【作者】 唐亚林； 屈小中； 陈柳生； 金熹高；

【Author】 Tang Ya-lin Qu Xiao-zhong Chen Liu-sheng Jin Xi-gao (The Institute of Chemistry,Chinese Academy of Science,Beijing 100080,China)

【机构】 中国科学院化学研究所；

【摘要】 <正>纳米材料是材料科学的一个重要发展方向,由于其极细的微粒,大量晶界和晶粒内缺陷的中心原子以及其本身具有的量子尺寸效应、小尺寸效应、表面效应和宏观量子隧道效应等, 纳米材料与同组成的微米(体相)材料相比,在催化、光学、磁性、力学等方面具有许多奇异的性能,因而成为材料科学和凝聚态物理领域中的研究热点。本文从分子层面上研究了一种典型纳米材料—聚苯乙烯非晶型纳米颗粒的分子结构和分子运动,试图通过本文的研究深入了解其原子、分子的运动规律和物理本质。更多还原

【Abstract】 Carbon spin-lattice relaxation times were measured for different annealing temperature samples of nano-latex particles polystyrene and bulk polystyrene,the results show that the curves of T_1L for polystyrene nanolatex particles vs annealing temperature have the dramatic increase at 80℃ annealing temperature which is well below the Tg temperature of bulk polystyrene,the increase of T_1L value of aromatic carbons is larger than that of T_1L’s for aliphatic carbons in 80℃ annealing temperature polystyrene nanolatex particles,the increase of T_1L values of C₄ of phenyl rings is larger than that for C₁ of phenyl ring.On the basis of studying of correlation time and molecular motion in samples,the explanation for the phenomena is thought to be that the rotation of the phenyl rings might be hindered because of entanglement in main chain and the overlap of phenyl rings and that the phenyl rings in nanolatex particles are easier to overlap than in bulk polystyrene.更多还原