TY - JOUR ID - TI - The Effect of Peanut and Walnut Shells powders on Tensile and Microstructure of the PMMA for prosthetic Denture AU - Qahtan A. Hamad AU - Jawad K. Oleiwi b, AU - Zainab M. Abdul Monem a *, PY - 2021 VL - 39 IS - 2 part (A) Engineering SP - 196 EP - 205 JO - Engineering and Technology Journal مجلة الهندسة والتكنولوجيا SN - 16816900 24120758 AB - In the current research, the heat-cured matrix material powder of PMMAwas reinforced with Peanut and Walnut Shells (natural powders) whichare chemically treated with 5% (w/v) (NaOH) to improve the matrixbonding (PMMA) before being used as a reinforcing powder and addingto exactly similar averages particle sizes ≤ (53µm), with different weightfractions of (4, 8, and 12 wt.%). The results indicated that the Elasticmodulus values reached their maximum value at (8 wt.%.) when reinforcedwith Peanut Shells powders (1.053Gpa), while, the values of tensilestrength, elongation percentage at the break, decrease as the weightfraction of Peanut and Walnut Shells powders increase and the lowestvalues are obtained by reinforcing with Peanut Shells powders to reachtheir minimum values at (12 wt.%) where the lowest values of them are (29MPa, 2.758%) respectively. The fracture surface morphology of purePMMA seemed to be homogenous morphology in (SEM) test, whereas thefracture surface morphology of PMMA composite reinforced by (Peanutand Walnut Shells) powders and shows a smoothness fracture surfacemorphology this refers to brittle to semi ductile or ductile transformation

ER -