Surface hydrolysis of filaments based on poly(trimethylene terephthalate) spun at high spinning speeds

Abstract

ABSTRACT:The surface alkaline hydrolysis of fibers made from poly(trimethylene terephthalate) (PTT) was studied after extruding the polymer at high spinning speeds from 2000 to 6000 m/min and heat setting in the range of temperatures from 100 to 180°C. Fiber weight loss increased with an increasing heat-setting temperature but it was also dependent on the spinning speed. Some of the partially hydrolyzed fibers had a well-developed, hydrophilic surface, and pore size in the range of 0.69 to 1.20 m. The optimum reaction and morphological conditions for increasing porosity in PTT fibers depends on spinning speed and heat-setting temperature. A temperature of 180°C is the upper limit for heat-setting PTT filaments but seems to be the most effective for making porous fibers.

New functional bicomponent fibers with core/sheath‐configuration using poly(phenylene sulfide) and poly(ethylene terephthalate)

“…Bicomponent fibers with PET in the sheath showed significant changes in weight and surface structure, as expected. Interestingly, the measured weight losses between 5.2% and 9.4% are relatively small in comparison with the observed weight losses during hydrolysis of other polyesters like poly(trimethylene terephthalate) (PTT)25 and poly(butylene terephthalate) (PBT) 16. Kotek and Zeronian reported on weight losses larger than 15%, strongly depending on spinning speed and hydrolysis time 16, 25.…”

“…Interestingly, the measured weight losses between 5.2% and 9.4% are relatively small in comparison with the observed weight losses during hydrolysis of other polyesters like poly(trimethylene terephthalate) (PTT)25 and poly(butylene terephthalate) (PBT) 16. Kotek and Zeronian reported on weight losses larger than 15%, strongly depending on spinning speed and hydrolysis time 16, 25. The difference in weight loss between the NaOH and KOH can be explained by the higher concentration of the NaOH solution and, presumably, by the better mobility of the smaller Na + ‐ions into the pores of the PET‐sheath.…”

“…Increased humidity in the raw materials after drying could lead to degradation. The handbook value for typical moisture contents after drying PPS and PET are 0.008% and 0.004%,2, 25 whereas the measured moisture content for PPS and PET was 0.005% and 0.022%, respectively. The high moisture content in the PET pellets would likely induce partial hydrolysis.…”

“…In general PET is resistant to chemical attacks, but the ester linkage in the PET molecular chain can be attacked by some reagents such as acids or aqueous alkaline solution. Sodium hydroxide removes successive layers from the polymer fiber surface through chain scission and renders the surface more hydrophilic 25. Therefore protection against hydrolysis might be an important issue.…”

Poli (trimetilen Tereftalat) Lifleri Bölüm 1: Üretimi, Özellikleri, Kullanım Alanları, Çevresel Etkisi

“…Poliester liflerinin eriyikten lif çekimi yöntemine göre oluşturulması esnasında lifin dış bölgelerinin lifin iç kısımlarına nazaran çok daha hızlı soğumasından dolayı lif kabuk-öz morfolojisinde farklılıklar oluşabilmektedir. Lifin enine kesitindeki bu farklı morfolojinin, poliesterin boyama karakteristiklerini ve poliester lifinin alkali hidrolizini etkileyeceği tahmin edilmektedir [17]. PTT lifinin yüzey morfolojisi üzerindeki etkisi [19] Wu ve arkadaşları [20], PTT'yi 500-8000 m/dak arasındaki lif çekim işlemi hızlarında eriyikten lif çekimi yöntemi ile çekerek çeşitli lif örnekleri hazırlamıştır.…”