𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Radiation-induced copolymerization of tetrafluoroethylene and 3,3,4,4,5,5,5-heptafluoropentene-1 under pressure

✍ Scribed by Brown, Daniel W. ;Lowry, Robert E. ;Wall, Leo A.

Publisher
Wiley (John Wiley & Sons)
Year
1970
Tongue
English
Weight
606 KB
Volume
8
Category
Article
ISSN
0449-296X

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

An investigation was made of the γ‐ray‐induced copolymerization of tetrafluoroethylene and 3,3,4,4,5,5,5‐heptafluoropentene‐1. At 22°C at 5000 and 10 000 atm the polymerization rate changes little between 0 and 75 mole‐% tetrafluoroethylene. Above 90 mole‐% the rate increases greatly. Molecular weights vary with composition in a fashion similar to the variation of the rates. Crystallization occurs in the bulk pentene at 13 500 atm at 24°C. The polymerization rate is very low in the solid state. Under some conditions polymerization continues long after irradiation is ended. Both reactivity ratios favor the pentene. Several copolymer properties were studied. The polymers are amorphous and soluble in perfluoro ethers, perfluoro alkanes, and perfluoroaromatics if they contain less than 80% tetrafluoroethylene. The glass temperatures of the amorphous polymers decrease and the thermal and radiation stability increases as the tetrafluoroethylene content increases.

📜 SIMILAR VOLUMES

Radiation-induced polymerization of 3,3,
Radiation-induced polymerization of 3,3,4,4,5,5,5-heptafluoropentene-1 at high pressure
✍ Brown, Daniel W. ;Lowry, Robert E. ;Wall, Leo A. 📂 Article 📅 1970 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 507 KB

## Abstract A study was made of the radiation‐induced polymerization under pressure of 3,3,4,4,5,5,5‐heptafluoropentene‐1. Polymerization rates increase with pressure (activation volume equals − 11 cc/mole) and temperature (activation enthalpy equals 6.5 kcal/mole) in liquid phase. At 13800 atm and

Synthesis of 2,4,5-triaryl-5H-chromeno[4
Synthesis of 2,4,5-triaryl-5H-chromeno[4,3-b]pyridines under microwave radiation
✍ Hui Wu; Yu Wan; Xiu-Mei Chen; Cai-Fa Chen; Lei-Lei Lu; Hai-Qiang Xin; Hua-Hong X 📂 Article 📅 2009 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 275 KB

## Abstract magnified image 2,4,5‐Triaryl‐5__H__‐chromeno[4,3‐__b__]pyridines were synthesized from a three‐component cascade reaction of 2′‐hydroxyacetophenone, aromatic aldehyde, and ammonium acetate catalyzed by 2‐1′‐methylimidazolium‐3‐yl‐1‐ethyl sulfate under microwave irradiation. Nine new b

Synthesis of new heteroaromatic nitrogen
Synthesis of new heteroaromatic nitrogen ligands: Pyrimido-[4″,5″:4′,5′]-thieno[3′,2′:4,5]thieno[3,2-d]pyrimidines and 1,2,3-triazine[4″,5″:4′,5′]thieno[3′,2′:4,5]thieno[3,2-d]-1,2,3-triazines
✍ Gerardo Blanco; José M. Quintela; Carlos Peinador 📂 Article 📅 2006 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 126 KB 👁 1 views

## Abstract magnified image An efficient one‐pot access for the synthesis of the previously unreported tetracyclic fused pyrimido‐[4″,5″:4′,5′]thieno[3′,2′:4,5]thieno[3,2‐__d__]pyrimidine (**3**) and 1,2,3‐triazine[4″,5″:4′,5′]thieno‐[3′,2′:4,5]thieno‐[3,2‐__d__]‐1,2,3‐triazine (**5**) heteroaroma