Influence of octakis-functionalized polyhedral oligomeric silsesquioxanes on the physical properties of their polymer nanocomposites
Influence of octakis-functionalized polyhedral oligomeric silsesquioxanes on the physical properties of their polymer nanocomposites
复制标题
DOI：
10.1016/j.polymer.2009.08.026
复制
发表时间：
2009-09
期刊：
影响因子：
4.6
通讯作者：
Kai-Wei Huang;Lindsay Tsai;S. Kuo
中科院分区：
文献类型：
--
作者：
Kai-Wei Huang;Lindsay Tsai;S. Kuo
通过与八（二甲基硅氧基）倍半硅氧烷（Q8 M8 H）的硅氢加成反应，合成了多面体低聚倍半硅氧烷（POSS）衍生物八[二甲基（苯乙基）硅氧基]倍半硅氧烷（OS-POSS）、八[二甲基（4-乙酰氧基苯乙基）硅氧基]倍半硅氧烷（OA-POSS）和八[二甲基（4-羟基苯乙基）硅氧基]倍半硅氧烷（OP-POSS）。为了研究这些八官能化POSS衍生物在聚合物纳米复合材料中的影响，我们将OP-POSS、OA-POSS和OP-POSS与均聚物聚（环氧乙烷）（PEO）共混，并表征其产生的分子间相互作用（例如，羟基-醚和羰基-环氧乙烷）。采用差示扫描量热法（DSC）和动态力学分析（DMA）研究了这些共混体系的热性能。结晶聚合物和这些无机纳米粒子的可混溶的二元共混物中的结晶动力学也通过DSC和光学显微镜（OM）分析确定。在此，我们强调POSS纳米复合材料上的功能基团对PEO的结晶动力学的影响。结果表明，OP-POSS/PEO共混物具有最高的热稳定性和最低的结晶速率，这是由于OA-POSS/PEO中羟基和醚基之间的氢键作用强于羰基和亚甲基之间的氢键作用。
We synthesized the polyhedral oligomeric silsesquioxane (POSS) derivatives octakis[dimethyl(phenethyl)siloxy]silsesquioxane (OS-POSS), octakis[dimethyl(4-acetoxy phenethyl)siloxy]silsesquioxane (OA-POSS), and octakis[dimethyl(4-hydroxyphenethyl)siloxy] silsesquioxane (OP-POSS) through hydrosilylation with octakis(dimethylsiloxy)silsesquioxane (Q8M8H). To investigate the influence of these octuply functionalized POSS derivatives in polymer nanocomposites, we blended OP-POSS, OA-POSS, and OP-POSS with the homopolymer poly(ethylene oxide) (PEO) and characterized its resulting intermolecular interactions (e.g., hydroxyl–ether and carbonyl–ethylene oxide) using FTIR spectroscopy. The thermal properties of these blend systems were investigated using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The crystallization kinetics in the miscible binary blends of the crystalline polymer and these inorganic nanoparticles were also determined through DSC and optical microscopy (OM) analyses. Herein, we emphasize the effects of the functional groups on POSS nanocomposites on the crystallization kinetics of PEO. We found that OP-POSS/PEO blend had the highest thermal stability and lowest crystallization rate because its hydrogen bonding interactions (between its hydroxyl and ether units) were stronger than those (between carbonyl and methylene groups) in OA-POSS/PEO.