Reticulação de compostos poliméricos para recobrimento de superfícies

AUTOR(ES)

Ana Paula Serafini Immich

DATA DE PUBLICAÇÃO

2009

RESUMO

Coating of cotton fiber is employed in the textile industry in order to increase the mechanical resistance of the yarns, that is, resistance to vibration, friction, impact and elongation, which are some of the forces the yarn is subjected during the weaving process. The choice of the coating material is extremely important, since it can provide the best performance during the weaving process. However it must present no harmful effect on the dying process and must be easily removed after the weaving process. The main objective of this study is to investigate the usage of synthetic hydrophilic polymers, poly(N-vinyl-2-pyrrolidone) and poly(vinyl alcohol), to coat 100% cotton textile fiber, aiming to give the fiber a temporary mechanical resistance. In order to improve the mechanical resistance of the fiber, the following crosslinking processes were investigated: UV-C radiation, the Fenton and photo-Fenton reactions, sensitized UV-C radiation and using crosslinking agents, such as, the glutaraldehyde. For each crosslinking process the influence of some parameters were verified, such as: polymer molecular weight; concentration of the polymer solution; drying temperature of the polymer; relative humidity of the environment and UV-C radiation exposure time. The influence of each crosslinking process was determined through tensile testing of the coated fibers. The results indicated that the best crosslinking process employed was UV-C radiation, increasing the mechanical resistance of the yarn up to 74,6% if compared with the pure cotton yarn, that is, without polymeric coating and crosslinking. The oxidative processes used, Fenton and photo-Fenton, were not efficient, decreasing the yarn mechanical resistance. The study of the application of UV-C radiation was of great relevance and despite increasing the mechanical resistance of the yarn it dispensed the use of chemical substances, avoiding the generation of toxic wastes at the end of the process.

ASSUNTO(S)

engenharia quimica fios de algodao polimeros engenharia quimica

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