polyethylene (LDPE) film and evaluated the influence of relative humidity and temperature on the aging process with three different storage conditions. The effects of the aging process on the plasma-treated surface of LDPE film were quantified by contact angle measurements, Fourier-transformed infrared spectroscopy, and X-ray photoelectron spectroscopy. The results obtained with these techniques have allowed us to determine how the aging process promotes changes in the plasma-treated surface by decreasing its wettability and taking place a remarkable hydrophobic recovery process.  相似文献   

13.
报道了含氮化合物如吡咯(Pyr)、吡啶(Pd)、四氢吡咯(Pyd)和六氢吡啶(Ppd)等离子(Plasma)聚合研究结果,它们具有相对不同的聚合行为。同时不研究了催化剂I2对Plasma聚合的加速作用,可使吡咯Plasma聚合速率提高40%-60%。  相似文献   

14.
Investigation of deposition rate and structure of pulse DC plasma polymers   总被引:5,自引:0,他引:5  
In this study, hydrophobic plasma polymer films were prepared from perfluorohexane with saturated linear structure and octafluorotoluene with a cyclic unsaturated structure. Hydrophilic plasma polymer film was prepared from acrylic acid with an unsaturated linear structure. The film deposition rates were compared through in-situ laser interferometer measurement and correlated them with the precursor structure and the deposition parameters. The chemical structure and the surface energy of the films were also investigated with FTIR and contact angle measurement. The results showed that the deposition rate increased with the discharge power. Otherwise, the deposition rate relied on the structure of the precursors to a large extent. The deposition rate of octafluorotoluene is 7 times the deposition rate of perfluorohexane and 5 times the deposition rate of acrylic acid at the same deposition parameters. So a high deposition rate could be obtained for the precursors with cyclic and unsaturated structures. For the pulse discharge of acrylic acid, there existed a maximum deposition rate for a certain pulse frequency. But it was found that the pulse frequency had greater effects on the structure of the plasma films than on the deposition rate. As the pulse frequency decreased, more CHO and O---C=O groups were found in the deposited film of acrylic acid. And the pulse discharge at low power could keep more aromatic ring in octafluorotoluene plasma film than continuous discharge at high power. This explained the phenomenon that the surface energy of octafluorotoluene plasma film deposited by the low power pulse discharge was lower than that of the film deposited by the high power continuous discharge and showed to be more hydrophobic.  相似文献   

15.
Plasma-polymerized thin films based on two benzonitrile derivatives, aminobenzonitrile (ABN) and nitrobenzonitrile (NBN), were prepared by r.f. glow discharge techniques. Fourier transform infrared (FTIR) and UV-Visible absorption spectra revealed that extensively conjugated C N double bonds have been formed during plasma polymerization in both derivatives. The films formed are transparent and dark brown in color. Morphological study using a field emission microscope (FEM) indicated that fine and homogeneous films could be obtained at comparatively low discharge powers. The femtosecond time-resolved optical Kerr effect was used to measure the third-order optical nonlinearity. A unique ultrafast response and non-resonant optical Kerr effect of two polybenzonitrile derivative films were observed. Furthermore, the effects of polymer molecular structures on the non-linear optical properties were also tentatively discussed.  相似文献   

16.
After-glow discharge plasma polymerization was developed for alkaline anion-exchange membranes synthesis using vinylbenzyl chloride as monomer. X-ray photoelectron spectroscopy and attenuated total reflection Fourier transform infrared spectroscopy were used to characterize the chemical structure properties of plasma-polymerized membranes. Ion-exchange capacities of quaternized poly(vinylbenzyl chloride) (QPVBC) membranes were measured to evaluate their capability of hydroxyl ion transport. A mechanism of plasma polymerization using VBC as monomer that accounts for the competitive effects of free radicals polymerization and plasma ablation in the plasma polymerization process was proposed. Our results indicate that plasma discharge power influences the contents of functional groups and the structure of the plasma polymer membranes, which attribute to the coactions of polymerization and ablation. The properties of uniform morphology, good adhesion to the substrate, high thermal stability and satisfying anion conduction level suggest the potential application of QPVBC membrane deposited at discharge power of 20 W in alkaline direct methanol fuel cells.  相似文献   

17.
采用界面聚合法,以大分子掺杂酸樟脑磺酸为掺杂剂,合成了苯胺/邻甲苯胺共聚物。利用红外光谱(FT-IR)和紫外光谱(UV-vis),对该共聚物成分和结构进行了表征。通过循环伏安和恒流充放电技术考察了该共聚物的电化学电容行为。结果表明,制备的活性电极材料樟脑磺酸掺杂苯胺/邻甲苯胺共聚物在1mol/LH2SO4溶液中呈现一定的电化学电容行为。随着扫速从3mV/s增大到10mV/s,峰电流从5mA增大11mA,表明该聚合物具有较快的电流响应。在电流密度为1.5mA/cm2时,单电极比电容达到275F/g,表明该材料在电化学电容器中有一定的应用前景。  相似文献   

18.
Yves Martin 《Thin solid films》2007,515(17):6844-6852
Plasma polymerization processes are widely used to chemically functionalize surfaces, which properties can be tuned by different operating variables. In this study, thin amine-containing polymer layers were produced on solid substrates in a custom-made cylindrical plasma polymerization reactor by radio frequency glow discharges of n-heptylamine vapours. Carefully planned experiments were conducted to evaluate the importance of four different process parameters on the chemical composition and thickness of the resulting films. The parameters investigated were: 1) deposition time, 2) power of the glow discharge, 3) distance between the electrodes, and 4) monomer pressure. Possible interactions between these variables were investigated through the use of statistical analyses (i.e., factorial design). This study reveals that n-heptylamine plasma polymer (HApp) layer thickness is influenced by the power of the glow discharge and the deposition time, as assessed by surface plasmon resonance and atomic force microscopy step height measurements. Also, the atomic ratio of nitrogen to carbon atoms on the treated surfaces is mainly influenced by the power of the glow discharge, as revealed by X-ray photoelectron spectroscopy. Quartz crystal microbalance analysis also confirmed that HApp layers are stable when immersed in aqueous solution.  相似文献   

19.
以聚偏氟乙烯-六氟丙烯(Poly(vinylidene fluoride-hexafluoropropylene),PVDF-HFP)为聚合物基体,新戊二醇二丙烯酸酯(Neopentyl glycol diacrylate,NPGDA)为交联剂,在引发剂偶氮二异丁腈(2,2′-Azobis(2-methylpropionitrile),AIBN)的作用下通过室温现场聚合法制备凝胶电解质用于锂离子电池。探索不同质量比PVDF-HFP/NPGDA对凝胶电解质性能和LiNi_(0.5)-Co_(0.2)Mn_(0.3)O_2三元正极锂离子电池性能的影响。结果表明,当质量比为1∶1时,凝胶电解质具有较高的离子电导率,为8.45mS·cm~(-1),锂离子迁移数为0.78,电化学窗口为4.5V。在电流密度30mA·g~(-1)恒流充放电,首次放电比容量为143mAh·g~(-1),循环50次后仍高达135.3mAh·g~(-1)。电流密度为300mA·g~(-1)时,放电比容量为100.2mAh·g~(-1)。  相似文献   

20.
添加无机粒子的P(VDF-HFP)-PMMA复合聚合物电解质的性能   总被引:1,自引:0,他引:1  
研究了以PP/PE/PP(聚丙烯/聚乙烯/聚丙烯)膜为支撑体,P(VDF-HFP)(聚(偏二氟乙烯-六氟丙烯))-PMMA(聚甲基丙烯酸甲酯)为聚合物基体,与纳米级SiO2、CaCO3进行复合构成的聚合物电解质膜(CPE)的性能。借助X射线衍射、电化学阻抗、电池的首次充放电、倍率放电和充放电循环测试,考察了复合聚合物电解质CPE(SiO2)和CPE(CaCO3)的结构以及它们与LiFePO4正极材料、金属锂的相容性。结果表明:无机粒子的加入没有改变原来聚合物P(VDF-HFP)-PMMA非晶结构;两种电解质构成的电池的首次充放电性能相差不大,但是循环性能后者优于前者;LiFePO4/CPE(CaCO3)/Li构成的电池的倍率放电性能、放电容量和容量保持率均优于LiFePO4/CPE(SiO2)/Li电池;CPE(CaCO3)与LiFePO4、金属锂的相容性更好。  相似文献   

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