Characterization and Mechanical Properties of Flexible Dimethylsiloxane‐Based Inorganic/Organic Hybrid Sheets
Characterization and Mechanical Properties of Flexible Dimethylsiloxane‐Based Inorganic/Organic Hybrid Sheets
复制标题
柔性二甲基硅氧烷基无机/有机混合片材的表征和机械性能
DOI：
10.1111/j.1151-2916.2002.tb00238.x
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发表时间：
2004
影响因子：
3.9
通讯作者：
N. Yamada
中科院分区：
文献类型：
--
作者：
S. Katayama;Kubo Yuji;N. Yamada
以聚二甲基硅氧烷（PDMS）和金属醇盐Zr、Ta为原料，制备了尺寸约为200 mm × 290 mm、厚度约为1.5 mm的柔性大片状二甲基硅氧烷基无机/有机杂化材料。采用XPS、EXAFS、FT-IR、HRTEM和SAXS等手段对杂化材料进行了表征。发现在基于二甲基硅氧烷的混合片材中衍生自金属醇盐的无机组分以尺寸为2-3 nm或更小的氧化物样簇存在，其通过M-O-Si键化学连接到PDMS。杂化片材显示出高的伸长率、强度和热稳定性。在180 °C下在Zr（OBun）4/PDMS = 2中制造的混杂片材中观察到约100%的高伸长率，并且在180°C下在Zr（OBun）4/PDMS = 4中制造的那些中观察到约3.0MPa的高拉伸强度。混合片材的柔性在N2中保持至少至200°C持续100小时。这些特征被认为来自于金属醇盐衍生的无机组分，其接近于分子水平的尺寸，并且表现为PDMS链的强交联剂。
Flexible large sheets of dimethylsiloxane-based inorganic/organic hybrids with sizes of ∼200 mm × 290 mm and ∼1.5 mm thickness have been fabricated from poly(dimethylsiloxane) (PDMS) and metal alkoxides of Zr and Ta. The hybrid sheets were characterized by XPS, EXAFS, FT-IR, HRTEM, and SAXS. The inorganic components derived from metal alkoxides in the dimethylsiloxane-based hybrid sheets were found to be present as oxide-like clusters with sizes of 2–3 nm or below, which were chemically attached to PDMS via M–O–Si bonds. The hybrid sheets showed high elongation, strength, and thermal stability. A high elongation of about 100% was observed in the hybrid sheets fabricated in Zr(OBun)4/PDMS = 2 at 180°C and a high tensile strength of about 3.0 MPa was observed in those fabricated in Zr(OBun)4/PDMS = 4 at 180°C. The flexibility of the hybrid sheets was kept at least to 200°C for 100 h in N2. These features are thought to come from the inorganic components derived from metal alkoxides, which are close to the molecular-level size and behave as a strong cross-linking agent of PDMS chains.