Institute of Biopolymers and Chemical Fibres

Poland

Institute of Biopolymers and Chemical Fibres

Poland
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Wendler F.,Thurlnglan Institute for Textile and Plastics Research | Meister F.,Thurlnglan Institute for Textile and Plastics Research | Wawro D.,Institute of Biopolymers and Chemical Fibres | Wesolowska E.,Institute of Biopolymers and Chemical Fibres | And 5 more authors.
Fibres and Textiles in Eastern Europe | Year: 2010

The aim of the study was to find new structured biopolymer blends bearing adjustable properties able to produce innovative materials. Apart from cellulose and three solvents (NaOH, N-methylmorpholine-N-oxide [NMMO] and 1-ethyl-3-methylimidazolium acetate [EMIMac]), 15 different polysaccharides were chosen to study the interactions ofpolysaccharides or their mixtures in solutions, as well as the solid state after forming. Dissolution screenings yielded promising polysaccharides, which were used for the preparation of cellulose/ polysaccharide solutions and subsequently for the shaping of blends with cellulose. The solubility and miscibility were evaluated by microscopy, DSC, particle analysis and rheology. Polysaccharides with a structure similar to that of cellulose, e.g., xylan, carrageenan or cellulose carbamate were not miscible, showing globular morphologies, whereas high-molar and side chains containing polysaccharides such as xanthan or tragacanth gum form co-continuous morphologies. The forming of blend fibres was nevertheless possible for all three solvents. The textile-physical properties of the blend fibres were slightly decreased compared to those of the unmodified fibre, in which fibres from NMMO and EMIMac had the highest performance. The presence of blended polysaccharides in the fibres produced was verified by residue sugar analysis, in which the highest amounts occurred for EMIMac fibres.


Puchalski M.,University of Lodz | Krucinska I.,University of Lodz | Sulak K.,Institute of Biopolymers and Chemical Fibres | Chrzanowski M.,University of Lodz | Wrzosek H.,University of Lodz
Textile Research Journal | Year: 2013

In this paper the influence of calender temperature on the crystallization behavior of polylactide (PLA) non-woven fabrics during their manufacturing by the spun-bonding technique is described. Non-woven samples were studied by wide-angle X-ray diffraction, differential scanning calorimetry and birefringence. In addition, physical-mechanical properties of the non-woven fabrics were determined. The results are discussed in terms of structural changes of PLA and meso-phase content during the calendering process in the temperature range 70-130°C. The rebuilding of the supermolecular structure of the investigated samples of PLA fabrics under the influence of increasing calender temperature is observed in terms of the disorder-to-order phase transition (ά to α form) during heating around 110°C, and increased degree of crystallinity up to 100°C. The presented structural rebuild of PLA explains observed changes of physical-mechanical properties of the non-woven fabrics obtained at different calendering temperatures. During calendering above 100°C, thermal degradation of PLA occurs at the point of contact between the non-woven fabrics and the calender rollers. © The Author(s) 2013 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.


Krucinska I.,University of Lodz | Gliscinska E.,University of Lodz | Michalak M.,University of Lodz | Ciechanska D.,Institute of Biopolymers and Chemical Fibres | And 2 more authors.
Textile Research Journal | Year: 2015

In this paper studies on sound absorption of the thermoplastic composites on the basis of waste natural fibers are presented. Cotton fibers and cellulose ultra-short and ultra-fine fibers obtained from flax fibers following enzymatic and additional mechanical treatment were used as the components of polylactide composites, and their influence on sound absorption behavior was investigated. The composites were obtained from a pressing process of fibrous multilayer structures. The sound absorption properties of three types of composites were compared: composites reinforced by cotton fibers, composites reinforced by cellulose ultra-short and ultra-fine fibers, and composites reinforced by cotton fibers and cellulose ultra-short and ultra-fine fibers. The role of cellulose ultra-short and ultra-fine fibers in changing the sound absorption properties of composites was determined. It has previously been shown that using natural fibers with a thermoplastic polymer results in increased sound absorption. The best improvement of sound absorption can be obtained by combining cotton fibers and cellulose ultra-short and ultra-fine fibers, especially nanofibers, as a reinforcement. © The Author(s) 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav


Puchalski M.,University of Lodz | Sulak K.,Institute of Biopolymers and Chemical Fibres | Chrzanowski M.,University of Lodz | Sztajnowski S.,University of Lodz | Krucinska I.,University of Lodz
Textile Research Journal | Year: 2015

In this paper, the influence of the take-up velocity (Vt–u) of fibers on the molecular ordering and ά – α form transition of polylactide (PLA) non-woven fabrics during their manufacturing by spun-bonding is described. Non-woven samples were studied by wide-angle X-ray diffraction, differential scanning calorimetry and Fourier transform infrared spectroscopy. In addition, the physical and mechanical properties of the non-woven fabrics were determined. The results are discussed in terms of the structural changes of the PLA and the meso-phase content during the spun-bonded non-woven fabric forming process. This technological process includes preliminary molecular ordering of the PLA fibers in a downstream spinning block and crystallization on a calender system at a temperature higher than the glass transition. The molecular ordering of the investigated PLA fabric samples under different technological conditions was observed as follows: creation of the meso-phase and a disorder-to-order phase transition (ά to α form) during heating to approximately 110℃ and an increase in the degree of crystallinity for take-up velocities higher than 1400 m/min. The structural changes of the PLA explain the observed changes in the physical and mechanical properties of the non-woven fabrics obtained under different technological conditions. © The Author(s) 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

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