Dependence of the glass transition temperature of poly[N‐(n‐alkyloxy‐carbonyl‐methyl) Maleimides] and poly[N‐(5‐n‐alkyloxycarbonyl‐n‐pentyl) Maleimides] on n‐alkyl side‐chain length

Poly(epichlorohydrin) was modified by nucleophilic substitution with some aliphatic potassium carboxylates containing terminal double bonds (10‐undecenoate, 4‐pentenoate and 3‐butenoate). In order to monitor the degree of substitution achieved, different reaction conditions were tested. The polyethers obtained were characterized by spectroscopic techniques, elemental analysis, thermal methods, viscosity determinations and osmometric measurements. A slight crosslinking and the reported main chain cleavage were both detected. Finally, it must be pointed out that, during the substitution reaction with the vinylacetate, isomerization to crotonic ester took place.

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Chemical modification of poly(epichlorohydrin) with unsaturated potassium carboxylates

Reina

Cádiz

Mantecón

et al. 1993

Angew. Makromol. Chem.

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Effect of side chain length on the glass transition of copolymers from styrene with n‐alkyl citraconimides and with n‐alkyl itaconimides

1990

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Equimolar copolymers of styrene with a series of N-n-alkyl citraconimides where the alkyl group varies from methyl to octadecyl were synthesised and the dependence of the glass transition on the length of the alkyl chain examined. Over the series N-methyl to N-n-octadecyl only a smooth monotonic decrease in the value of the glass transition temperature r, was found. Any increase in r, at high alkyl chain lengths that might arise from ordering effects was not detected. However, by viewing the copolymer structure as comprising a main chain unit and a series of methylene side chain units of varying length, then plotting the data according to the Gordon-Taylor equation, a deviation from linearity is revealed that may be interpreted as due to incipient crystallisation of the longer side chains.A similar examination of a series of copolymers of styrene with N-n-alkyl itaconimides proved impracticable due to the inability to prepare isomerically pure itaconimide monomers. Comparisons of the citraconimide series were thus drawn with literature data on copolymers of styrene with N-alkyl maleimides.

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Crosslinking study of polyethers containing pendent double bonds

Reina

Serra

Mantecón

et al. 1995

J. Polym. Sci. A Polym. Chem.

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This article studies the crosslinking reactions of some polyethers containing double bonds on the side chains. Thermal crosslinking takes place in all cases, but is overlapped by the degradation process. So, a catalyst has to be used to obtain the cured material and avoid degradation. The best initiator appears to be dicumyl peroxide and the maximum cross‐linking degree is achieved only with 5% (w/w). Thermogravimetric analyses are used to test the quality of the cured materials. IR spectroscopy shows that crosslinking actually takes place by polymerizing pendent double bonds. Furthermore, activation energies for thermal and radical initiated crosslinking are determined by means of dynamic DSC studies. © 1995 John Wiley & Sons, Inc.

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Dependence of the glass transition temperature of poly[N‐(n‐alkyloxy‐carbonyl‐methyl) Maleimides] and poly[N‐(5‐n‐alkyloxycarbonyl‐n‐pentyl) Maleimides] on n‐alkyl side‐chain length

Cited by 5 publications

References 35 publications

Chemical modification of poly(epichlorohydrin) with unsaturated potassium carboxylates

Chemical modification of poly(epichlorohydrin) with unsaturated potassium carboxylates

Effect of side chain length on the glass transition of copolymers from styrene with n‐alkyl citraconimides and with n‐alkyl itaconimides

Crosslinking study of polyethers containing pendent double bonds

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