Preliminary results on the synthesis and characterization of anisotropic networks, oriented on a macroscopic scale, are reported. Fiber samples of segmented thermotropic liq.-cryst. polymers bearing the oxypentenyl lateral substituent have been crosslinked via thermally activated radical reaction. This was made possible by immersion of fiber samples in dichloromethane contg. tert-Bu peroxybenzoate as activating agent, thus allowing its diffusion in the samples. Subsequent annealing at 145°C bring us to an anisotropic network with no loss of the original orientation. A mesophase is stabilized and no structural modification is obsd. by heating samples from room temp. up to 400°C, where thermal decompn. takes place. Cross-linked fibers exhibit good tensile properties, at both room temp. and at 150°C.

Crosslinking of a fibrous sample to a macro-oriented mesomorphic network

DI MAIO, Luciano;IANNELLI, Pio;PRAGLIOLA, Stefania;
1998

Abstract

Preliminary results on the synthesis and characterization of anisotropic networks, oriented on a macroscopic scale, are reported. Fiber samples of segmented thermotropic liq.-cryst. polymers bearing the oxypentenyl lateral substituent have been crosslinked via thermally activated radical reaction. This was made possible by immersion of fiber samples in dichloromethane contg. tert-Bu peroxybenzoate as activating agent, thus allowing its diffusion in the samples. Subsequent annealing at 145°C bring us to an anisotropic network with no loss of the original orientation. A mesophase is stabilized and no structural modification is obsd. by heating samples from room temp. up to 400°C, where thermal decompn. takes place. Cross-linked fibers exhibit good tensile properties, at both room temp. and at 150°C.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/3881119
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