𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Influence of the Composition on Crystal Phase and Thermal Behavior of trans-1,4-Butadiene/Isoprene Copolymers

✍ Scribed by Fabio Bertini; Maurizio Canetti; Giovanni Ricci

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
245 KB
Volume
208
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Butadiene/isoprene copolymers were prepared using the catalyst system V(acac)~3~‐MAO. The structure of the comonomers is trans‐1,4 and the butadiene and isoprene units are statistically distributed along the polymer chain. The attitude of the butadiene sequences to crystallize in the monoclinic form and to evolve in the hexagonal form is preserved in the copolymer for a certain range of composition. The temperature interval between the two endothermic events is progressively reduced by increasing the isoprene content. The monoclinic/hexagonal transition produces a considerable increase in the lamellar thickness of the polymers. Thermal degradation of the copolymers is influenced by the composition and takes place in two different stages: a series of cyclization and cross‐linking reactions occur before the decomposition step.

magnified image

📜 SIMILAR VOLUMES

Side-chain liquid crystal copolymers con
Side-chain liquid crystal copolymers containing nonmesogenic units: Dependence of the thermal behavior upon composition
✍ Aileen A. Craig; Corrie T. Imrie 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 570 KB

The reactivity ratios have been determined for a mesogenic/nonmesogenic comonomer system, namely 5-[4-(4'-methoxyphenyl)phenoxy]pentyl methacrylate/methyl methacrylate. The reactivity ratios were found to be equal and approximately unity. The copolymerization is, therefore, azeotropic and the result

Effect of diluents on the crystallizatio
Effect of diluents on the crystallization behavior of poly(4-methyl-1-pentene) and membrane morphology via thermally induced phase separation
✍ Haijun Tao; Jun Zhang; Xiaolin Wang 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 349 KB 👁 2 views

## Abstract The effect of diluents on polymer crystallization and membrane morphology via thermally induced phase separation(TIPS) were studied by changing the composition of the mixed‐diluents systematically, in the system of poly(4‐methyl‐1‐pentene) (TPX)/dibutyl‐phthalate (DBP)/di‐__n__‐octyl‐ph

Influence of Molecular Structure and Ste
Influence of Molecular Structure and Stereochemistry of the 1,4-Cyclohexylene Ring on Thermal and Mechanical Behavior of Poly(butylene 1,4-cyclohexanedicarboxylate)
✍ Corrado Berti; Annamaria Celli; Paola Marchese; Elisabetta Marianucci; Giancarlo 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 256 KB

## Abstract Poly(butylene 1,4‐cyclohexanedicarboxylate), an aliphatic polyester with favorable properties, such as resistance to weather and potential biodegradability, has been synthesized with different __cis/trans__ ratio of the 1,4‐cyclohexylene ring. The samples show high degradation temperatu