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1.
采用在位分散聚合法制备了纳米CeO2 /PMMA杂化材料.XRD分析表明,杂化材料是无定形的.SEM分析表明,杂化材料中CeO2 含量不同,材料的断面形貌明显不同,随CeO2 含量的增加,杂化材料由韧性断裂向脆性断裂转变.EDS面分析表明,Ce在杂化材料中分布均匀.实验表明,随CeO2 含量的增加,杂化材料的透过率和溶解性降低  相似文献   

2.
纳米CeO2/PMMA杂化材料的制备与表征   总被引:16,自引:0,他引:16  
采用在位分散聚合法制备了纳米CeO2/PMMA杂化材料。XRD分析表明,杂化材料 是无定形的。SEM分析表明,杂化材料中CeO2含量不同,材料的断面形貌明显不同 ,随CeO2含量的增加,杂化材料由韧性断裂向脆性断裂转变。EDS面分析表明,Ce 在杂化材料中分布均匀。实验表明,随CeO2含量的增加,杂化材料的透过率与溶解 性降低。  相似文献   

3.
纳米CeO2/聚苯乙烯杂化材料的制备及表征   总被引:12,自引:0,他引:12  
用反相胶束微乳液法制备了纳米CeO2/聚苯乙烯杂化材料 .XRD分析表明,纳米CeO2/聚苯乙烯杂化材料中,CeO2是无定形粒子.XPS分析表明,杂化材料并非简单的物理混合,CeO2纳米粒子与有机物之间存在着一定强度的化学键.FTIR分析表明,CeO2粒子的吸收存在蓝移现象.  相似文献   

4.
通过三异丙氧基钕直接掺入MMA单体 ,迅速形成凝胶后进行原位聚合的方法制得三异丙氧基钕 /PMMA杂化材料 ,采用IR、TG、WAXD、DMTA、SEM等手段对其进行表征 .结果表明 ,三异丙氧基钕与MMA中的羰基因配位并导致交联形成了交联网状结构的杂化材料 .与PMMA相比 ,这种杂化材料具有优良的耐热性、耐溶剂性 ,高贮能模量 ,同时 ,该制备方法克服了稀土离子易缔合的缺点 ,获得了高稀土含量且均匀分布的三异丙氧基钕 /PMMA杂化材料  相似文献   

5.
纳米CeO_2/聚苯乙烯杂化材料的制备及表征   总被引:3,自引:0,他引:3  
用反相胶束微乳液法制备了纳米CeO2/聚苯乙烯杂化材料.XRD分析表明,纳米CeO2/聚苯乙烯杂化材料中,CeO2是无定形粒子.XPS分析表明,杂化材料并非简单的物理混合,CeO2纳米粒子与有机物之间存在着一定强度的化学键.FTIR分析表明,CeO2粒子的吸收存在蓝移现象.  相似文献   

6.
脉冲激光法制备修饰纳米Eu_2O_3/聚苯胺导电杂化薄膜   总被引:1,自引:0,他引:1  
采用聚焦脉冲激光法(PLA-IT/SFL)制备修饰纳米Eu2O3/聚苯胺有机溶胶及其杂化薄膜材料。考察了制备条件对修饰纳米Eu2O3/聚苯胺有机溶胶荧光性能的影响。TEM显示Eu2O3粒子粒径约为15 nm且其在聚苯胺中有较高的稳定性。荧光光谱表明该杂化薄膜材料在紫外光照射下发出强烈的红光,且荧光强度达2.53×105a.u。杂化薄膜材料的电导率为1.13×10-2S.cm-1。热分析表明该杂化薄膜比导电性聚苯胺(PAN-HCSA)薄膜具有更好的热稳定性。该杂化薄膜材料可望用于电致发光领域。  相似文献   

7.
PMMA/SiO2透明块体材料的热性能分析与微观结构表征   总被引:1,自引:0,他引:1  
毕于铁  任洪波  张林  王鲜  尚承伟 《应用化学》2009,26(10):1244-1246
以正硅酸乙酯为前驱体,采用无溶剂水解技术,制备出了均一、稳定、透明的二氧化硅溶胶,通过透射电镜分析,粒径在100nm左右;在溶胶中加入甲基丙烯酸甲酯(MMA)和偶氮二异丁腈(AIBN),采用热固化的方式制备出透明的块体PMMA/SiO2杂化材料,通过差热分析、热重和透射电镜表征杂化材料的热性能和微观结构,实验结果表明:当体系中的SiO2含量超过20%时,杂化材料无明显的玻璃化转变温度;无机相均匀分散在有机相中,两相之间没有明显的相分离现象,制备出均一的杂化材料。  相似文献   

8.
由共聚合在PMMA聚合物链段上引入了-Si(OR)3功能团,通过溶胶-凝胶过程合成了PMMA/TiO2杂化聚合物材料.溶剂抽提结果表明有化学键存在的杂化材料体系中凝胶的含量很高.通过FTIR测试对材料结构进行了分析,由TGA、DSC测试分析了杂化材料体系中无机组份的含量对材料性能的影响.  相似文献   

9.
采用浸渍法制备了表面AgX(X=I,Br)等离子基元修饰的ZnO纳米柱状阵列,研究了浸渍浓度和时间以及紫外光光照预处理对ZnO纳米柱状阵列可见光光催化活性的影响.采用场发射扫描电子显微镜、X射线衍射仪、紫外可见漫反射吸收光谱以及X射线光电子能谱仪等手段对ZnO纳米柱状阵列的形貌、相组成、禁带宽度及其表面特性进行了表征.结果显示,AgBr颗粒分布于ZnO纳米柱状阵列的顶端及顶端侧面,同时AgBr颗粒之间相互接触而形成网状结构.通过紫外光光照预处理,AgBr表面出现细小颗粒,形成Ag/AgBr/ZnO纳米复合结构.可见光光催化降解甲基橙结果表明,在相同工艺条件下所制AgBr/ZnO的可见光光催化活性明显优于AgI/ZnO,且与浸渍浓度及时间有关.由于ZnO纳米柱状阵列的比表面积大,AgBr的可见光响应特性以及Ag/AgBr纳米结构的表面等离子效应,经过紫外光光照预处理形成的Ag/AgBr/ZnO纳米复合结构表现出最好的可见光光催化活性.  相似文献   

10.
合成了3种新型螺噁嗪类化合物(SP1~SP3),其分子结构中分别带有不同碳链长度的同类型取代基—(CH2)nBr;利用其活性基团C-Br与部分水解的聚甲基丙烯酸甲酯(h PMMA)反应制备了含SP1~SP3官能基的PMMA光致变色功能高分子材料(SP1~SP3-h PMMA).采用1H-NMR和IR对SP1~SP3结构进行了表征.研究了SP1~SP3及SP1~SP3-h PMMA的光致变色性能及其影响因素;研究了酸的加入和PMMA的水解率对SP1~SP3-h PMMA光致变色性能及热稳定性的影响.研究结果表明,与SP1、SP2比较,含最长碳链的SP3表现出优良的光敏感性和热稳定性;SP1~SP3-h PMMA的热稳定性均明显高于相应的SP1~SP3;盐酸的加入有利于提高SP-h PMMA的热稳定性;以水解率为9%的PMMA制备的SP3-9%h PMMA具有优异的光致变色性能和热稳定性.  相似文献   

11.
Poly(methylmethacrylate) (PMMA) shows high strength and transparency but is a flammable material. In this study, the surface of aluminum hydroxide was modified with methacrylate containing phosphoric acid moieties before dispersion in MMA, and organic-inorganic nano-hybrid materials were obtained by bulk polymerization in the presence of the surface-modified aluminum hydroxide. The resulting hybrid materials retained the high transparency of PMMA, with transparency values similar to that of pure PMMA. Moreover, the flame resistance of the hybrid materials was improved in comparison with that of pure PMMA, with depression of the horizontal burning rate becoming a maximum at an inorganic content of 3 wt%. These results suggest that the use of aluminum hydroxide surface-modified with phosphoric acid groups is an efficient method for obtaining good performance fire-resistant polymer materials.  相似文献   

12.
In this article, the poly(methyl methacrylate)/montmorillonite (PMMA/MMT) organic-inorganic hybrid materials were prepared by conventional free radical polymerization and reversible addition-fragmentation chain transfer (RAFT) polymerization, respectively. The kinetics comparison of these two polymerizations was studied. The PMMA/MMT hybrid materials were characterized by gel permeation chromatography (GPC), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). According to these results, we knew that the polymerization behavior of MMA showed controlled/living radical polymerization (CLRP) characteristics under the control of RAFT agent. The incorporation of RAFT agent and MMT nanoparticles improved the thermal properties of polymers, and the thermal stability of polymers increased with increasing content of MMT nanoparticles. The structures and morphologies of PMMA/MMT hybrid materials were characterized by FT-IR, XRD and TEM. These results showed that the MMA monomer can be initiated and propagated in the clay layers of MMT via the control of RAFT agent, and then the exfoliated structure was obtained for the hybrid materials.  相似文献   

13.
以乙烯基三氯硅烷为原料水解制得八乙烯基多面体低聚倍半硅氧烷(OV-POSS),将其与经KH570改性的SiO2溶胶和甲基丙烯酸甲酯(MMA)混合均匀,采用热固化的方法制得PMMA/SiO2/OV-POSS杂化材料,通过透射电镜、红外谱图、差热分析和热重分析对材料的微观结构以及热性能进行表征,结果表明:杂化材料结构均匀,有机相和无机相之间通过双键聚合的方式形成了共价键;杂化材料耐热性好,玻璃化转变温度比纯PMMA提高约72℃,分解温度提高约121℃。  相似文献   

14.
Hybrid materials doped with novel europium complexes were synthesized using PMMA‐co‐Sn12Clusters (copolymers from oxohydroxo‐organotin dimethacrylate and methylmethacrylate) as the matrix material. Two types of hybrid materials were obtained: the physically doped product, PMMA‐co‐Sn12Cluster/Eu(TTA)3phen, and the grafted product, PMMA‐co‐Sn12Cluster‐co‐[EuAA(TTA)2phen] (TTA=2‐thenoyltrifluoroacetone, phen=phenanthroline and AA=acrylic acid). The hybrid materials exhibited characteristic luminescence of the Eu3+ ions, and also showed relative especial optical properties compared with samples just using PMMA as the matrix material. The PMMA‐co‐Sn12Cluster matrix exhibited a high physical doping quantity of [Eu(TTA)3phen], which can be attributed to the special structure of this kind of hybrid material. GPC (gel‐permeation chromatography), TGA (thermogravimetric analysis), SEM, 1H NMR, ICP (inductively coupled plasma), 119Sn NMR, FTIR, and diffuse reflectance techniques were employed to characterize the structures and properties of these hybrid materials.  相似文献   

15.
A plasmonic Ag/AgBr nanohybrid has been synthesized by in situ thermal reduction of AgBr nanoparticles in polyols. This directly converted Ag/AgBr shows significant absorption over the full visible spectrum. The enhanced light absorption in the spectral region of 450 nm to 800 nm was due to the plasmonic nanosized Ag grown on the surface of AgBr nanoparticles with mixed morphologies and increased sizes. Under visible light irradiation, the plasmonic Ag/AgBr exhibits high activity and stability for the photodegradation of organic pollutants, e.g. methylene blue. The contribution of the SPR and its synergistic effect with the photosensitive AgBr in the photocatalytic activity were verified. Based on the plasmon-mediated charge injection and the band structure of the metal-semiconductor heterojunction, a mechanism of the plasmon synergistically enhanced photocatalytic process was proposed.  相似文献   

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