Effect of temperature, crystallinity and molecular chain orientation on the thermal conductivity of polymers: a case study of PLLA

被引:104
作者
Bai, Lu [1 ]
Zhao, Xing [1 ]
Bao, Rui-Ying [1 ]
Liu, Zheng-Ying [1 ]
Yang, Ming-Bo [1 ]
Yang, Wei [1 ]
机构
[1] Sichuan Univ, Coll Polymer Sci & Engn, State Key Lab Polymer Mat Engn, Chengdu 610065, Sichuan, Peoples R China
基金
中国国家自然科学基金;
关键词
ELECTRIC ENERGY-CONVERSION; PHASE-CHANGE MATERIALS; AMORPHOUS HIGH POLYMERS; GRAPHENE NANOPLATELETS; POLYETHYLENE FIBERS; POROUS SCAFFOLDS; SHAPE STABILITY; COMPOSITES; CRYSTALLIZATION; NITRIDE;
D O I
10.1007/s10853-018-2306-4
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The crystallinity of semicrystalline polymers and molecular orientation of polymer have long been considered to be significant influencing factors on the thermal conductivity of polymer materials, but more clear-cut understanding on their impact on the thermal conductivity is still needed. In this work, poly-L-lactide (PLLA), whose crystallinity and orientation can be adjusted in a wide range, is selected to discuss the effect of degree of crystallinity and orientation on the thermal conductivity of PLLA. Meanwhile, the influence of temperature on the thermal conductivity is also discussed. PLLA compression-molded samples were heat-treated at 120 degrees C to tune the crystallinity of the samples, while the degrees of orientation were tuned by stretching the amorphous PLLA bars at 60 degrees C to different strains. It is found that environmental temperature of application affects the thermal conductivity obviously and the glass transition temperature of polymers shows a strong influence on the thermal conductivity of PLLA. Below T-g, the thermal conductivity of PLLA with different crystallinity increases with temperature and when the temperature is higher than T-g, the thermal conductivity of PLLA with different crystallinity decreases remarkably. It is also demonstrated that the thermal conductivity of PLLA increases with the increase in crystallinity, and the tensile strain linearly increases the thermal conductivity in the direction of molecular orientation and decreases the thermal conductivity in the perpendicular direction, which are in agreement with other semicrystalline polymers that has been reported.
引用
收藏
页码:10543 / 10553
页数:11
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