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ABSTRACT
The present work deals with investigating the influence of microwave power on mechanical properties of 20 wt.% coir reinforced high-density polyethylene (HDPE) composites. Chopped coir/HDPE composites were fabricated using various microwave power levels (360 W, 540 W, 720 W and 900 W). The XRD analysis of the specimens reveals that crystallinity index in various specimens was in the range of 79.54% to 84.59%. The specimen cured at 360 W exhibited a maximum tensile strength of 29.5 ± 1.5 MPa, which is 28.26% greater than composite cured at 900 W (23 ± 1.5 MPa). Flexural strength of specimen cured at 360 W was maximum (37.74 ± 2 MPa).
摘要
研究了微波功率对20wt.%Coir增强高密度聚乙烯（HDPE）复合材料力学性能的影响。采用不同微波功率水平（360W、540W、720W和900W）制备了斩波COIR／HDPE复合材料。试样的XRD分析表明，不同试样的结晶度指数在79.54%～84.59%之间。在360W下固化的试样的最大抗拉强度为29.5±1.5MPa,比900W(23±1.5MPa)下固化的复合材料高28.26%。360W固化试样的弯曲强度最大（37.74±2 MPa）
Nomenclature
| = | Complex permittivity | |
| ε’ | = | Dielectric constant |
| ε’’ | = | Dielectric loss factor |
| P | = | Power density in the material (W/m3) |
| ω | = | Angular frequency of the incident microwaves (s−1) |
| = | Effective dielectric loss factor | |
| = | Permittivity of free space (8.854 × 10−12 F/m) | |
| Erms | = | Electric field strength (V/m) |
| σ | = | Electric conductivity |
| εR | = | Relaxed permittivity of the molecule |
| εU | = | Unrelaxed permittivity of the molecule |
| τ | = | Relaxation time |
| τ0 | = | Pre-exponential factor |
| Ea | = | Activation energy |
| k | = | Boltzmann’s constant |
| T | = | Temperature |
| I002 | = | Maximum intensity of the (002) lattice diffraction peak |
| Iam | = | Intensity scattered by the amorphous part of the sample |
| F | = | Flexural load |
| L | = | Span length of the specimen |
| d | = | Displacement |
| b | = | Width of the specimen |
| h | = | Height of specimen |
Acknowledgements
First author, Manoj, gratefully acknowledges Ministry of Human Resource and Development (MHRD), Government of India for providing fellowship for the PhD work.
