Relationship between Structure and Mechanical Properties of Melt Processable PTFE: Influence of Molecular Weight and Comonomer Content

被引：29
作者：
Frick, Achim [1 ]
Sich, Dorota [2 ]
Heinrich, Gert [3 ,4 ]
Stern, Claudia [2 ]
Goessi, Matthias [5 ]
Tervoort, Theo A. [5 ]
机构：
[1] Aalen Univ, D-73430 Aalen, Germany
[2] ElringKlinger Kunststofftech GmbH, D-74321 Bietigheim Bissingen, Germany
[3] Leibniz Inst Polymerforsch Dresden eV IPF, D-01069 Dresden, Germany
[4] Tech Univ Dresden, Inst Werkstoffwissensch, D-01069 Dresden, Germany
[5] ETH, Dept Mat, ETH Honggerberg, CH-8093 Zurich, Switzerland
来源：
MACROMOLECULAR MATERIALS AND ENGINEERING | 2013年 / 298卷 / 09期
关键词：
environmental stress cracking resistance (ESCR); fatigue life; mechanical properties; melt processable polytetrafluoroethylene (MP PTFE); microstructure; polytetrafluoroethylene (PTFE); STRAIN-HARDENING MODULUS; SLOW CRACK-GROWTH; SEMICRYSTALLINE POLYMERS; TIE MOLECULES; DEFORMATION-BEHAVIOR; PLASTIC-DEFORMATION; POLYETHYLENE; DENSITY; MORPHOLOGY; STRESS;
D O I：
10.1002/mame.201200172
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of molecular weight and comonomer content on the mechanical properties of several melt-processable polytetrafluoroethylene (MP PTFE) materials is studied. Additionally, a comparison of mechanical properties including tensile properties and their dependence on environment as well as fatigue life of PTFE, MP PTFE and perfluoroalkoxy copolymer (PFA) is made. PTFE homopolymer and PTFE copolymers exhibit considerably different mechanical properties. The small strain deformation behaviour up to yielding correlates with the degree of crystallinity and comonomer content, whereas the large strain deformation was found to depend on intercrystalline connections, such as tie molecules and chain entanglements. The special role of these elements in determining the fatigue life and sensitivity to environmental stress cracking is also demonstrated.
引用
收藏
页码：954 / 966
页数：13
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