𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Transesterification in homogeneous poly(ε-caprolactone)–epoxy blends

✍ Scribed by Jyh-Luen Chen; Hui-Min Huang; Ming-Shiu Li; Feng-Chih Chang

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
217 KB
Volume
71
Category
Article
ISSN
0021-8995

No coin nor oath required. For personal study only.

✦ Synopsis

Transesterification has been investigated in poly(-caprolactone) (PCL)epoxy blends. In the hot melt process, the hydroxyl on diglycidyl ether of bisphenol-A (DGEBA) monomers is too low to give a noticeable transesterification reaction. In the postcure process, model reactions reveal that the hydroxyls from a ring-opening reaction are able to react with the esters of PCL. In the meantime, the PCL molecular weight decrease and its distribution becomes broader. Nuclear magnetic resonance spectra reveal that fraction of the tertiary hydroxyls converts to secondary hydroxyls. In the cured DGEBA-3,3Ј-dimethylmethylene-di(cyclohexylamine)-PCL blend, a homogeneous morphology is achieved. PCL segments are grafted onto the epoxy network after postcuring and result in the lower T g observed in the differential scanning calorimetry thermogram. A higher transesterification extent also results in broader transition peaks by dynamic mechanical analysis.

📜 SIMILAR VOLUMES

Ternary Thermosetting Blends of Epoxy Re
Ternary Thermosetting Blends of Epoxy Resin, Poly(ethylene oxide) and Poly(ε-caprolactone)
✍ Minghua Yin; Sixun Zheng 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 341 KB

## Abstract **Summary:** The ternary thermosetting blends composed of epoxy resin, poly(ethylene oxide) (PEO) and poly(__ε__‐caprolactone) (PCL) were prepared via in situ polymerization of epoxy monomers in the presence of the two crystalline polymers, PEO and PCL. DSC results showed that the binar

Polyester–Polycarbonate blends. IV. Poly
Polyester–Polycarbonate blends. IV. Poly(ε-caprolactone)
✍ C. A. Cruz; D. R. Paul; J. W. Barlow 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 696 KB

## Abstract Polycarbonate blends with poly(ε‐caprolactone) were prepared by both melt‐blending and solution‐blending techniques, and the properties of these blends were studied by thermal analytical and dynamic mechanical testing methods. Each blend composition was found to have a single glass tran

Use of modified poly(ϵ-caprolactone) in
Use of modified poly(ϵ-caprolactone) in the compatibilization of poly(ϵ-caprolactone)/maize starch blends
✍ C. Pascente; L. Márquez; V. Balsamo; A. J. Müller 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 805 KB

## Abstract In this work, the compatibilization of a poly(ϵ‐caprolactone) with a number‐average molecular weight of 120,000 g/mol (PCL^120^) and maize starch was investigated by the addition of a chemically modified poly(ϵ‐caprolactone). Two types of blends were prepared by melt extrusion. In type

Influence of thermal stabilizers on diff
Influence of thermal stabilizers on diffusion of poly(ϵ-caprolactone) in poly(vinyl chloride)/poly(ϵ-caprolactone) blends
✍ Marie-Odile David; Robert E. Prud'Homme 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 555 KB

The influence of thermal stabilizers on the poly(s-caprolactone) (PCL) diffusion in poly(viny1 chloride) (PVC)/PCL blends was studied with the addition of various concentrations of dibasic lead phthalate and dibutyltin dilaurate. The rate of PCL diffusion was followed by differential scanning calori