• 作者： 黃良平
• 作者服務機構： 國立臺灣大學化學系; 中央研究院生物化學研究所
• 中文摘要： 本文中，我們發展了稀溶液中高分子鏈核弛緩理論，主要的是將高分子想像成由副鏈接成。在副鏈裹，局部且共聯性運動較鏈運動為快，而鏈運動是以“彈簧串珠”模式加上流體動力理論處理，實驗上可由1/T 和1/T 之差來研究。核雙極矩弛緩光譜密度所需參數可從高分子分子量和實質黏滯係數間的關係，由實驗求得，進而配合數值分析得到光譜密度。此一理論首先應用於聚氧乙烯溶液，未來理論及實驗發展也在本文中略加討論。
• 英文摘要： The spin relaxation theory of macromolecular chain in dilute solution has been developed. Themacromolecular chain is partitioned into subchains. The local motion of cooperative nature within thesubchain is considered much faster than the chain fluctuations, which are treated with the bead and springmodel incorporating the preaveraged Oseen hydrodynamic interaction. Numerical solutions of dipolarspectral density for the chain diffusion processes are obtained．It is found that the chain diffusion processesmay be studied from the difference between spin-spin and spin-lattice relaxation rates. This quantity maybe directly evaluated from the Rouse-Zimm theory and from the parameters used in the study of molecular-weight dependence of intrinsic viscosity．Attempt to explain experimental results for polyoxyethylene insolution is made. The aspect concerning further development in experiment and theory is briefly discussed.
• 中文關鍵字： NMR relaxation; polymer chain diffusion
• 英文關鍵字： --