有很多種方法可用來測高分子分子量分佈，如凝膠滲透層析法（Gel permeation chromatography）、光散射法（light scattering）及基質輔助激光質譜儀（MADLI-MS）等等。但是這些方法有它們各自的缺點，如凝膠滲透層析法對高分子量不靈敏容易塞管；光散射法對低分子量有誤差且需要有精確的折射率，而基質輔助激光質譜儀所測得之分子量偏低等等。因此基於大小分子量的高分子都會對其黏彈性質有所貢獻的理由，本研究擬建立一高分子溶液黏彈性質之研究模型，來探討其應用於評估線性高分子分子量分佈的可能性，作為更完善之分子量分佈量測方法的發展基礎。
在流變學的領域中，已經發展出一種經由熔融態線性高分子的黏彈性質（彈性模數與黏滯模數）去轉換成其分子量的分佈情形。因此本研究選定聚異丁烯（polyisobutylene）為研究的線性高分子物質，探討高分子在熔融態及溶液態下黏彈性質的異同，更針對溶劑與高分子間的作用力、高分子的分子量、濃度與溫度等影響黏彈性質的因素作深入的研究。從結果可得到高分子溶液的黏彈性質與濃度及溫度的經驗式，也觀察到在溶液態下分子量分佈的範圍會隨著濃度的提高而變廣的現象，而且更可以發現到鬆弛時間的乘冪係數越小分子量分佈就會越廣，反之鬆弛時間的乘冪係數越大分子量的分佈就越窄。所以，本研究提供了一個量測高分子溶液之分子量分佈方法的研究途徑。

There are many ways to measure the distribution of molecular weight of polymers, such as gel permeation chromatography (GPC), light scattering, and MADLI-MS, etc. But there still exists many problems. GPC encounters a problem of clogging, and not sensitive. Light scattering is not suitable for measuring low molecular weight polymers, and it needs precise reflection index. The molecular weight is lower as measured by MADLI-MS. Since both high and low molecular weight polymers would contribute to the viscoelastic property of a polymer solution, the aim of our research is to establish a research model for the viscoelastic property of polymer solutions, and to investigate its ability for examining the molecular weight distribution for a further method development.
In the field of rheology, the relationships between the viscoelastic property (elastic modules and viscous modules) of polymer melt and its molecular weight distribution have been developed. In this study, a linear polymer, polyisobutylene (PIB) will be used to investigate the differences of viscoelastic property between polymer melt and polymer solution, and also a series of discussions about how to make clear the interactions between polymer and solvent, molecular weight, concentration, and temperature of the viscoelastic property of polymer solution were carried out. From the results, we can get the experience equations of viscositic and elastic modulus with concentration and temperature and we observe the molecular weight distribution is broader as concentration goes higher. Furthermore, we also find the lower the relaxation time exponent α the broader the molecular weight distribution. On the other hand, the higher the relaxation time exponent α the narrower the molecular weight distribution. Consequently, this study approves a way about the molecular weight distribution of polymer solution study.

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