Role of boron mineral size on thermal, microstructural and mechanical characteristics of IPP

This study paves to way to investigate the fundamental characteristics including the crystalline melting temperature, percent crystallinity, crystal structure, unit cell parameters, crystal size, mechanical behavior, ultimate strength, Modulus and impact strength in the IPP based composites formed by blending of IPP with the varying content levels (5, 10, 15, 20 and 30%) of ulexites having different particle sizes (45 and 75 µm). The characterizations of the prepared IPP based composites containing ulexite were performed by means of conventional measurement methods such as Differential Scanning Calorimeter (DSC), X-ray diffractions and several mechanical tests. The obtained results depicted that the content and particle size of boron mineral presenting in IPP based composites had significant effects on the crucial properties of IPP. Namely, the crystalline melting temperature of IPP increased initially (from 165.46°C to 168.54°C) when adding 5% of 45 µm ulexite into IPP and then, dramatic decrease was observed with the content increment. The addition of 75 µm ulexite into to IPP matrix led to consistent decreasing of crystalline melting temperatures of IPP domains. Furthermore, a and b unit cell dimensions of monoclinic structures initially showed the expansions. The maxima of a parameters were found to be 6.683Å and 6.645Å, while the maxima of b were calculated as 20.845Å and 20.793Å for the 45µ and 75 µm ulexites, respectively, but then contracted consistently with the increasing of ulexite content. The serious decrement in c unit cell parameter was observed with the increasing of ulexite content for the both particle sizes . Moreover, the remarkable reinforcements were achieved in the ultimate strengths (from 24.99 MPa to 31.20 MPa), Young's Modulus (from 369.60 MPa to 516.05 MPa) and impact strength (from 39.56 MPa to 46,68 MPa) of the IPP based composites with 45 µm ulexite. The maximum improvements in mechanical properties were obtained with the composites containing 5% of 45 µm ulexite and mainly 15% of 75 µm ulexite. These developments presumably were caused from advance in the alignments and orientations of the IPP chains in the matrix due to presence of ulexite particles.Keywords: size effect of ulexite mineral, IPP based composites, thermal properties, unit cell parameters, mechanical reinforcement.

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