Crystallization and Vitrification of a Cyanurate Trimer in Nanopores

被引:14
作者
Koh, Yung P. [1 ]
Simon, Sindee L. [1 ]
机构
[1] Texas Tech Univ, Dept Chem Engn, Lubbock, TX 79409 USA
基金
美国国家科学基金会;
关键词
POLY(VINYLIDENE FLUORIDE)/CLAY NANOCOMPOSITES; GLASS-TRANSITION TEMPERATURE; M DICYANATE ESTER; POLYMER CRYSTALLIZATION; MELTING BEHAVIOR; FINITE-SIZE; CONFINEMENT; KINETICS; LIQUIDS; MORPHOLOGY;
D O I
10.1021/jp303318e
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effects of nanopore confinement on the crystallization and vitrification of a low molecular weight organic material, tris(4-cumylphenol)-1,3,5-triazine, are investigated using differential scanning calorimetry. The material shows cold crystallization and subsequent melting in the bulk state. Under the nanoconfinement of controlled pore glasses (CPG), cold crystallization and melting shift to lower temperatures. Crystallization kinetics are hindered in nanoconfinement, and no crystallization occurs in 13 nm diameter pores over the course of a week. Using a traditional Avrami analysis, the restricted crystallization under nanopore confinement is quantified; for crystallization at 80 degrees C, the Avrami exponent decreases with decreasing pore size and the overall crystallization rate is approximately 30 times slower for material confined in 50 nm diameter pores than the bulk. When compared at the temperature at which the crystallization rate is a maximum, the Avrami exponent is higher in nanoconfined samples and the crystallization rate is approximately 10 times slower for material confined in 50 nm diameter pores. Under CPG nanoconfinement, the glass transition temperature also decreases and shows two values; interestingly, the T-g values further decrease with increasing crystallinity.
引用
收藏
页码:7754 / 7761
页数:8
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