http://www.mtdna.or.kr/neowiz/board/up_files/files_17/Chitin_Chitosan_polymers_chemistrySolubilityFiberFormation.pdf

Chitin and chitosan polymers: Chemistry, solubility and fiber formation

The growing ecological and environmental consciousness has driven efforts for development of new innovative materials for various end-use applications. Polymers synthesized from natural resources, have gained considerable research interest in the recent years. This review paper is intended to provide a brief outline of work that covers in the area of biocomposites, major class of biodegradable polymers, natural fibres, as well as their manufacturing techniques and properties has been highlighted. Various surface modification methods were incorporated to improve the fibre–matrix adhesion resulting in the enhancement of mechanical properties of the biocomposites. Moreover, an economical impact and future direction of these materials has been critically reviewed. This review concludes that the biocomposites form one of the emerging areas in polymer science that gain attention for use in various applications ranging from automobile to the building industries.

A review of the recent developments in biocomposites based on natural fibres and their application perspectives

Composites science and technology

Fourier Transform Infrared Spectroscopy: Applications to Chemical Systems Vol 1 Edited by J R Ferraro and L J Basile Pp 311 (Academic: New York, San Francisco and London, 1978) $25; £1625

Fourier transform infrared spectroscopy

Fused deposition modeling-based additive manufacturing (3D printing): techniques for polymer material systems

In this paper, the influence of the various degradation conditions, on the molecular and supramolecular structure of polybutylene succinate (PBS) and polybutylene succinate adipate (PBSA) copolymer during degradation is described. The experiment was carried out by the use of injection molded samples and normalized conditions of biodegradation in soil, composting and artificial weathering. Materials were studied by size-exclusion chromatography (SEC) coupled with multiangle laser light scattering (MALLS) detection and wide-angle X-ray diffraction (WAXD). Additionally, the physical and mechanical properties of the samples were determined. The performed experiments clearly show difference impacts of the selected degradation conditions on the macroscopic, supramolecular and molecular parameters of the studied aliphatic polyesters. The structural changes in PBS and PBSA explain the observed changes in the physical and mechanical properties of the obtained injection molded samples.

https://www.mdpi.com/2073-4360/10/3/251/pdf

Molecular and Supramolecular Changes in Polybutylene Succinate (PBS) and Polybutylene Succinate Adipate (PBSA) Copolymer during Degradation in Various Environmental Conditions

Technical University of Lodz Faculty of Material Technologies and Textile Design Department of Fibres Physics and Textile Metrology, Center of Advanced Technology Pro Humano Tex ul. Żeromskiego 116, 90924 Łodź, Poland E-mail: symon@p.lodz.pl Abstract Bamboo fi bres are gaining more and more attention on the world market. Producers claim that their products are made from natural, ecological material of many exceptional properties characteristic for natural bamboo fi bres. There are many obscurities involving bamboo fi bres, which lead potential clients to misunderstandings. In the world a campaign is underway to reveal the truth behind these questionable fi bres. In this paper, the authors try to prove, by scientifi c means, that so-called bamboo fi bres are in reality man-made viscose fi bres made from bamboo cellulose.

/pdf/new-commercial-fibres-called-bamboo-fibres-their-structure-2eo2qyl8x9.pdf

New Commercial Fibres Called 'Bamboo Fibres' - Their Structure and Properties

Oxidation of cellulosic materials is required in many fields such as textile processing, natural fiber composites, medical utilization, and so on. The present study was designed to explore the possibility of ozone treatment as a greener oxidation process for jute fibers. Ozone gas was used for the treatment of waste jute fibers for different time periods in a humid atmosphere. Several characterization techniques, namely physical appearance, fiber mechanical properties, the copper number, Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, scanning electron microscopy, moisture regain percentage and lightness values (L), were used to assess the effect of treatment on jute fibers. Results showed that fiber tensile properties weaken gradually as a function of treatment time, and surface functional groups alter accordingly. Changes in crystallinity after ozone treatment were also observed. Physically the fiber bundles were split into brittle single fibers, and the L value increased from a brownish shade to lighter color.

Ozone treatment of jute fibers

In this work, a multifunctional polymer composite is made using melt-blowing technology from polypropylene (88 wt.%) and poly (ethylene terephthalate) (12 wt.%) with the addition of functional modifiers, that is, 3 g of a superabsorbent polymer and 5 g of a biocidal agent (Biohaloysite). The use of modifiers is aimed at obtaining adequate comfort when using the target respiratory protection equipment (RPE) in terms of microclimate in the breathing zone and protection against harmful aerosols including bioaerosols. The developed production method is innovative in that the two powdered modifiers are simultaneously applied in the stream of elementary polymeric fibers by two independent injection systems. Aerosols of the modifiers are supplied via a specially designed channel in the central segment of the die assembly, reducing the amount of materials used in the production process and saving energy. The results show that the proposed method of incorporating additives into the fiber structure did not adversely affect the protective and functional properties of the resulting filtration nonwovens. The produced nonwoven composites are characterized by SEM, FTIR, and differential scanning calorimetry (DSC). Given their high filtration efficiency at 5%, satisfactory airflow resistance (~200 Pa), very good antimicrobial activity, and excellent water absorption capacity, the obtained multifunctional nonwoven composites may be successfully used in filtering respiratory protective devices.

/pdf/multifunctional-polymer-composites-produced-by-melt-blown-22xtb867re.pdf

Multifunctional Polymer Composites Produced by Melt-Blown Technique to Use in Filtering Respiratory Protective Devices.

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...

Sławomir Sztajnowski

Papers

Molecular and Supramolecular Changes in Polybutylene Succinate (PBS) and Polybutylene Succinate Adipate (PBSA) Copolymer during Degradation in Various Environmental Conditions

New Commercial Fibres Called 'Bamboo Fibres' - Their Structure and Properties

Ozone treatment of jute fibers

Multifunctional Polymer Composites Produced by Melt-Blown Technique to Use in Filtering Respiratory Protective Devices.

Effect of processing variables on the thermal and physical properties of poly(L-lactide) spun bond fabrics: