共查询到20条相似文献,搜索用时 156 毫秒
1.
溶胶-凝胶法制备环氧树脂/SiO2杂化材料,利用FTIR、SEM和综合热分析仪对杂化材料的结构、显微形态及热性能进行了表征.结果表明,杂化材料中SiO2与环氧树脂两相间存在氢键作用;SiO2质量分数<7%时SiO2与环氧树脂之间无明显相界面,可获得有机聚合物链段与无机网络互穿的有机/无机杂化材料;SiO2质量分数为11%时材料具有最佳耐热性能. 相似文献
2.
3.
4.
采用溶胶-凝胶法,以正硅酸乙酯为前驱物,甲基丙烯酸-β羟乙酯为交联剂,制备了透明均质的PMMA-PPMOE/SiO2有机无机杂化材料,通过FT-IR、XRD、DSC-TG和偏光显微镜等研究了材料的结构和性能,结果表明,杂化材料中存在Si-O-C共价键,形成了有机无机杂化网络,从而使材料的耐热性优于PMMA-PPMOE有机聚合物。 相似文献
5.
6.
以聚乙烯醇(PVA)与聚乙二醇(PEG)共混,并以正硅酸乙(酯TEOS)和钛酸四丁酯(TBT)为无机前驱体,采用溶胶-凝胶法制备了不同(SiO_2-TiO_2)含量的PVA-PEG/SiO_2-TiO_2杂化溶胶,陈化后用提拉法制得杂化纤维.研究了杂化溶胶的可纺性,并使用IR、光学显微镜、UV-Vis和TG对杂化纤维的结构与性能进行了研究.结果表明:随硅钛摩尔比的增加或随有机相中PEG/PVA质量比的增加,溶胶的可纺性变好;有机相与无机相之间通过化学键连接;纤维直径为50μm左右;TiO_2的引入增加了其抗紫外性,杂化纤维的耐热性优于纯PVA-PEG. 相似文献
7.
8.
9.
10.
11.
本文介绍了溶胶-凝胶法的基本过程,对无机/有机杂化材料进行了分类,描述了溶胶-凝胶法制备无机有机杂化材料的常用方法,对杂化材料进行了评述,并预测了将来的发展趋势。 相似文献
12.
Flexible Hard Coating: Glass‐Like Wear Resistant,Yet Plastic‐Like Compliant,Transparent Protective Coating for Foldable Displays 下载免费PDF全文
Gwang‐Mun Choi Jungho Jin Dahye Shin Yun Hyeok Kim Ji‐Hoon Ko Hyeon‐Gyun Im Junho Jang Dongchan Jang Byeong‐Soo Bae 《Advanced materials (Deerfield Beach, Fla.)》2017,29(19)
A flexible hard coating for foldable displays is realized by the highly cross‐linked siloxane hybrid using structure–property relationships in organic–inorganic hybridization. Glass‐like wear resistance, plastic‐like flexibility, and highly elastic resilience are demonstrated together with outstanding optical transparency. It provides a framework for the application of siloxane hybrids in protective hard coatings with high scratch resistance and flexibility for foldable displays. 相似文献
13.
原位聚合法制备尼龙6复合材料的研究进展 总被引:2,自引:0,他引:2
综述了近年来国内外尼龙6原位复合材料的研究进展.基于改性剂的不同,将其分为无机纳米粒子/尼龙6原位复合材料、有机高分子聚合物/尼龙6原位复合材料和碳纳米管/尼龙6原位复合材料.重点介绍了这三类复合材料的力学性能和耐热性能. 相似文献
14.
Martin RA Yue S Hanna JV Lee PD Newport RJ Smith ME Jones JR 《Philosophical transactions. Series A, Mathematical, physical, and engineering sciences》2012,370(1963):1422-1443
Bone is the second most widely transplanted tissue after blood. Synthetic alternatives are needed that can reduce the need for transplants and regenerate bone by acting as active temporary templates for bone growth. Bioactive glasses are one of the most promising bone replacement/regeneration materials because they bond to existing bone, are degradable and stimulate new bone growth by the action of their dissolution products on cells. Sol-gel-derived bioactive glasses can be foamed to produce interconnected macropores suitable for tissue ingrowth, particularly cell migration and vascularization and cell penetration. The scaffolds fulfil many of the criteria of an ideal synthetic bone graft, but are not suitable for all bone defect sites because they are brittle. One strategy for improving toughness of the scaffolds without losing their other beneficial properties is to synthesize inorganic/organic hybrids. These hybrids have polymers introduced into the sol-gel process so that the organic and inorganic components interact at the molecular level, providing control over mechanical properties and degradation rates. However, a full understanding of how each feature or property of the glass and hybrid scaffolds affects cellular response is needed to optimize the materials and ensure long-term success and clinical products. This review focuses on the techniques that have been developed for characterizing the hierarchical structures of sol-gel glasses and hybrids, from atomic-scale amorphous networks, through the covalent bonding between components in hybrids and nanoporosity, to quantifying open macroporous networks of the scaffolds. Methods for non-destructive in situ monitoring of degradation and bioactivity mechanisms of the materials are also included. 相似文献
15.
C. Yang Y. H. Tang W. M. Lam W. W. Lu P. Gao C. B. Zhao M. M. F. Yuen 《Journal of Materials Science》2010,45(13):3588-3594
We report the synthesis and characterization of a kind of silane-terminated poly(ether–urethane) (PEU)-titania elastomeric
hybrid for UV and X-ray shielding application. The hybrids can be easily synthesized by a moisture-cured sol–gel process at
room temperature. Strong interactions between the organic and inorganic domains in these hybrids are obtained through the
hydrolysis–condensation of the silane end group of the prepolymer with titanium isopropoxide (TTIP), which forms a 3D hybrid
network. These hybrids exhibit adjustable mechanical properties, in a range dependent on the organic/inorganic content ratio,
e.g., the hybrid containing 40 wt% of TTIP exhibits 69.3% elongation at break and excellent resilience. They show intrinsic
optical transparency and the ability to completely block UV radiation in the range of UV-B and UV-A2, as well as excellent
X-ray radiation blocking property. This study opens the possibility for using elastomeric coating and sealant in advanced
personal protection equipments for shielding radiations. 相似文献
16.
Sonia Zulfiqar Zahoor Ahmad Muhammad Ishaq Shaukat Saeed Muhammad Ilyas Sarwar 《Journal of Materials Science》2007,42(1):93-100
Organic-inorganic hybrids based on a triblock copolymer [polystyrene-b-poly (ethylene-ran-butylene)-b-polystyrene-g-maleic
anhydride] (SEBS-g-MA) with silica and clay were prepared using sol-gel and solution intercalation methods respectively. Reinforcement
in the first system was achieved by the in-situ hydrolysis/condensation of tetraethoxysilane in the copolymer matrix yielding
hybrid materials. The interaction between organic and inorganic phases was developed through a coupling agent. In another
system, copolymer was reinforced by organoclay and compatibility between copolymer and hydrophilic montmorillonite was achieved
by intercalation of clay with dodecylamine which increased the organophilicity of the clay. Thin transparent films of these
hybrids materials were characterized for their mechanical, thermal and thermomechanical behavior. The tensile strength of
hybrids improved relative to the pure copolymer in all the systems. Dynamic mechanical thermal analysis carried out gave α-relaxation
temperature associated with glass transition temperature (Tg). The results indicate a shift in Tg values with the addition of silica in the matrix, which suggests an increased interfacial interaction between organic and
inorganic phases while this effect is less pronounced in polymer–clay system. Thermal decomposition temperatures of the hybrids
were found in the range of 450–500 °C. The weights of the residues left at 700 °C were nearly proportional to the inorganic
contents in the original hybrids. 相似文献
17.
18.
采用端硅氧烷基聚己内酯( PCL-TESi) 作为无机前躯物, 通过环氧树脂/ KB-2 的固化反应和PCL-TESi的溶胶2凝胶过程, 制备了聚己内酯/ 环氧树脂/ SiO2 ( PCL/ EP/ SiO2 ) 有机-无机杂化材料。利用红外光谱、透射电镜( TEM) 、热失重分析( TGA) 及在甲苯溶液中的溶胀试验对不同SiO2 含量的杂化材料进行分析。研究发现, 随着PCL-TESi 含量增大杂化体系交联密度降低; 此杂化体系中存在环氧和Si —O —Si 两种交联网络, 微观上形成纳米两相结构; Si —O —Si 交联网络的形成显著提高了材料的耐热性能, 使失重5 %时的热分解温度从120.5 ℃(纯环氧树脂/ KB-2 体系) 提高到277.6 ℃(SiO2质量分数为3. 84 %的杂化体系) 。 相似文献
19.
P. Gomez‐Romero 《Advanced materials (Deerfield Beach, Fla.)》2001,13(3):163-174
This review surveys the work developed in the field of functional hybrid materials, especially those containing conducting organic polymers (COPs), in combination with a variety of inorganic species, from molecular to extended phases, including clusters and nano‐sized inorganic particles. Depending on the dominating structural matrix, we distinguish and analyze organic–inorganic (OI) hybrids, nanocomposite materials, and inorganic–organic (IO) phases. These materials have been used in a wide variety of applications, including energy‐storage applications, electrocatalysis, the harnessing of electrochromic and photoelectrochromic properties, application in display devices, photovoltaics, and novel energy‐conversion systems, proton‐pump electrodes, sensors, or chemiresistive detectors, which work as artificial “noses”. 相似文献
20.
《Current Opinion in Solid State & Materials Science》2017,21(2):55-67
Organic materials are ubiquitous in all aspects of our daily lives. Increasingly there is a need to understand interactions between different organic phases, or between organic and inorganic materials (hybrid interfaces), in order to gain fundamental knowledge about the origin of their structural and functional properties. In order to understand the complex structure–property–processing relationships in (and between) these materials, we need tools that combine high chemical sensitivity with high spatial resolution to allow detailed interfacial characterisation. Analytical transmission electron microscopy (TEM) is a powerful and versatile technique that can fulfil both criteria. However, the application of analytical TEM to organic systems presents some unique challenges, such as low contrast between phases, and electron beam sensitivity. In this review recent analytical TEM approaches to the nanoscale characterisation of two systems will be discussed: the hybrid collagen/mineral interface in bone, and the all-organic donor/acceptor interface in OPV devices. 相似文献