聚对二炔苯Mark-Houwink方程参数的确定及分子量与分子量分布的研究

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通过多个宽分布聚对二炔苯试样的凝胶渗透色谱(GPC)和特性粘数([η])的测定,应用普适校正原理和Weis方法,确定了该聚合物在四氢呋喃溶液中25℃下的MarkHouwink方程参数:K=762×10-3,α=026.将这一结果运用到GPC谱图的计算,所得[η]与用粘度法实测值比较,所得Mn与用VPO法实测值比较,相对误差6%左右.还研究了聚合反应条件对聚对二炔苯分子量与分子量分布的影响,发现随着聚合时间的延长和聚合温度的升高,聚合物分子链间发生部分交联反应,支化程度加重.聚合过程中还可能存在向单体的链转移反应. The gel permeation chromatography (GPC) and intrinsic viscosities ([η]) of polypyrrole samples with a wide range of distributions were determined by the universal calibration principle and the Weis method. The results show that the polymer is soluble in tetrahydrofuran solution Mark  Hauwink equation parameters at 25 ℃: K = 7  62 × 10-3, α = 0  26. This result was applied to the calculation of the GPC chart. The obtained [η] was compared with the measured value by the viscosity method. The obtained Mn was compared with the measured value by the VPO method, and the relative error was about 6%. The effects of polymerization conditions on the molecular weight and molecular weight distribution of poly (p - diphenylenes) were also studied. It was found that with the extension of polymerization time and the increase of polymerization temperature, partial cross - linking reaction occurred between the molecular chains of the polymers and the branching degree increased. There may also be chain transfer reactions to the monomers during the polymerization.
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