Mechanical Properties of Hydrophilicity Modified CaCO3-Poly (Lactic Acid) Nanocomposite

Abstract

Abstract-The goal of this work is to modify surface of calcium carbonate nanoparticles with silica (CaCO 3 @SiO 2 ) via sol-gel process, and to investigate the influence of CaCO 3 @SiO 2 on mechanical properties and fracture behavior of poly(lactic acid) nanocomposite. Modified CaCO 3 @SiO 2 nanoparticles were prepared with different Si:Ca ratios. It is found that the Si/Ca wt% was increased with respect to the Si:Ca mole ratio used in the reaction. Incorporating CaCO 3 @SiO 2 of 5 wt% increased elastic modulus, %elongation at break and notched impact strength of PLA nanocomposites. These properties of hydrophilic-modified CaCO 3 -poly(lactic acid) nanocomposite was increased with respect to the increasing of SiO 2 content on the surface of CaCO 3 nanoparticles. This implies that better compatibility between PLA matrix and nano-fillers was achieved after modification surface of CaCO 3 with SiO 2 layers.Index Terms-Nanocomposite, poly(lactic acid), calcium carbonate nanoparticle, silica, sol-gel process.

Effect of sol–gel modified nano calcium carbonate (CaCO3) on the cure, mechanical and thermal properties of acrylonitrile butadiene rubber (NBR) nanocomposites

“…However, nano CaCO 3 can behave as template nucleus and decrease the kinetic barrier to nucleation of sol-gel produced silica [21]. As a result, the surface of nucleus is encapsulated by thin layer of silica, which is confirmed by the FESEM studies in later part of our paper.…”

“…The chemistry of surface modification of nano CaCO 3 by sol-gel produced silica is illustrated in Scheme 1 [21]. The reaction starts with the hydrolysis of TEOS in presence of water and NH 3 to produce Si(OH) 4 .…”

“…As a result, the surface of nucleus is encapsulated by thin layer of silica, which is confirmed by the FESEM studies in later part of our paper. The silica present on the surfaces of nano CaCO 3 has the benefits to form linkage at the interface of rubber and filler [21].…”

Silica-coated nano calcium carbonate reinforced polychloroprene rubber nanocomposites: influence of silica coating on cure, mechanical and thermal properties

“…Thus, silica present at the surface of nano CaCO 3 can able to enhance the compatibility between CR matrix and nano CaCO 3 . Very similar type of interaction between silica coated on the surface of CaCO 3 and the hydroxyl group of poly (lactic acid) matrix was already reported by earlier researcher [28].…”

“…The mechanism of silica formation from TEOS is explained in Scheme 1 [28]. In the first step, the hydrolysis of TEOS occurs in the presence of water and NH 3 to produce Si(OH) 4 .…”