| SBA-15负载有机金属钛(Ⅳ)催化剂合成纳米聚乙烯纤维(英文) |
| Preparation of Nano-polyethylene Fibers by SBA-15-supported Half-sandwich Titanium(Ⅳ) Aryloxy Catalyst |
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| 摘要: 通过介孔分子筛SBA-15负载半夹心结构有机金属钛(Ⅳ)催化剂在一定的反应温度(20～80 ℃)和1 013 kPa乙烯压力下合成了纳米聚乙烯纤维。讨论并比较了负载剂和聚合条件对催化活性、聚合物分子量及聚合物形态的影响。相对于均相催化剂而言，催化活性有所降低，但聚合物分子量明显增大，达到106数量级。在相同压力下，从低温到高温，聚乙烯形态也从细小纤维束逐渐变粗，更高温度熔成片状，80 ℃以上纤维状形态消失。这些表明，通过外部条件的选择可以得到合适的聚乙烯纤维。 |
| 关键词: 介孔分子筛SBA-15 有机钛金属催化剂 纳米聚乙烯纤维 非均相催化 烯烃聚合 |
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| Abstract: Nanofibrous polyethylene (PE) was prepared via in situ ethylene extrusion polymerization on SBA-15-supported titanium(Ⅳ) cyclopentadienyl-aryloxy catalyst under appropriate reaction temperature (20～80 ℃) and ethylene pressure (1 013 kPa). The effects of catalyst support and polymerization conditions on catalyst activity, molecular weight and morphology of polymer were investigated. Compared with homogeneous counterpart, the supported catalyst gave a little lower activity, but very high molecular weight (106) polymers were obtained. At lower temperature, the fine PE fibers were displayed. As the polymerization temperature rose, the resultant fiber bundles got thicker，and then gradually congregated into sheet polymers at higher temperature. Above approximate 80 ℃, the fiber morphologies of the polymers disappeared. These changes indicate that morphology of polymers can be regulated by extrinsic factors. CCDC: 602498. |
| Keywords: mesoporous zeolite SBA-15 titanium catalyst heterogenization nanofibrous polyethylene |
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| 陈凤太,金国新.SBA-15负载有机金属钛(Ⅳ)催化剂合成纳米聚乙烯纤维(英文)[J].无机化学学报,2006,22(11):1933-1940. |
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