A study on the functional properties of silk and polyester / lyocell mixed fabric

ABSTRACT Silk is one of the valuable fibers in textile industry. It is used for delicate applications in many areas such as sarees, suitings, curtains and luxurious interiors. To diversify the properties and usages silk is mixed with polyester and lyocell. The fabric is dyed with natural dyes (kum kum, indigo, barberry) as well as synthetic dyes (reactive dye (H), reactive dye (M) and sulphur dye). This mixed fabric is compared with 100% silk for some of the basic properties like absorbency, water retention, wicking, water vapour permeability, air permeability, K/S values, colour fastness and antimicrobial property. The silk mixed fabric gives the appreciable results with the 100% silk fabric

Effect of acid modification on dyeing properties of Rajshahi silk fabric with different dye classes

In this paper, Rajshahi silk fabric was modified by acetic acid, tannic acid and their mixture. After acid modification, the silk fabric was dyed with three dyes classes namely: Reactive Orange 14, Direct Yellow 29 and Mordant Blue 9. Results revealed that the fabric modified with acid mixture of 30 acetic acid and 20 tannic acid improved the colorfastness of the dyed fabric after 7 days exposure on simulated sunlight and washing with hot soap solution. Also, the acid modification could improve the dyed fabrics' colorfastness properties to acids and alkalis. Optimum dyeing condition was observed at 1.5, 2.0, and 2.0 dyes for Reactive Orange 14, Direct Yellow 29 and Mordant Blue 9 respectively. The optimum dyeing time was observed 50, 60, and 50 min; and temperature was 90, 100 and 80 °C respectively. Modification of silk fabrics with acids improves the dyeability and colorfastness of Rajshahi silk fabrics. However, the acid modification could reduce the loss in tenacity of silk fabric upon exposure to sunlight

Fiber length, thermal, mechanical, and dynamic mechanical properties of injection-molded glass-fiber/polyamide 6,6: Plasticization effect

Unreinforced- and glass fiber-reinforced-polyamide 6,6 specimens were subjected to dry, 50 RH, and wet conditions. FLD study showed that more fiber degradation occurred during processing of the composites with higher fiber loading. TGA results revealed that about 2 and 5 levels of moisture have been absorbed by the specimens subjected to 50 RH and wet conditions, respectively. From DSC results, with moisture uptake, there were no significance changes in the melting temperature, crystallization temperature, and enthalpy of crystalline; however, degree of crystallinity and enthalpy of melting decreased. Tensile strength, tensile modulus, flexural strength, and flexural modulus decreased with moisture uptake, while tensile strain and flexural displacement increased. DMA study showed that tan delta at room temperature and tan delta maxima increased with moisture absorption, while temperatures at maximum tan delta in α-and β-transition regions decreased

Synthesis and characterization new Polymerizable Liquid Crystal Monomer and its atom transfer Radical Polymerization for novel side chain Liquid Crystalline Polymers

We synthesized a new polymerizable liquid crystal (LC) monomer, which contain naphthalene ring in the mesogen. The new LC monomer was characterized by IH NMR, Polarized Optical Microscope (POM), Differential Scanning Calorimeter (DSC) and Wide Angle X-ray Diffractometer (WAXD) measurements. Living Atom Transfer Radical Polymerization (ATPR) was used to synthesize side chain liquid crystalline p,0lymers (SCLCPs) of different molecular weight. The SCLCPs were characterized by H NMR, Gel Permeation Chromatogram (GPC), POM, DSC and WAXD. The SCLCPs showed isotropization at 179°C, a very wide range nematic phage appeared from 177-117 0C temperature region and smetic A phage appeared at or below 117°C. The glass transition temperature (Tg) was increased with the increase of molecular weight (Mn) of SCLCPs

Interfacial shear strength and tensile properties of injection-molded, short- and long-glass fiber-reinforced polyamide 6,6 composites

Injection-molded short- and long-glass fiber/polyamide 6,6 composites were subjected to tensile tests. To measure the effectiveness of the fibers in reinforcing the composites, a computational approach was employed to compute the fiber-matrix ISS, orientation factor, reinforcement efficiency, tensile-, and fiber length-related properties. Although the LFCs showed great improvement in fiber characteristics compared to the SFCs, enhancement in tensile properties was small, which is believed to be due to the larger fiber diameter. Kelly-Tyson model provides good approximation for the computation of ISS and tensile-related properties