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Changes of crystalline structure of poly(ethylene terephthalate) fibers in flame retardant finishing process

100%

Fabia J. , Gawłowski A. , Graczyk T. , Ślusarczyk C.

tom T. 59, nr 7-8

557--561

The poly(ethylene terephthalate) (PET) fibers of improved flammability were investigated. The modification applied to classic PET fibers consisted in a wet flame-retardant treatment of the fabrics during the dyeing process. In this study we took an attempt to describe the supermolecular structure of the flame retardant PET fibers with different content of the modifier as a function of a temperature of the flame retardant finishing process and additionally the structure transformation during the ageing process. To evaluate the crystalline structure of fibers differential scanning calorimetry (DSC) and wide angle X-ray scattering measurements (WAXS) were used.

Przedmiotem badań były włókna z poli(tereftalanu etylenu) (PET) poddane uniepalniającej modyfikacji. Polegała ona na wykańczalniczej kąpieli barwiącej z udziałem określonej ilości substancji ograniczających palność. Opisano wpływ ilości zastosowanego modyfikatora oraz temperatury obróbki na strukturę nadcząsteczkową badanych włókien. Oceniano też zmiany tej struktury w toku starzenia modyfikowanych włókien w warunkach atmosferycznych, w okresie 5 lat. Strukturę krystaliczną uniepalnionych włókien PET charakteryzowano z zastosowaniem metod różnicowej kalorymetrii skaningowej (DSC) oraz szerokokątowej dyfraktometrii rentgenowskiej (WAXS).

Physical and mechanical properties of dune sand mortar reinforced with recycled pet fiber: an experimental study

80%

Ghrieb A. , Abadou Y.

tom Vol. 22, nr 4(74)

41--56

Polyethylene terephthalate is a synthetic material known as PET. PET strapping bands is a material commonly used in all industries for packaging and bundling. The excessive use of this material has led to the pollution of the urban environment, which necessitated the search for effective solutions to dispose of this waste. The treatment and reuse of these materials is among the best solutions that contribute to reducing environmental pollution on the one hand and enabling the obtaining of economical products on the other hand. The main purpose of this experimental study is to valorize dune sand mortar and PET waste in the manufacture of cement mortar. It also aims to investigate the impact of the inclusion of recycled PET fibers on the physical and mechanical properties of the reinforced mortar. The study was carried out in several phases; after a physical and chemical characterization of the materials used, a method for the composition of mixtures was proposed, which is based on the progressive substitution of dune sand by recycled PET fibers. The quantity of cement added to each mixture is fixed at 450 g, and that of dune sand and fibers is taken as equal to 1350 g. In order to properly examine the influence of the incorporation of fibers on the properties of the reinforced mortar, the substitution rate of dune sand by the fibers varied from 0% to 2.5% with a step of 0.5%. For each mixture, many characteristics of the mortar were tested, such as consistency, bulk density, compressive strength, and flexural strength. The results obtained show that the incorporation of PET fibers has a significant effect on the fresh and hardened properties of the treated mortar.