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Influence of the molecular weight on the thermal and mechanical properties of ethyleneorbornene copolymers

机译:分子量对乙烯/降冰片烯共聚物热力学性能的影响

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A series of ethylene-norbomene copolymers were synthesized using Me2Si(Me4Cp)(NtBu)TiCl2 as the metallocene catalyst and methylaluminoxane (MAO) as the cocatalyst, with the same molecular characteristics except the molecular weight, to evaluate its influence on the determination of the glass transition temperature (T-g). The polymers were characterized using wide-angle X-ray scattering, differential scanning calorimetry, microhardness measurements, and dynamic mechanical thermal analysis. The value of the T-g, for the same norbornene content and determined from the last three mentioned methods, increases significantly up to a limit of M-n about 6-10 x 10(4) (g/mol). Above this value, T-g remains practically constant. (C) 2003 Wiley Periodicals, Inc. [References: 23]
机译:以Me2Si(Me4Cp)(NtBu)TiCl2为金属茂催化剂和甲基铝氧烷(MAO)为助催化剂,合成了一系列乙烯-降冰片烯共聚物,除分子量外,其分子特性相同,以评估其对测定三价铁的影响。玻璃化转变温度(Tg)。使用广角X射线散射,差示扫描量热法,显微硬度测量和动态机械热分析来表征聚合物。对于相同的降冰片烯含量,由后三种提及的方法确定的T-g值会显着增加,直至M-n极限约为6-10 x 10(4)(g / mol)。高于该值,T-g实际上保持恒定。 (C)2003 Wiley Periodicals,Inc. [参考:23]

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