Studies on Saponified Vinyl Acetate - Crotonic Acid Copolymers.

Non-isothermal crystallization and melting of ethylene-vinyl acetate copolymers with different vinyl acetate contents

Non-isothermal crystallization and subsequent melting of three grades of ethylene-vinyl acetate copolymer were investigated by differential scanning calorimetry (DSC) technique. The DSC crystallization curves show that vinyl acetate (VAc) content has the same effect on the onset, peak and final crystallization temperatures, and these copolymers have almost the same spacing of thermal windows un...

Vinyl Acetate

Poly(acrylic acid)–Poly(vinyl alcohol) Copolymers with Superabsorbent Properties

Biodegradable polyacrylates were produced by a series of novel copolymerization and/or crosslinking techniques using poly(vinyl alcohol) (PVA) moieties modified by the incorporation of olefinic structures. PVA was modified by a tosylation and/or detosylation reaction. The functionalized PVA was copolymerized and/or crosslinked with acrylic acid or its partially neutralized form to give crosslin...

Micro structure determination of Af-vinylcarbazole/vinyl acetate copolymers by one- and two-dimensional NMR spectroscopy

The copolymers of iV-vinylcarbazole/vinyl acetate (V/A) of different compositions were prepared by solution polymerization using AIBN as an initiator. The copolymer composition was determined from quantitative "Cf'H} NMR spectroscopy. Reactivity ratios for the comonomers were calculated using the Kelen-Tudos (KT) and non-linear error in variable (EVM) methods. Two-dimensional heteronuclear sing...

Studies of the Reaction of Various 1,2-Disubstituted Benzenes with Crotonic Acid in Polyphosphoric Acid

H a m i s h G . G r a n t * Department o f Organic Chemistry, University o f Adelaide G . P . O . B o x 498, South Australia 5001 Z. Naturforsch. 34b , 728-733 (1979); received N o v e m b e r 27, 1978 5,6-Disubstituted Indanl -ones , Crotonic Ac id , Po lyphosphor i c Ac id , 1-Methyl Benzofurocyc lopentan-3-one, 1 3C N M R The reaction of several 1,2-disubstituted benzenes with crotonic acid ...