Influence of alkali treatment on flax fiber for use as reinforcements in polylactide stereocomplex composites

2015 ◽  
Vol 55 (11) ◽  
pp. 2553-2558 ◽  
Author(s):  
Huihui Zhang ◽  
Ruihao Ming ◽  
Gesheng Yang ◽  
Yuzeng Li ◽  
Qiao Li ◽  
...  
Keyword(s):  
Alkali Treatment ◽  
Flax Fiber

Effects of Alkali Treatment on the Properties of Short Flax Fiber–Poly(Lactic Acid) Eco-Composites

2010 ◽  
Vol 19 (1) ◽  
pp. 11-17 ◽  
Author(s):  
Merlin Aydın ◽  
Hale Tozlu ◽  
Sebnem Kemaloglu ◽  
Ayse Aytac ◽  
Guralp Ozkoc
Keyword(s):  
Lactic Acid ◽  
Alkali Treatment ◽  
Flax Fiber ◽  
Poly Lactic Acid

The Effects of Ultrasonic Wave on the Properties of Flax Fiber Treated in Alkali

2014 ◽  
Vol 1037 ◽  
pp. 11-15 ◽  
Author(s):  
Peng Ling Li ◽  
Yan Guo ◽  
Bei Bo Zhang
Keyword(s):  
Ultrasonic Wave ◽  
Alkali Treatment ◽  
Short Fiber ◽  
Fiber Content ◽  
Flax Fiber ◽  
High Consumption ◽  
Processing Effects ◽  
Better Than

In order to improve the spinnability of flax fiber during alkali treatment and save reagent, the effects on the properties of flax fiber are studied under the condition that both ultrasonic and NaOH reagent. It was observed that in the process of alkali treatment to flax fiber, it was better than use ultrasonic when it comes to the length, splitting degree and short fiber content. During the process of alkali treatment, the processing effects were good when the temperature was 50°C, time 30min, frequency 28kHz, concentration of NaOH 10%. Not only the spinnability of the flax fiber is improved with the use of ultrasonic, but also the problems high consumption of time, and pollution are solved.

scholarly journals Strength and Damping Properties of Cementitious Composites Incorporating Original and Alkali Treated Flax Fibers

2019 ◽  
Vol 9 (10) ◽  
pp. 2002
Author(s):  
Pengfei Lai ◽  
Xudong Zhi ◽  
Shizhao Shen ◽  
Zheng Wang ◽  
Ping Yu
Keyword(s):  
Alkali Treatment ◽  
Mechanical Analysis ◽  
Flax Fiber ◽  
Cementitious Composites ◽  
Damping Properties ◽  
Structural Modifications ◽  
Flax Fibers ◽  
Damping Effect ◽  
Reinforced Cement ◽  
Flexural Tests

This experimental investigation focused on the mechanical and damping properties of raw and alkali treated flax fibers reinforced cementitious composites. The objective of this study was to research the influence of flax fiber for the damping properties of cementitious composites. The mechanical strengths were obtained using compressive and flexural tests and damping properties were measured using a dynamic mechanical analysis. Structural modifications to the treated flax fibers were analyzed using scanning electronic microscopy and mercury intrusion porosimetry. Results showed that cement compressive strength was decreased, and flexural strength was increased by the addition of untreated flax fibers. Alkali treatment improved the mechanical strength of flax reinforced cement. The addition of flax fibers improved cement damping properties, and the damping effect of untreated flax fibers was greater than that of alkali treated fibers. The loss tangent of the cementitious composites reinforced with raw and alkali treated flax fibers at an amount of 1 wt % of cement was improved by 45.83% and 37.5% at 20 Hz, respectively. The damping properties of flax fiber was attributed to friction between elementary fibers and between adjacent fiber cell walls and slipping between the fiber and matrix. Callouses, pectin, and lignocellulose in untreated flax fiber contributed to damping and their removal by alkali treatment was the main reason why untreated flax fibers had a greater damping effect as compared to alkali-modified flax fibers.

Kinetic Adsorption of Humic Acids Mixture Obtained from Microalgae on Exfoliated Graphite Nanoplatelets

2018 ◽  
Vol 69 (1) ◽  
pp. 191-195
Author(s):  
Elena Radu ◽  
Elena Emilia Oprescu ◽  
Cristina Emanuela Enascuta ◽  
Catalina Calin ◽  
Rusandica Stoica ◽  
...  
Keyword(s):  
Humic Acid ◽  
Humic Acids ◽  
Alkali Treatment ◽  
Exfoliated Graphite ◽  
Acid Mixture ◽  
Acidic Ph ◽  
Graphite Nanoplatelets ◽  
Mixture Concentration ◽  
Ft Ir ◽  
Exfoliated Graphite Nanoplatelets

The dehydration of polysaccharides fraction in the presence of acid catalysts, is a chemical process in which results as secondary product humic matter. In our work, the humic acid mixture was for the first time based on our knowledge extracted from defatted microalgae biomass rich in polysaccharides by standard alkali treatment, followed by precipitation at acidic pH. The dried humic acid mixture has been characterized using infrared spectroscopic measurements (FT-IR). Exfoliated graphite nanoplatelets (xGnP) were used as new adsorbents for this type of humic acids mixture, their adsorption being investigated. The effect of several parameters such as: contact time, concentration of humic acid mixture, concentration of xGnP, temperature and pH of the solutions were studied. The process of adsorption took place with good results, in the following conditions: at a concentration of humic acid mixture of 18.6 mg L-1, an xGnP amount of 0.01 mg in 25 mL of solution, at a temperature of 25 �� and at acidic pH values, in aqueous solution.

Mechanical Property Studies on Flax Fiber Reinforced Basalt Powder Filled Polyester Composite

2020 ◽  
Vol 13 ◽  
Author(s):  
V. Arumugaprabu ◽  
K.Arun Prasath ◽  
S. Mangaleswaran ◽  
M. Manikanda Raja ◽  
R. Jegan
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Natural Fiber ◽  
Tensile Load ◽  
Flax Fiber ◽  
Flexural Properties ◽  
Weight Percentage ◽  
Tensile Impact ◽  
Polyester Composite ◽  
Additional Support

: The objective of this research is to evaluate the tensile, impact and flexural properties of flax fiber and basalt powder filled polyester composite. Flax fiber is one of the predominant reinforcement natural fiber which possess good mechanical properties and addition of basalt powder as a filler provides additional support to the composite. The Composites are prepared using flax fiber arranged in 10 layers with varying weight percentage of the basalt powder as 5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, 25 wt.% and 30 wt.% respectively. From the results it is inferred that the composite combination 10 Layers of flax / 5 wt.%, basalt Powder absorbs more tensile load of 145 MPa. Also, for the same combination maximum flexural strength is about 60 MPa. Interestingly in the case of impact strength more energy was absorbed by 10 layers of flax and 30 wt.% of basalt powder. In addition, the failure mechanism of the composites also discussed briefly using SEM studies.

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