Tensile behavior of polyester yarns modified by trichloroacetic acid-methylene chloride treatment

Abstract

SYNOPSISThe effect of trichloroacetic acid-methylene chloride (TCAMC) solvent system on the mechanical properties of poly(ethy1ene terephtha1ate)-based flat, high twist, and spun yarns were studied. Pretreatments were carried out in an unrestrained state at different concentrations for various times and without employing any heat treatment. The stress-strain behavior of yarns was analyzed. The stress-strain curves showed that the treated yarns exhibit different morphologies. A significant plastic flow region could be detected in treated yarns. The higher interaction between the reagent and the polyester revealed the closeness of their solubility parameter values. Structural modification of yarns due to TCAMC treatment led to an increase in elongation without significant reduction in strength. The reagent caused reduction in initial modulus, yield stress, and an increase in work of rupture. The increase in work of rupture was higher in flat yarn but not appreciable in the other two yarns. Statistical analysis of the test data was done.

Solvent‐induced modifications in polyester yarns. I. Mechanical properties

“…Besides highly elastic material and crystalline solids, there are certain polymers which can undergo large‐scale deformation without significant fracture up to certain level, but do not completely return to their original length upon the removal of stress. However, they show elastic behavior at smaller strains at the Hookean region 25. This behavior is observed in the stress–strain curves of the FFP and MDP yarns treated with the TCAC reagent.…”

A solvent induced crystallisation method to imbue bioactive ingredients of neem oil into the compact structure of poly (ethylene terephthalate) polyester

“…According to the solubility parameter theory it has been established [33,34] that highly interacting solvents, after diffusion into the polymer structure, promote crystallisation, re-crystallisation of the molecules and increase their segmental mobility so that structural modifications take place. It will be mentioned that PET Table 2 that there is no appreciable increase in X-ray crystallinity at lower concentration of 1% and 3% TCAMC treatment.…”

Interaction of a non-aqueous solvent system on bamboo, cotton, polyester and their blends: the effect on abrasive wear resistance

“…4). Previous research has also shown that such treatments increase the cohesion between fibres [17,18].…”

“…One approach that has been explored to a considerable extent is the structural modification of regular polymeric fibres making use of highly interacting solvents. It has been demonstrated that the interacting power of Trichloroacetic acid-methylene chloride (TCAMC) solvent system with Polyethylene terephthalate (PET) is very high and the regent attacks the polymer matrix, disintegrates and finally dissolves out the PET at about 25% (w/v) concentration in 5 minutes at room temperature condition [17][18][19][20][21]. It is expected that at certain lower concentration of TCAMC treatment, the compact structure of PET opens up and as a result, molecular rearrangements may take place.…”

“…Accordingly it can be explained that the solubility parameter of TCAMC reagent is very close to the solubility parameter of PET. It was hypothesised that at certain lower concentrations of TCAMC treatment the compact structure of polyester opens up [17][18][19][20][21]. The effect of TCAMC on cellulosics such as cotton yarns were published elsewhere [11].…”