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Research & Development in Material Science

Mechanical Characterization of Natural Fiber based Polymer Matrix Composite -A Review

Shubham Mishra1*, Ashish Dubey1, Eswara Prasad1 and Sanjay Agarwal2

1Defense Materials & Stores Research & Development Establishment (DMSRDE), India

2Bundelkhand Institute of Engineering and Technology, India

*Corresponding author:Shubham Mishra, Defense Materials & Stores Research & Development Establishment (DMSRDE), GT Road, Kanpur, India

Submission: August 15, 2019;Published: August 23, 2019

DOI: 10.31031/RDMS.2019.11.000765

ISSN: 2576-8840
Volume11 Issue3

Abstract

Environmental preservation has been a prominent concern for each country and numerous guidelines have been framed by International bodies. Due to obvious advantages use of polymer composites are increasing and automobile and aero industry are the biggest consumers. In the last few decades non degradable, hazardous fibers and matrices have been used in fabrication of composites for various applications. In recent time natural fiber such as Jute, Kemp, Cotton, Flax which are enormously found in nature are very much able to replace these hazardous fiber-based composites due to ecofriendly, biodegradable characteristics. They can also be used in hybrid composites with synthetic fibers to bring functionalities. This article is focused on some recent updates and findings in field of mechanical characterizations of natural fiber-based polymer composites.

Introduction

Polymer composites are primarily composed of matrix and reinforcement as glass fiber and carbon fiber. These types of fibers are known as synthetic or man-made fibers. These type of synthetic fibers based polymer composites have a certain drawback such as after being used these composites are not reusable and biodegradable. This is a major concern for environment, to counter this problem Natural Fiber (NF) has been introduced in polymer composites as reinforcement. Natural fibers are extracted from plants such as jute, cotton, flax, hemp, sisal, kenaf, pineapple, ramie, bamboo and banana as lingo cellulosic fibers. Classification of natural fibers is shown in Figure 1. Various natural fibers produced from plants have been shown in Figure 2. Natural fiber based composites are renewable, economical, completely or partially recyclable, and biodegradable. Their availability, renewability, less density and cost as well as reasonable mechanical properties make them a potential alternative of synthetic fibers [1]. Properties of selected natural fiber are as shown in Table 1 [2].

Table 1:Physical properties of various natural fibers.


Figure 1:Classification of natural fibers.


Figure 2:Natural fibers produced from plants.


Mechanical properties of natural fiber reinforced polymer composites

The mechanical properties of any polymer composites depend on various factors such as

A. Physical properties of fiber.

B. Matrix (Thermosets and Thermoplastics) properties.

C. Fiber volume fraction in composites.

D. Interlayer bonding between matrix and fibers.

E. Orientation and geometry of fibers.

Various standardized and non-standardized mechanical tests [3] have been conducted by many researchers and scientists. Different fiber matrix combinations have been tried out such as abaca-polypropylene [4], bamboo- polylactic acid [5], bananaepoxy [6], flax-epoxy [7], jute-epoxy [8], kenaf-polyester [9]. Tensile strength and modulus of these fiber matrix systems are shown in Figure 3.

Ajith et al. [10] have prepared fiber reinforced composites with jute fibers (fiber length 5-6mm) with two different resins polyester and epoxy. Tensile strength of the jute epoxy composite is more than jute polyester composite. Jute polyester composite took less time in processing as compared to jute epoxy composite. Sarikaya et al. [11] fabricated epoxy-based composites with different fibers birch, palm, and eucalyptus by combination of Resin Transfer Moulding (RTM) and moulded fiber production technique. Mechanical properties of these systems are shown in Table 2. Campana et al. [12] investigated the impact of post curing temperature (100 ˚C, 120 ˚C, 150 ˚C) on mechanical properties of flax-epoxy composite system. At high post curing temperature tensile properties slightly decreases. Sajeeb et al. [13] fabricated the composites in which khadi, Coconut Leaf Midrib (CLM) fibers with Melamine Urea Formaldehyde resin (MUF) and polyester resin. Result showed that MUF resin have better mechanical properties than polyester resin due to MUF resin with natural fibers have good binding property.

Figure 3:Tensile properties of different composites system.


Table 2:Mechanical properties of different fibers-based composites.


Mechanical properties of natural and synthetic fiber based hybrid polymer composites

There are many disadvantages associated with natural fiber reinforced polymer composites such as lower strength, lower modulus, and poor moisture resistance as compared to GFRP. Hybridization of natural fiber with synthetic fiber can improve the different property which is lacking before. Various research groups around the globe have done significant work in this field some of the recent work briefly reviewed here:

John et al. [14] studied variation of impact strength and compressive strength of unsaturated polyester based sisal/ glass hybrid composite with fiber loading. The result showed that with increased glass fiber percentage impact strength increased, but compressive strength decreases with increase in glass fiber percentage. Ramesh et al. [15] investigated the mechanical properties of three different composite sisal/GFRP, jute/GFRP, sisal/jute/GFRP samples and performed mechanical characterization such as tensile, flexural and impact test. The result showed that jute/GFRP composite sample having high tensile strength around 229 MPa whereas high flexural strength achieved in sisal/jute/GFRP and maximum impact strength is achieved in sisal/GFRP sample around 18.67 Joules. Chaithanyan et al. [16] prepared the composite with 50:50 ratio sisal-glass fiber and resin combination. The tensile strength of is observed around 97MPa. Whereas hybrid composite with 40% sisal coir- glass fibers and 60% resin combination have high flexural strength 138.87 MPa and high impact strength 1.429KJ/m2. Sanjay et al. [17] fabricated the hybrid composite of jute-E-glass fiber reinforced epoxy composite. The result showed glass fiber as outer layers has better mechanical properties as compared to jute fiber as an outer layer. Jarukumjorn et al. [18] investigated the impact of glass fiber hybridization on the physical properties of sisal-polypropylene composite. Hybridization with glass fiber increases the mechanical property of composite and also increases the thermal stability. Tensile, flexural, and impact properties of the sisal-PP composites were improved due to interlayer adhesion between the fiber and matrix improved by compatibilizer.

Muthuvel et al. [19] fabricated the glass-jute fiber reinforced epoxy composites with different fiber lengths. The mechanical properties of composites were greatly influenced by fiber length. Fiber diameter with 3mm shows better tensile strength, flexural property and impact property than others. Bharat et al. [20] has prepared two different composites first one is Aloe Vera-Ceramic Fiber Wool-Glass fiber with Epoxy resin matrix and other one is Sisal fiber-Ceramic Fiber Wool-Glass fiber with Epoxy resin matrix. Tensile strength, flexural strength and impact strength of Sisal fiber-Ceramic Fiber Wool-Glass fiber with Epoxy resin is more than Aloe Vera-Ceramic Fiber Wool-Glass fiber with Epoxy resin. Muhammad et al. [21] studied the mechanical properties of hybrid glass/Kenaf fiber-reinforced epoxy composite with the matrix modification using Liquid Epoxidized Natural Rubber (LENR) as a toughing agent. The results showed that the hybridization of Kenaf fiber with the glass fibre could produce better composite properties compared to the single Kenaf fiber system. Ramesh et al. [22] fabricated the Kenaf and glass fibers reinforced polymer composites with two different fiber orientations of 0° and 90°. Mechanical property such as tensile strength, flexural strength and impact strength is evaluated, and the result showed that Kenafglass fiber reinforced hybrid composites with 90° fiber orientation have more tensile and impact strengths than the composites with 0° fiber orientation but the composites with 0° orientation have more flexural strength than the composites.

Conclusion

Natural fiber reinforced composites due to its nonabrasive, ecofriendly and biodegradable characteristics have good future scope. Due to ease of availability, various types of fibers can be found in nature that is why mechanical properties vary from fiber to fiber. By altering the factors such as fiber orientation, length of fiber, manufacturing process and curing temperature desired properties can be tailored. Jute, sisal, flax and Hemp are mostly used fibers due to good mechanical characteristics. These fibers also easily hybridize with synthetic fibers (glass, carbon) when structural properties are the priority.

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© 2019 Shubham Mishra. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and build upon your work non-commercially.



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