Study on Shape Memory Property of PTT and PTT Interwoven Fabric
|Keywords||PTT shape memory fabric radian plasticity force stimulating crease recovery simulating hand-touch test testing evaluation method structure parameter|
PTT“shape memory fabric”is a light and dense fabric developed in recent years, which has similar fabric appearance to blended fabric of metal fibers. PTT“shape memory fabric”has excellent“radian plasticity”and“crease recovery”after mechanical stimulus. The former can make the fabrics be shaped at your needs by hands, and the later make wrinkle which was formed in wearing and storing be easily removed. Widely speaking, the fabrics’character belonged to the definition of the shape memory materials.At present, there is not standard objective testing evaluation criteria about the two outstanding properties of PTT“shape memory fabric”. In this thesis, according to the characteristics of PTT“shape memory fabric”, objective evaluation methods for its“radian plasticity”and force stimulus“crease recovery”were designed, which could resolve the merit ranking of PTT category“shape memory”fabric in the textile products market; the shape memory property of PTT type fabrics with different material and structure parameters were also deeply studied in this paper. The main research methods, results and conclusions were as follows:(1) In the evaluation of fabric“radian plasticity”property, concavo-convex curved shapes were produced by a self-made arc shaping device, and arc height H was used for characterizing the radian plasticity of fabrics. The results showed that the arc height H of different wearing fabrics had a significant difference. It is proved that the evaluation of fabric“radian plasticity”established in this thesis can evaluating the“radian plasticity”of fabrics effectually.(2) In the evaluation of fabric’s force stimulating“crease recovery”property, firstly, a force stimulating device which is used for simulating hand-touch fabric was developed; secondly, two evaluating methods were established, one is using fabric crease recovery angle to characterize the crease recovery ratio, the other is using fabric crease recovery length to characterize the crease recovery ratio. The results showed that both of the two evaluating methods were practicable. But the testing results characterized by the fabric crease recovery length were higher than the results characterized by the fabric crease recovery angel.(3) The effect of materials to the“radian plasticity”and force stimulating“crease recovery”of PTT, PTT×PET and PET“shape memory”fabrics was discussed. In category of light, high tight fabrics, the results showed that PTT“shape memory”fabrics’“radian plasticity”and force stimulating“crease recovery”were better than other two kinds of fabrics; PTT×PET“half-shape memory”fabrics took second place; PET“imitation shape memory”fabrics’shape memory property was the worst.(4) The effect of structural parameters to the“radian plasticity”and force stimulation“crease recovery”of PTT category“shape memory”fabric was analyzed deeply. 18 kinds of PTT category“shape memory”fabrics which have emerged on the current market were collected. Seven structure parameters were chosen to explore their influence to the“radian plasticity”and force stimulating“crease recovery”. Firstly the single-element method was used to hunt for the main parameters which affect the two characters of PTT“shape memory”fabrics, then the experimental data affecting the“radian plasticity”and“crease recovery”were respectively analyzed by stepwise-regression method to find out the main factors among the seven factors, and their effect on the characters was analyzed. What’s more, the influence of structure parameters to the“radian plasticity”and“crease recovery”for PTT×PET intertexture and PET fabric was primarily analyzed.