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ABBREVIATIONS DSC Differential scanning calorimetry EAA Ethylene-acrylic acid copolymer ECTFE Poly(ethylene chlorotrifluoroethylene
) NIPS Non-solvent induced phase separation PA Polyamide PE Polyethylene PP Polypropylene PPS Poly(phenylene sulfide) PVB Polyvinyl butyral) PVDF Poly(vinylidene fluoride) TEG Triethylene glycol TEP Triethyl phosphate TIPS Thermally induced phase separation REFERENCES
The most common commercially available fluoropolymers are based on monomers of tetrafluoroeth-ylene, vinylidene fluoride, and chlorotrifluoroethylene
. (5) Both homopolymers and copolymers of these three monomers with compounds such as perfluoroalkyl vinyl ethers, hexaffuoropropylene, chlorotrifluoroethylene
, and perfluorobutyl ethylene exhibit increased chemical and flame resistance, photo and thermal stability, and enhanced lubricity when compared to their non-fluorine containing counterparts.
PVDF can copolymerize with many fluorinated alkene monomers, such as tetrafluoroethylene, chlorotrifluoroethylene
, and hexafluoropropylene (HFP).
Abbreviation Composition PTFE Poly(tetrafluoroethylene) FEP Poly(tetrafluoroethylene-co- hexafluoropropylene) PFA Poly(tetrafluoroethylene-co- perfluoropropylvinyl ether) ETFE Poly(tetrafluoroethylene-co- ethylene) PCTFE Poly(chlorotrifluoroethylene
) ECTFE Poly(chlorotrifluoroethylene- co-ethylene) PVDF Poly(vinylidene fluoride) PVF Poly(vinyl fluoride)
Similar reinforcement due to crystallinity in the binder was found in KF-800, a c opolymer of 3/1 mole ratio chlorotrifluoroethylene
to vinylidene fluoride, in LX-17 PBX (14).
Table 2 Other Modified Polymers Primary Monomer Modifier Primary Effect(s) Vinylidene Fluoride HFP Flexibility, Impact Strength (VDF) CTFE Flexibility, Impact Strength TrFE Piezoelectric, Ferroelectric TFE Solubility, Flexibility HFA Optical Clarity Ethylene Base Resistance Chlorotrifluoroethylene
VDF Solubility, Processibility (CTFE) Table 3 Physical Property Data for MFA 620 Film.
Reding and Brown  applied various thermal techniques to poly(chlorotrifluoroethylene
) (PCTFE) and observed that the spherulites in their quenched and subsequently reheated polymer did not become as large as those in the sample slowly cooled from the melt, nor did the quenched and reheated polymer become as brittle as the melt-cooled polymer.
Films made from poly(chlorotrifluoroethylene
), PCTFE, and its copolymers with vinylidene fluoride, [VF.sub.2] ([is less than] 4%) have excellent optical, chemical, thermal, mechanical, and electrical properties.