Experimental Identification of the Deformation Mechanisms During Sintering of Cold Compacted Polytetrafluoroethylene Powders

被引：12
|
作者：
Canto, Rodrigo Bresciani [1 ,2 ]
Schmitt, Nicolas [2 ,3 ]
De Carvalho, Jonas [4 ]
Billardon, Rene [2 ]
机构：
[1] Univ Fed Sao Carlos, Dept Mat Engn DEMa, BR-13565905 Sao Carlos, SP, Brazil
[2] Univ Paris 06, LMT Cachan, ENS Cachan, CNRS,UMR 8535, F-94235 Cachan, France
[3] Univ Paris Est Creteil Val de Marne, F-93203 St Denis, France
[4] Univ Sao Paulo, Engn Sch Sao Carlos, Dept Mech Engn, BR-13566590 Sao Carlos, SP, Brazil
来源：
POLYMER ENGINEERING AND SCIENCE | 2011年 / 51卷 / 11期
关键词：
SEMICRYSTALLINE POLYMERS; PTFE; TEMPERATURE; POLY(TETRAFLUOROETHYLENE); CRYSTALLINITY; PRESSURE; STATE; SIMULATION; STRENGTH; RECOVERY;
D O I：
10.1002/pen.21994
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The influence of the cooling rate after melting on the crystalline weight fraction of pure poly(tetrafluoroethylene) (PTFE) was derived from differential scanning calorimetry tests. Specimens made of pure or filled PTFE were manufactured by isostatic or constrained uniaxial cold pressing, up to different values of the porosity. Dilatometry tests were carried out on these specimens while imposing various heating-cooling treatments. The deformations recorded during these tests strongly depend on the mode and level of compaction. The original procedures presented, herein, made it possible to identify that these macroscopic deformations, which are strongly anisotropic for uniaxially pressed specimens, result from the combination of different independent mechanisms. The mechanisms that were distinguished are reversible thermal expansion, void closure, crystalline to amorphous and vice versa transformations, and recovery, which were not observed for isostatically pressed specimens. It was also shown that, after being subjected to a standard sintering treatment, anisotropically pressed specimens still exhibit anisotropic crystallization strains. POLYM. ENG. SCI., 51:2220-2235, 2011. (C) 2011 Society of Plastics Engineers
引用
收藏
页码：2220 / 2235
页数：16
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