| 摘要 |
The invention provides a fluorothermoplastic composition comprising interpolymerized units derived from about 94 to about 97.5 mole percent (mol %) tetrafluoroethylene (TFE), about 2 to about 3 mol % perfluoro (propyl vinyl ether) (PPVE), and about 0.5 to about 3 mol % hexafluoropropylene (HFP). The invention also provides a fluorothermoplastic composition comprising interpolymerized units derived from about 94 to about 97 mol % TFE, about 0.75 to about 3 mol % PPVE, and about 1.5 to about 3.5 mol % HFP. These fluorothermoplastic compositions have a flex life that fits the equation: <?in-line-formulae description="In-line Formulae" end="lead"?>log(flex life cycles)>=0.71+4.0*(MFI<SUP>(-0.294)</SUP>),<?in-line-formulae description="In-line Formulae" end="tail"?> a method of making fluorothermoplastic compositions, a method of improving stress crack resistance, and fluorothermoplastic articles.
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