The bamboo fiber was treated with constant alkaline concentration but different duration followed by milling procedures. Then the fibers were undergone single fiber testing. The result of each single fiber is different.
a) Fiber with high lignin content and higher tensile stress (24 hours)
b) Fiber with lesser lignin content and high tensile stress (48 hours)
Which should be chosen to proceed the natural fiber composties?
Dear Tong,
I understand that depends largely of the application of the treated fiber. Exist other parameters which must be considered and not only the mechanical parameter. Moisture absorption is one of them and very important. Samples containing lignin are generally hydrophobic but have low mechanical properties. The color can also influence in the application. Generally the composites with lignin are darker compared with composites with cellulose only. If you consider only the mechanical properties, I would choose the alternative b (lesser lignin content and high tensile stress). Best regards!
Dear Mr Mario Guimarães Junior,
Thank you for your time to review my question and informative replies. You have got my mind some ideas!
In future work, the treated fiber will be used to fabricate the natural fiber composites in civil engineering application. Others existing properties as aforementioned by you, which inlcuding the moisture absorption, thermal properties, crystallinity, and topography surface of the fiber will be evaluated as well. The fiber will be further treated to modify its surface later. The colour of the fiber is yellow after washing and drying.
Ok Mr. Tong.
If you use fiber with lignin, you will not have good crystallinity, but it might be interesting because of lower hygroscopicity, which may affect other properties, including mechanics. The fiber with higher cellulose absorbs too much moisture, but this can be solved with the surface chemical modification that you will perform. If you need any help, please contact us.
Dear Mr. Mario.
Thank you co much for your explanation. Looking forward to hear you again.
in fact it depends on what you are expecting to have ! if you are looking to optimize the beneficial characteristics of the composites then you have to apply new methodologies in selecting the natural fibers and polymers like that below
Combined multi-criteria evaluation stage technique as an agro waste evaluation indicator for polymeric composites: Date palm fibers as a case study
Predicting the potential of agro waste fibers for sustainable automotive industry using a decision making model
A model for evaluating and determining the most appropriate polymer matrix type for natural fiber composites
Depending on type of polymer matrix you will work with, compatibility between fibers and matrix you can select the right ones. Not only consider on the high or higher strength, you may need to consider the cost of different treatments and other factors. Color may not be an issue in civil engineering application, but moisture absorption, thermal properties, crystallinity, and fire resistance of the composite part do. As you knew, in plant, tree, the binder such as lignin which bind the fiber together. The binders are kind of biopolymer this may contribute to the performance of you composites. Any concern or discuss to help you out, please feel fee.
Hope this will help.
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