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Alkali dissolution behaviour of sea–island‐type polyethylene terephthalate ultramicrofibre knitted fabrics
Author(s) -
Kim Hyun Sung,
Shin Eun Suk,
Lee Jung Jin
Publication year - 2014
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/cote.12105
Subject(s) - alkali metal , polyethylene terephthalate , dissolution , sodium hydroxide , cationic polymerization , materials science , polyethylene , scanning electron microscope , differential scanning calorimetry , chemical engineering , nuclear chemistry , composite material , chemistry , polymer chemistry , organic chemistry , physics , engineering , thermodynamics
Sea–island‐type polyethylene terephthalate ultramicrofibre (0.007 denier per filament) with a single fibre diameter of ca . 800 nm has been produced over the last 4 years. Three kinds of sea–island‐type polyethylene terephthalate knitted fabric manufactured from this ultramicrofibre were alkali treated, and their dissolution behaviour was investigated. It was found that the dissolution ratio was dependent upon temperature and sodium hydroxide concentration in the alkali treatment. Practical dissolution ratios mostly reached the theoretical values after alkali treatment with 1.0% (w/w) sodium hydroxide solution at 95 °C for 40 min in all samples. Alkali dissolution of the sea component and revealing of the island component were confirmed by differential scanning calorimetry and scanning electron microscopy. Alkali dissolution behaviour could also be monitored indirectly by the cationic dye staining method. While all untreated samples exhibited high colour yield values after cationic dyeing, alkali‐treated samples showed reduced colour yield values with increasing alkali treatment time and a final levelling‐off point.