✦ LIBER ✦

Extreme thermal behaviors of polytetrafluoroethylene and random tetrafluoroethylene fluorinated copolymers

✍ Scribed by Rachele Pucciariello; Claudia Mancusi

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 174 KB
Volume: 73
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19990808)73:6<919::aid-app8>3.0.co;2-n

No coin nor oath required. For personal study only.

✦ Synopsis

By differential scanning calorimetry (DSC), the thermal behavior of polytetrafluoroethylene (PTFE) and random fluorinated copolymers of tetrafluoroethylenecontaining hexafluoropropylene (FEP copolymers) or perfluoroalkylvinylether (PFA copolymers) as comonomers was investigated. Rapid-melt crystallization was employed to provide new data about the problem of inclusion/exclusion of co-units from the homopolymer crystal lattice. Equilibrium melting points were determined and tested in light of random copolymer predictions. Both nonequilibrium and equilibrium behaviors seem to point to the inclusion of OCF 3 side groups and the exclusion of larger ones. Finally, a new value of the equilibrium melting point of PTFE is given, in good agreement with those present in the literature.

📜 SIMILAR VOLUMES

On melt-crystallization of polytetrafluo

On melt-crystallization of polytetrafluoroethylene and of random fluorinated copolymers of tetrafluoroethylene

✍ Rachele Pucciariello; Vincenzo Villani; Claudia Mancusi 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 149 KB 👁 2 views

Through differential scanning calorimetry, isothermal crystallization from the melt of polytetrafluoroethylene (PTFE) has been investigated. PTFE was regarded as one of the polymers for which crystallization is so rapid that the samples crystallize during the cooling from the melt to the selected cr

Phase behavior of crystalline blends of

Phase behavior of crystalline blends of poly(tetrafluoroethylene) and of random fluorinated copolymers of tetrafluoroethylene

✍ Rachele Pucciariello; Carmela Angioletti 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 256 KB 👁 1 views

In the present article, we investigate by differential scanning calorimetry (DSC) the thermal behavior (melting, crystallization, and crystal-crystal transitions) far from equilibrium of blends constituted of two crystalline polymers. In particular, the following blends are examined: PTFE-PFMVE, PTF