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Effect of the Surface modification of Cellulose nanofibers on the Mechanical Properties and Disintegrability of Specific PLA/Cellulose Composites

Wietecha Justyna, Kazimierczak Janusz, Jeziorna Agata

Fibres & Textiles in Eastern Europe

2023

Vol. 31, no. 6

15--29

PLA/nanofibrillar cellulose (NFC) composite films were produced by solution casting. Before use, the cellulose fibers were modified with various types of surface active agents – cationic, anionic and non-ionic surfactants. The structure and morphology of samples of the cellulose fillers and composite films with polymer were analyzed by means of scanning electron microscopy and PXRD diffraction. Thermal parameters of the composite films were characterized by differential scanning calorimetry and thermogravimetric analysis. The tensile strength and elongation at break of the films were evaluated in mechanical tests. The ability to disintegrate of all PLA/NFC composites under composting conditions was also determined and compared.

The effect of basalt knitted fabric on the properties of green epoxy resin

Jamshaid Hafsa, Rajput Abdul Waqar, Zahid Bilal, Memon Sanam, Qureshi Raja Fahad, Aslam Sarmad, Nadeem Muhammad

Polimery

2022

Vol. 67, nr 2

67--71

The influence of basalt fabric on the tensile mechanical properties and the impact resistance of green epoxy resin was investigated. Composites with parallel arrangement of insert yarns had better properties than in the case of their perpendicular arrangement. The properties were also influenced by the number of layers of the fabric. The tensile strength and impact resistance of the composites were better than the commercially available side mirror covers due to the superior properties of the basalt fiber.

Zbadano wpływ tkaniny bazaltowej na właściwości mechaniczne przy rozciąganiu i odporność na uderzenie „zielonej” żywicy epoksydowej. Kompozyty o równoległym ułożeniu przędzy charakteryzowały się lepszymi właściwościami niż te o prostopadłym ułożeniu. Na właściwości miała również wpływ liczba warstw tkaniny. Wytrzymałość na rozciąganie i odporność na uderzenie kompozytów były lepsze niż dostępnych na rynku osłon lusterek bocznych ze względu na dobre właściwości włókna bazaltowego.

Effect of injection parameters on tensile and flexural properties of green composites

Rathore Rajat, Bhattacharjee Saugata, Bora Prayas, Rao Gorrepotu Surya, Samanta Sutanu, Debnath Kishore

Composites Theory and Practice

2022

R. 22, nr 4

196--204

Natural fibres are used to develop green composites due to their environmentally friendly nature, ease of availability, low cost, higher strength, as well as good thermal, acoustic, and insulating properties. In this study, jute fibre (JF) and sisal fibre (SF) were considered as reinforcement and a biodegradable polymer, namely polylactic acid (PLA), was selected to fabricate the composites by the injection moulding process. The fibres were chemically treated with sodium hydroxide (NaOH) at a concentration of 2% to improve the characteristics of the fibre. The effect of the injection moulding parameters like injection pressure (bars), injection speed (mm/s), and melting temperature (°C) on the tensile and flexural properties of the sisal fibre/polylactic acid (SF/PLA) and jute fibre/polylactic acid (JF/PLA) composites were investigated. Taguchi’s L9 orthogonal array was chosen for the design of experiments, and analysis of variance (ANOVA) was performed to find the significance and contribution of the selected parameters. The optimum levels from the main plots of both the tensile and flexural strength of the JF/PLA composite were found to be the injection pressure of 90 bars, injection speed of 60 mm/s, and injection temperature of 165°C. Meanwhile, the optimum level of tensile strength for SF/PLA-based composite was recorded as the injection pressure of 70 bars, injection speed of 40 mm/s, and temperature of 165°C. For the flexural strength, the optimum level was determined as the injection pressure of 90 bars, injection speed of 60 mm/s, and temperature of 165°C.