STUDIES ON THE IMPACT RESISTANCE OF CASHEW NUTSHELL POWDER AND CALCIUM CARBONATE FILLED POLYPROPYLENE
Table Of Contents
Chapter ONE
INTRODUCTION
- 1.1Background of the Study
- 1.2Research problem
- 1.3Aim and objectives
- 1.4Justification
- 1.5Scope of the studyCHAPTER TWO
- 2.0LITERATURE REVIEW
- 2.1Background of Literature
- 2.2Components of Composite Material
2.
- 2.1Matrix
2.2.1.1Polypropylene
2.
- 2.2Polymerization
2.
- 2.3Properties
2.
- 2.4Applications
- 2.3Reinforcements functions on polymer composite
2.
- 3.1Classification and types of fillers
2.
- 3.2Types of fillers
2.
- 3.3Physical properties, uses and health effects
2.
- 3.4Environmental impact
2.
- 3.5Classification of CaCO3
2.
- 3.6Uses of CaCO3 as filler
2.
- 3.7Cashew tree
2.
- 3.8Distribution
2.
- 3.9Constituents cashew
2.
- 3.10Polymers and polymer composites
2.
- 3.11Polymer composites modification
2.
- 3.12Types and components of polymer composites
2.
- 3.13Parameters affecting properties of composites
2.
- 3.14Applications, trends, and challenges of fillers
2.
- 3.15Compounding and mixing processes
2.
- 4.1Plasticizers
2.
- 4.2Stabilizers
2.
- 4.3Colourants
2.
- 4.4Flame retardants
- 2.5Thermoplastics processing techniques
2.
- 5.1Extrusion
2.
- 5.2Types of extrusion
2.
- 5.3Moulding
2.
- 5.4Compression moulding
2.
- 5.5Injection moulding
2.
- 5.6Blow moulding
2.
- 5.7Reaction-injection moulding (RIM)
2.
- 5.8Rotational moulding
2.
- 5.9Calendaring
2.
- 6.1Mechanical properties of plastics
2.
- 6.2Hardness
2.
- 6.3Abrasion resistance
2.
- 6.4Compression set and flex fatigue resistance
2.
- 6.5Flex fatigue resistance
2.
- 6.6Tensile strength, elongation at break and modulus
2.
- 6.7Resilience
- 2.7Morphological Characterisation of Composites
2.
- 7.1Spectroscopic tests
2.
- 7.2Microscopic techniques
2.
- 7.3Thermodynamic methods
2.
- 7.4X-ray diffraction (XRD)
2.
- 7.5Basics of crystallography
2.
- 7.6Production of X-rays
2.
- 7.7Bragg’s law and diffraction
2.
- 7.8Applications of XRD
2.
- 7.9Scanning electron microscopy (SEM)
2.
- 7.10Thermoforming/solid phase forming
- 2.8Physical Method of Characterising CompositesCHAPTER THREE
- 3.0MATERIALS AND METHODS
- 3.1Materials
- 3.2Apparatus Used
- 3.3Equipment Used and their Sources
- 3.4Preparation of Sample
3.
- 4.1Filler Preparation
3.
- 4.2Mixing of the Compound
- 3.5Determination of Mechanical Properties of the Prepared Polypropylene Composites
3.
- 5.1Determination of Tensile strength
3.
- 5.2Determination of Hardness of the prepared composites
3.
- 5.5Determination of Impact Strength of the prepared samples
3.
- 5.6Determination of microstructure of the prepared composites byScanning Electron Microscopy
3.
- 5.7Determination of the crystallinity of the prepared composites by X-ray Diffraction
3.
- 5.8Determination of water absorption behaviour of compositesCHAPTER FOUR
- 4.0RESULTS
- 4.1Result of Tensile Strength
- 4.2Effect of Filler Loading on the Stress of the Composites Prepared
- 4.2Result of Elongation at break
- 4.4Result of Young’s Modulus
- 4.5Impact strength results
- 4.6Hardness Results
- 4.7Sorption Result
- 4.7Morphology ResultsCHAPTER FIVE
- 5.0DISCUSSION OF RESULTS
- 5.1Structural Characterisation of Cashew Nutshell Powder
- 5.2Tensile Strength
- 5.3The impact strength
- 5.4Hardness
- 5.5Statistical Analysis of Impact Strength
- 5.6Effects of modification of unfilled and filled PP, PP/CaCO3 and PP/CNSP Composites on equilibrium sorption
5.
- 6.4Morphological studies on the PP, PP/CaCO3 and PP/CNSP composites
5.
- 6.5Structural Characterisation of the Polypropylene Composites preparedCHAPTER SIX
SUMMARY, CONCLUSION AND RECOMMENDATIONS
- 6.1Summary of Results
- 6.3Conclusion
- 6.3Recommendations
REFERENCES:
APPENDIXLIST OF ABBREVIATIONSABS Acrylonitrile-butadiene-styreneAFM Atomic Force MicroscopeASTM American Society for Testing MaterialsCaCO3 Calcium CarbonateCNSP Cashew Nutshell PowderCRH Chopped Rice HuskEVA Ethylene vinyl acetateHDT Heat Distortion TemperatureHPP homogeneous polypropyleneIM Initial modulusLDPE Low density polyethyleneLLDPE Linear low density polyethyleneLOE Linseed Oil EpoxideNR Natural RubberOM Optical MicroscopePE PolyethylenePEMA Poly (ethyl methacrylate)PET PolyethylenterephthalatPIB PolyisobutylenePMMA PolymethylmethacrylatePP PolypropylenePPC Polypropylene copolymerPRPCs Particle reinforced plastics compositesPS PolystyrenePVAc Polyvinyl acetatePVC PolyvinylchlorideSALS Small angle light scatteringSAXD Small-Angle X-ray diffractionSAXS Small-Angle X-ray ScatteringSD Spinodal decompositionSEM Scanning Electron MicroscopyTS Tensile strengthUTM Universal Testing MachineWAXD Wide Angle X-ray Diffraction
Thesis Abstract
Mechanical and morphological properties of pure polypropylene (PP) polypropylene/calcium carbonate (PP/CaCO3) and polypropylene/cashew nutshell powder (PP/CNSP)are reported in this work. The composites were prepared by compression moulding technique. The compressed moulded articles that is the PP, (PP/CaCO3) and (PP/CNSP) of different compositions (10/90, 20/80, 30/70, 40/60, 50/50, 60/40, 70/30, 80/20) were characterised for mechanical properties, water absorption capacity, structural characterisation and morphological arrangements. Comparative studies was made on the mechanical properties of the pure polypropylene (PP), polypropylene/calcium carbonate (PP/CaCO3) and polypropylene/cashew nutshell powder (PP/CNSP). Mechanical properties such as tensile strength, Young‟s modulus and percentage elongation at break, Hardness behaviour and Impact resistance of both PP/CaCO3 and PP/CNSP composites increased with increment of filler weight content (10-50g). It was noted that the specimen samples of ratio50/40 PP/CaCO3 and PP/CNSP had the highest tensile strength, when compared with other sample. These specimens could bear loads of 1075N and 468N with extensions of 4.44mm and 6.12mm respectively. Decrease in the mechanical properties were noted on continuous addition of both fillers, with drastic reduction of the mechanical properties at (70g and 80g) fillers weight except hardness that slightly increased at all the filler loading (10-80g). The surface sorption characteristics of calcium carbonate and cashew nutshell powder have been investigated and the highest percentage was recorded at 20/80 of PP/CNSP (100%). Scanning electron microscopy (SEM) revealed that, both 60/40 PP/CaCO3, PP/CNSP and 50/50 PP/CaCO3, PP/CNSP are completely compatible at which there are no phases that are grossly separated. X-ray diffraction analysis showed that, the incorporation of the two fillers into the neat polypropylene decreased the crystallinity of the polypropylene and the crystallinity decreases with increasing filler loading.
Thesis Overview
INTRODUCTION1.1 Background of the StudyParticle reinforced plastics composites (PRPCs) are composites to which fillers (discrete particles) have been added to modify or improve the properties of the matrix and/or replace some of the matrix volume with a less expensive material. Common applications of PRPCs include structural materials in construction, packaging, automobile tires, medicine, etc. Determination of effective properties of composites is an essential problem in many engineering applications (Van, 2003 and Love, 2004).These properties are influenced by the size, shape, properties and spatial distributions of the reinforcement (Liu, 1995 and Lee, 1998).Modification of organic polymers through incorporation of additives yield, with few exceptions, multiphase systems containing the additive embedded in a continuous polymeric matrix. The resulting mixtures are characterised by unique microstructures that are responsible for their properties. Polymer composites are mixtures of polymers with inorganic or organic additives having certain geometries. Thus, they consist of two or more components and two or more phases. In addition to polymer composites, other important types of modified polymer systems include polymer-polymer blends and polymeric forms. Blending procedures had been employed since time immemorial. The principle of blending is geared towards achieving property averaging. A blend is therefore the physical mixture of two or more substances, without a chemical bond, (Mamza, 2011).Among the various studies carried out with particle filled PP worth mentioning, are works by Maiti and Mahapatro (1992 and 2011) on the tensile and impact behaviour of nickel powder-filled PP and CaCO3 filled PP composites. It was discovered that the addition of nickel-powder causes decrease in tensile modulus, tensile strength and elongation-at-break with increasing filler. In the case of the addition of CaCO3, tensile modulus increased while tensile strength and elongation-at-break decreased with increasing filler. Izod impact strength for the composites at first application of filler loading increased up to a critical filler content, beyond which the value decreased appreciably.
The filler cashew nutshell powder (CNSP) has been under utilised, in composite formulation, as it is considered as waste material especially in the Northern part of Nigeria. Thus, there is need to convert this waste to wealth meanwhile this conversion would serve as an environmental waste control.
The main aim of this work was to determine the impact resistance of cashew nutshell powder and calcium carbonate used as fillers for polypropylene.The specific objectives of the study are;
- Collection of samples from the outlet centre and preparation of samples.
- Determination and characterisation of cashew nutshell powder using X-ray diffraction analysis.
- To carry out mechanical tests such as hardness, tensile strength, elongation at break, impact resistance and to carry out sorption test on the produced samples,
- Determination of microstructure of the processed samples using scanning electron microscopy (SEM).
Cashew nut shell powder as one of the fillers used in this research can reduce the cost of production of articles compared to the commercially available fillers. It can create job opportunity locally, by paying people supplying it for the researchers. The use of cashew nutshell powder as filler can help to reduce environmental pollution caused by the shell, this is because, it is biodegradable and it can decay and becomes a pollutant to the society.
- To prepare and characterise CNSP filler
- To fill cashew nutshell powder in polypropylene
- To fill calcium carbonate in polypropylene
- To carry out mechanical tests on the prepared composite, such as hardness, tensile strength, elongation at break, sorption test, and impact resistance
- To compare the impact resistance of cashew nutshell powder and calcium carbonate filled polypropylene