Effect of Chain Dynamics, Crystallinity, and Free Volume on the Barrier Properties of Poly(ethylene terephthalate) Biaxially Oriented Films

被引：121
作者：
Zekriardehani, S. [1 ]
Jabarin, S. A. [1 ]
Gidley, D. R. [2 ]
Coleman, M. R. [1 ]
机构：
[1] Univ Toledo, Dept Chem Engn, Toledo, OH 43606 USA
[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA
来源：
MACROMOLECULES | 2017年 / 50卷 / 07期
关键词：
ANNIHILATION LIFETIME SPECTROSCOPY; STRAIN-INDUCED CRYSTALLIZATION; POLYETHYLENE TEREPHTHALATE; POSITRON-ANNIHILATION; SEMICRYSTALLINE POLYMERS; GLASS-TRANSITION; GAS SORPTION; ORIENTATION; PET; RELAXATION;
D O I：
10.1021/acs.macromol.7b00198
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The primary focus of this work was to evaluate the relationship between free volume distribution, chain motion, crystallinity, and the gas properties of PET upon strain-induced crystallization (SIC) at different stretch ratios. The formation of a three-phase structure containing rigid amorphous phase, mobile amorphous phase, and crystalline phase upon SIC was confirmed by differential scanning calorimetry and positron annihilation lifetime spectroscopy (PALS). Dynamic mechanical analysis and PALS indicated that there was a significant reduction in the fractional free volume upon orientation at an extension ratio of 3 x 3. Sub-T-g relaxation studies indicated that the activation energy of mechanical relaxation decreased with increasing the stretch ratio. Gas transport studies revealed that the reduction in permeability coefficient was mainly due to reduction in diffusivity. Permeation studies using gas molecules with different sizes revealed that strain-induced crystallization affects the free volume distribution as well as reducing the average fractional free volume.
引用
收藏
页码：2845 / 2855
页数：11
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