𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Thermal behaviour and structure of cyanophenoxy copolymers of poly(bis-phenoxyphosphazene)

✍ Scribed by Marian A. Gómez; Carlos Marco; JoséMaGómez Fatou; Gabino A. Carriedo; Francisco J.García Alonso; Paloma Gómez Elipe

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
644 KB
Volume
32
Category
Article
ISSN
0014-3057

No coin nor oath required. For personal study only.

✦ Synopsis

The effect of an increasing amount of cyanophenoxy groups on the thermal behaviour and structure of poly(bis-phenoxyphosphazene) was studied by differential scanning calorimetry, X-ray diffraction and thermo-optical analysis. The thermotropic behaviour was preserved in the copolymers, but the crystallinity and the crystal-liquid crystal transition temperatures were considerably lowered as the content in cyano groups increased. Polymorphic forms existed in the copolymer with 6% of cyano groups, as was the case in poly(bis-phenoxyphosphazene).

The obtained mesophases had the same structure as that observed in the homopolymer.

The kinetics of crystallization from the mesophase were analysed and Avrami exponents of n = 3 and 4 have been found. The temperature at which the mesophase is held prior to crystallization was found to have an important influence on the crystallization process.

📜 SIMILAR VOLUMES

Dilute solution and thermal behaviour of
Dilute solution and thermal behaviour of random poly(butylene isophthalate/terephthalate) copolymers
✍ M Bandiera; A Munari; P Manaresi; M Pizzoli 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 450 KB

Random poly(butylene isophthalate/terephthalate) (PBI/PBT) copolymers of various compositions and different molecular weights were synthesized and characterized by vapour pressure osmometry and viscosity measurements in CHCI 3. The Stockmayer-Fixman procedure was applied to viscometric data in order

Preparation and thermal behaviour of cop
Preparation and thermal behaviour of copolymers from glycidylether and glycidylimide
✍ M. Galià; V. Cádiz; A. Mantecón; A. Serra 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 420 KB

Copolyethers with nadimide or tetrahydrophthalimide derivative pendant groups were prepared by ring-opening polymerization from phenylglycidylether and the corresponding glycidylimide. Elemental analyses led to the compositions of the copolymers which do not closely coincide with the ratio of monome

Thermal Behaviour and Annealing of Poly(
Thermal Behaviour and Annealing of Poly(vinylidene fluoride)
✍ Al-Raheil, Ismail A.; Qudah, Ali M. 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 358 KB 👁 2 views

In this study, we report the melting behaviour of poly(viny1idene fluoride) (PVF,) annealed in a differential scanning calorimeter. PVF, annealed under isothermal conditions often shows double or triple melting endothems depending on the annealing temperature (T,) and the heating rate. The lower mel

Structure and Thermal Behaviour of Methy
Structure and Thermal Behaviour of Methylcyclopentadiene Dimers
✍ Walter Thommen; Hervé Pamingle; Karl H. Schulte-Elte 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 German ⚖ 378 KB

The maximum number ofpossible isomers of A is 36, considering the fact that the three monomers i-iii readily isomerise at 20" via 1,s-H-shifts (equilibration ratio -1:45:54 [5]), and that each monomer may undergo Diels-Alder-type self-and cross-dimerisation.