硅倍半氧烷-环氧杂化材料的研究

将环己基硅倍半氧烷硅三醇与环氧树脂E-51在环烷酸钴催化下进行反应,制成硅倍半氧烷-环氧杂化材料.通过傅立叶红外光谱、差热分析证实,反应具有较低的活化能,只是笼型结构外围的Si-OH与环氧基团进行反应,反应对笼型结构无影响;动态力学性能与热稳定性的分析表明,与4,4′-二氨基二苯砜固化的环氧固化物相比,硅倍半氧烷-环氧杂化材料具有较高的玻璃化转变温度、储能模量及热分解温度和热残余量.     

低聚硅倍半氧烷在HTPB复合推进剂中的多功能作用

为提升复合固体推进剂的综合性能，将不同质量分数的八苯基硅倍半氧烷(OPS)、八氨基苯基硅倍半氧烷(OAPS)、八硝基苯基硅倍半氧烷(ONPS)和八(二硝基苯基)硅倍半氧烷(ODNPS)等4种有机-无机杂化结构的多面体低聚硅倍半氧烷(POSS)加入端羟基聚丁二烯(HTPB)推进剂中。使用电子万能试验机、热机械分析仪测定推进剂的拉伸力学性能；使用氧弹量热仪测定推进剂在3MPa氮气下的爆热；利用线扫描摄像燃速测定系统测定了推进剂的燃速—压强关系；采用扫描电镜、激光粒度仪和X射线衍射仪(XRD)对推进剂爆热测试后的凝聚相燃烧产物进行微观形貌、粒度及物相分析；采用同步热分析仪、扫描电镜(SEM)、透射电镜(TEM)、X射线光电子能谱仪(XPS)等对POSS影响推进剂燃烧的机理进行了分析。结果表明，4种POSS均可增强推进剂的拉伸力学性能，八氨基苯基硅倍半氧烷(OAPS)效果最优；4种POSS均可提高推进剂的燃速，ONPS质量分数为3%时，推进剂燃速及爆热最高；4种POSS均可促进推进剂铝燃烧，明显减小凝聚相燃烧产物的粒径，ODNPS效果最优。分析认为，ONPS和ODNPS热解、燃烧产生的纳米尺寸...     

元素有机聚合物及其涂料

用于高温环境下的有机硅垫圈涂料组合物,多面体低聚体倍半硅氧烷及作为涂料、复合物和助剂的金属化多面体低聚倍半硅氧烷,含甲硅烷基的聚乙烯醇防雾剂及其涂覆的透明件,基于聚硅氮烷的亲水涂料,     

多面体低聚硅倍半氧烷的研究进展

综述了多面体低聚硅倍半氧烷（POSS）的结构特性和合成方法，重点介绍了同取代基、单官能度、双官能度、多官能度四类POSS的合成方法，比较了各种合成方法的优劣，展望了POKS合成研究的发展方向。     

技术讲座球形硅树脂微粉(续)

介绍了氨基改性、环氧基改性、乙烯基改性聚有机硅倍半氧烷球形微粉的制备方法，以及聚甲基硅倍半氧烷与聚苯基硅倍半氧烷双层结构的球形硅树脂微粉、疏水性硅树脂球形微粉、表层为聚二甲基硅氧烷的硅树脂球形微粉、紫外光吸收性硅树脂球形微粉、多种链节的硅树脂球形微粉的制备方法。     

无机-有机纳米杂化烧蚀材料的制备及其性能

为研制新型少烟、低密度、耐烧蚀材料,将笼形八乙烯基硅倍半氧烷（OVP）与三元乙丙橡胶（EPDM）通过双辊混炼机制成无机-有机纳米杂化烧蚀材料,考察了材料的力学、烧蚀、低特征信号和密度等主要性能。结果表明,用OVP取代部分聚磷酸铵（APP）后烧蚀材料的线烧蚀率显著降低,从0.077mm/s降低到0.056mm/s,同时烟雾和密度也有所降低。     

聚(乙烯基)硅倍半氧烷的结构表征

以乙烯基三乙氧基硅烷为原料,通过控制水解聚合条件制得聚(乙烯基)硅倍半氧烷。IR光谱表征产物中形成了Si—O—Si的骨架结构,29SiNMR表征说明产物是以笼形结构为主,用GPC测得的摩尔质量接近五面体(T6)和六面体(T8)结构的笼形聚(乙烯基)硅倍半氧烷;通过对产物平均几何参数的计算,确定产物为笼形T6结构的聚(乙烯基)硅倍半氧烷。     

聚合物纳米复合材料的最新进展

介绍了聚合物纳米复合材料的最新进展，包括纳米粘土复合材料、无机纳米粒子复合微球、采用多面体低聚倍半氧硅烷技术合成的增强剂POSS及碳纳米管等的性能及其应用。     

POSS改性聚合物复合材料阻燃性及热稳定性研究进展

综述了近几年关于多面体低聚倍半硅氧烷(POSS)改性聚合物复合材料阻燃性及热稳定性方面的机理及POSS在聚合物改性中的应用,展望了今后的研究方向.     

离子型聚合反应机理制备聚合物/POSS纳米杂化材料的研究进展

多面体低聚倍半硅氧烷（POSS,Polyhedral Oligomeric Silsesquioxane）作为一种特殊的有机/无机杂化纳米粒子备受关注。本文综述了国内外通过离子型反应机理制备聚合物/POSS纳米杂化材料的一些进展,着重介绍反应机理、特点,并对这一领域的前景进行了展望。     

Synthesis,structure, and properties of high‐impact polystyrene/octavinyl polyhedral oligomeric silsesquioxane nanocomposites

The organic–inorganic hybrid nanocomposites from high‐impact polystyrene/octavinyl polyhedral oligomeric silsesquioxane (HIPS/POSS) containing various percentages of POSS were prepared by free radical polymerization and characterized by Fourier transform infrared spectroscopy (FTIR), ¹H‐NMR, thermal gravity analysis (TGA), X‐ray diffraction (XRD), and transmission electron microscopy (TEM). The octavinyl POSS has formed covalent bond connected PS‐POSS hybrid with polystyrene. POSS can well disperse in the composites at the composition of 0.5 and 1 wt%. The mechanical properties and thermostability of HIPS/POSS nanocomposites were significantly improved. The tensile strength, the izod impact strength, and the elongation at break of the nanocomposite containing 1 wt% of POSS was increased, respectively, by 15.73%, 75.62%, and 72.71% in comparison with pristine HIPS. The thermal decomposition temperature of HIPS/POSS (1 wt% of POSS) was 33°C higher than that of pristine HIPS. The HIPS/POSS nanocomposites showed great potential for applications in many fields, such as electric appliance and automotive trim. POLYM. COMPOS. 37:1049–1055, 2016. © 2014 Society of Plastics Engineers     

氨基POSS/环氧树脂有机无机杂化材料的动态力学性能

为了提高环氧树脂(EP)的综合性能,以含氨基官能团的笼型倍半硅氧烷(POSS)作为EP的改性剂,得到有机-无机POSS改性EP杂化树脂;然后以4,4′-二氨基二苯基砜(DDS)为固化剂对杂化树脂进行固化,得到有机-无机杂化材料。重点考察了POSS含量对杂化材料动态力学性能的影响。结果表明:不同杂化材料体系均呈单相结构,POSS在EP基体中分散较均匀,说明两者间相容性良好;随着POSS含量的不断增加,杂化材料体系的玻璃化转变温度(Tg)增大,与传统杂化材料不同的是损耗峰强度随POSS含量增加而降低,但损耗峰宽度几乎不变。     

Poly(methyl methacrylate)/POSS hybrid networks by type II photoinitiated free radical polymerization

A new strategy for organic–inorganic hybrid networks is presented through in‐situ Type II photoinitiated polymerization of methyl methacrylate with diethanolamino‐functionalized polyhedral oligomeric silsesquioxanes (POSS‐DEA). The diethanolamino groups are simply incorporated onto POSS nanoparticles by nucleophilic ring‐opening reaction of commercially available epoxycyclohexyl POSS and diethanol amine. The photoinitiated polymerization of methyl methacrylate in the presence of benzophenone as photosensitizer and POSS‐DEA as hydrogen donor leads to poly(methyl methacrylate) (PMMA)/POSS hybrid networks under UV light irradiation. The morphology and thermal properties of hybrid networks are investigated by using Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, and transmission electron microscopy. The morphology results confirm that POSS cages are homogeneously distributed in PMMA matrix at the molecular levels, whereas the thermal analyses shows that the obtained hybrid networks have higher glass transition temperatures and better thermal stabilities compared to parent PMMA homopolymer. POLYM. COMPOS., 35:1614–1620, 2014. © 2013 Society of Plastics Engineers     

甲基笼型倍半硅氧烷/CE杂化复合材料的力学性能

以甲基笼型倍半硅氧烷(POSS)作为氰酸酯树脂(CE)的改性剂,制备出一种POSS/CE杂化复合材料。研究了杂化复合材料中POSS用量对CE结构及力学性能的影响,同时采用红外光谱(FT-IR)法对不同POSS/CE体系的反应性进行了研究。结果表明:POSS的加入对CE的反应性影响不大,有利于POSS/CE杂化体系固化工艺的制定;当杂化体系中w(POSS)=5%时,材料的冲击强度(9.7 kJ/m2)相对最大(提高了49%),弯曲强度(90 MPa)也相对较高,说明适量的POSS对CE具有明显的增韧、增强作用。     

The effects of structure of POSS on the properties of POSS/PMMA hybrid materials

Octa‐vinyl polyhedral oligomeric silsesquioxane (V‐POSS) and octa‐(methacryloxy) propyl polyhedral oligomeric silsesquioxane (M‐POSS) were incorporated into PMMA to prepare POSS/PMMA hybrid materials at molecular level via in situ polymerization. The resulting hybrid materials showed only swelling instead of solution in ethyl acetate, while pristine PMMA completely dissolved in ethyl acetate; moreover, the M‐POSS/PMMA hybrid materials exhibited more excellent resistance to solvent stress cracking. An excellent transparency was observed for all hybrid materials. Incorporation of V‐POSS and M‐POSS significantly improved thermal properties of PMMA. The thermal decomposition temperature of hybrid materials was enhanced except a slightly compromised initial decomposition temperature. The hybrid materials prepared with 0.2–0.6 mol% M‐POSS or V‐POSS improved the reinforcing and toughening properties in comparison to pristine PMMA. Also, the incorporation of POSS decreased the dielectric constant and dielectric loss of the hybrid materials with more voids introduced into the composites no matter the structure of POSS. POLYM. ENG. SCI., 55:565–572, 2015. © 2014 Society of Plastics Engineers     

POSS/聚合物有机-无机杂化材料的研究进展

介绍了笼型倍半硅氧烷(POSS)的特点。综述了POSS/聚合物杂化材料近年来的研究进展(包括POSS/环氧树脂杂化材料、POSS/聚酰亚胺杂化材料、POSS/有机硅杂化材料、POSS/聚乙烯杂化材料、POSS/聚丙烯杂化材料和其他类型含POSS的杂化材料等),并对其应用前景进行了展望。     

Novel phenyl‐POSS/polyurethane aqueous dispersions and their hybrid coatings

A facile and rapid preparation of 3‐(2‐aminoethylamino)propylheptaphenylPOSS (AA‐POSS), a special phenyl‐POSS that contains two functional amino groups (Scheme 1), is demonstrated by the corner‐capping method. Then AA‐POSS forms a series of novel phenyl‐POSS/PU aqueous dispersions. The structure of AA‐POSS has been confirmed by ¹H, ¹³C, ²⁹Si NMR, and ESI‐MS. The POSS/PU hybrid films are studied by Fourier transform infrared spectrometer (FT‐IR), gel permeation chromatography (GPC), scanning electron microscope (SEM), X‐ray diffraction (XRD) spectra, differential scanning calorimetry (DSC) analysis, and thermal gravimetric analyzer (TGA). FT‐IR and GPC are conducted to validate the chemical structure of the hybrid PU. The properties of hybrid films display significant changes with notable increases in T_g, thermal properties, tensile strength, as well as surface hydrophobicity. These changes are attributed to the incorporation of novel POSS into PU. Moreover, these significant material property enhancements are achieved at low levels of POSS incorporation (only 4%). © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1611–1620, 2013     

Synthesis and characterization of POSS hybrid organogels using Menschutkin quaternization chemistry

The present research describes a series of organic–inorganic hybrid gels based on polystyrene and polyhedral oligomeric silsesquioxanes (POSSs) prepared using free radical copolymerization and Menschutkin chemistry techniques. In the first step, poly(styrene‐co‐chloromethylstyrene) is readily achieved by thermally initiated radical copolymerization and the subsequently obtained copolymer reacts with diethanolamine functional POSS nanoparticles which are employed as the crosslinker. The resulting hybrid network possesses ionic moieties and inorganic POSS nanoparticles. The POSS‐containing hybrid gels exhibit excellent organic solvent absorption and show good mechanical behaviour. Gel containing 0.8 × 10^?3 mmol of POSS(DEA)₈ (DEA, diethanolamine) reached the highest swelling ratio; hence, the corresponding gel can absorb organic solvent up to 20× its weight. The rate constant, coefficients and diffusional behaviour of hybrid organogels in organic solvent were examined as well. The organic solvent intake of the hybrid gel follows a non‐Fickian type diffusion. © 2018 Society of Chemical Industry     

Zirconium-Embedded Polyhedral Oligomeric Silsesquioxane Containing Phosphaphenanthrene-Substituent Group Used as Flame Retardants for Epoxy Resin Composites

A zirconium hybrid polyhedral oligomeric silsesquioxane derivative (Zr–POSS–bisDOPO) is synthesized by the corner-capping and Kabachnik–Fields reactions. It is characterized by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy (NMR), and then used as a flame retardant in diglycidyl ether of bisphenol A (DGEBA) to endow epoxy resin (EP) with flame retardancy. The flame retardancy, thermal stability, and mechanical properties of the cured EP/Zr–POSS–bisDOPO composites are investigated. The results show that when Zr–POSS–bisDOPO is added by 5–7 wt%, the EP/Zr–POSS–bisDOPO composites pass the UL-94 V-0 rating test. In addition, they have a better flame-retardant effect than pure EP. The combination of Zr atom embedded in the Si O cubic cage and the two phosphaphenanthrene substituent groups in one corner of cubic cage is expected to realize the Zr/Si/P ternary intramolecular hybrid synergistic effect and achieve the possibility of dispersing metal–POSS cages at a sub-micrometer-scale level into polymer matrix. It also proves that Zr–POSS–bisDOPO produces phosphorus-containing free radicals and terminates the chain reactions in gas phase. Meanwhile the Si O Si and Zr O units are retained in the solid phase, which promote the char formation and enhance the flame retardancy. This kind of Zr-doped POSS will be helpful for developing the new metal–POSS hybrid flame-retardant and polymer composites.