Synthesis and Rheological Properties of Poly(5‐n‐hexylnorbornene)
Synthesis and Rheological Properties of Poly(5‐n‐hexylnorbornene)
复制标题
聚(5-正己基降冰片烯)的合成及流变性能
DOI：
10.1002/macp.200500228
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发表时间：
2006
影响因子：
2.5
通讯作者：
A. Greiner
中科院分区：
文献类型：
--
作者：
K. Müller;S. Kreiling;K. Dehnicke;J. Allgaier;D. Richter;L. Fetters;Youngsuk Jung;D. Yoon;A. Greiner
以[NiBr（NPMe 3）] 4 /B（C6 F5）3为催化剂，通过5-正己基-2-己烯（endo/exo=77/ 23）的乙烯基型聚合反应，获得了高分子量和高产率的聚5-正己基-2-己烯（PHNB）。尺寸排阻色谱法与在线光散射和特性粘度测量的组合允许在四氢呋喃中评估马克-霍温克表达式。通过Burchard-Stockmayer-Fixman外推法估算了聚（5-正己基降冰片烯）的无扰链尺寸。未扰动的链尺寸的这种评价反过来允许通过填充长度模型计算缠结分子量和平台模量。这允许确定这些材料的流变特性，其中常规流变测量是困难的，或不可能的。
Poly(5-n-hexylnorbornene) (PHNB) was obtained in high molecular weight and high yields by vinyl-type polymerization of 5-n-hexyl-2-norbornene (endo/exo=77/ 23) with [NiBr(NPMe 3 )] 4 /B(C 6 F 5 ) 3 as catalyst precursor. The combination of size exclusion chromatography with on-line light scattering and intrinsic viscosity measurements allowed the Mark-Houwink expressions to be evaluated in tetrahydrofuran. The unperturbed chain dimensions for poly(5-n-hexylnorbomene) were estimated via the extrapolation procedure of Burchard-Stockmayer-Fixman. This evaluation of the unperturbed chain dimension in turn permits the calculation of the entanglement molecular weight and the plateau modulus via the packing length model. This allows the determination of rheological properties for these materials where conventional rheology measurements are difficult, or impossible.