Crystallinity Change and Reduced Warpages on Thin Walled Parts-the Effect of Nano Fumed Silica on Polyacetal
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ORIGINAL PAPER
Crystallinity Change and Reduced Warpages on Thin Walled Parts-the Effect of Nano Fumed Silica on Polyacetal S. T. Saravanan 1
&
C. Kailasanathan 2 & Elango Natarajan 3 & Anbarasan Ramasamy 4
Received: 24 August 2020 / Accepted: 19 October 2020 # Springer Nature B.V. 2020
Abstract Polyacetal is widely used in thin walled injection moulding due to its high mechanical properties. But, its widespread application is limited due to volumetric shrinkage and warpage. The investigations on reducing warpage on Polyacetal is attempted by incorporating nano fumed silica of 1 wt% to 5 wt% as a nucleating agent. The crystallinity study shows that the crystallization rate is increased with the addition of fumed silica up to 4 wt%, beyond which it is reduced. The increased warpage and tensile strength are observed with increase in crystallinity. The tensile strength of PA/5 wt% FS nanocomposite is 1.79% lesser than PA/4 wt% FS nanocomposite, but still 2.5% higher than neat PA. The effect of the filler on surface roughness and optical properties such as haze and gloss are also studied. The micro voids are steadily increased as filler loading increases. Hence, the surface roughness increases uniformly upon increase of filler and it does not depend on crystallinity but depends on growth of micro voids. Furthermore, the microscopic analysis is carried out through FTIR, XRD and SEM and discussed. It is concluded from the above analysis that 5 wt% of FS loading into PA reduces warpage of the thin walled parts with a gain of mechanical strength than neat PA. Keywords Polyacetal . Silica . Crystallinity . Warpage . Surface roughness . Thin wall
1 Introduction Industrial demands of producing smaller, lighter and high production volume of parts made a pathway to use thin walled
* S. T. Saravanan [email protected] C. Kailasanathan [email protected] Elango Natarajan [email protected] Anbarasan Ramasamy [email protected] 1
Department of Plastic Technology, V. S. V. N. Polytechnic College, Virudhunagar, Tamilnadu, India
2
Centre for Material Research, Department of Mechanical Engineering, Sethu Institute of Technology, Pulloor, Tamilnadu, India
3
Faculty of Engineering, Technology and Built Environment, UCSI University, 56000 Kuala Lumpur, Malaysia
4
Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
injection molding in plastics molding sectors. The use of thin wall molding makes the company to produce a large quantity of parts with minimal cost and higher production rate. The term “Thin wall” is referred for portable products such as telecommunication products and commodities with wall thickness in the range of 1 mm. The thin wall automobile parts may have wall thickness of 2 mm. In general, the thin wall injection molding is used to produce parts in the range of 1 to 1.5 mm and t/d≤0.05 [1]. The major challenge in preparing of thin walled mold parts is warpage, volumetric shrinkage, surface mark and tight tolerance. The thin wall injection mold process uses
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