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ORIGINAL PAPER

Effect of Alumina Silicate (MMT K10) Nanoclay on Adhesion and Barrier Properties of Cornstarch-Based Bioadhesive M. Vishnuvarthanan 1

&

M. Fathima Al Shahidah 1 & N. R. Gobika 1 & B. Priyadharshini 1 & B. Rasika 1

Received: 24 August 2020 / Accepted: 23 September 2020 # Springer Nature B.V. 2020

Abstract The objective of this research work was to prepare and characterize the environmentally friendly paperboard bioadhesive using corn starch and alumina silicate (MMT K10) nanoclay and examined the effect of MMT K10 on adhesive and barrier properties. The adhesive structure and barrier properties were analysed by Fourier transform infrared spectroscopy, oxygen and water vapour transmission rate. The experimental results showed that, as compared with the pure corn starch, the 5 wt% of MMT K10 nanoclay incorporated corn starch adhesive exhibited the better viscosity of 25.6 Pa.S, higher solid content of 69.78% and longer storage period of 82 days. It also had high adhesive, shear, and peel strength of 132 N/mm2, 12.9 MPa, and 84 N/m. It also enhanced the barrier properties of the adhesives. The 5 wt% of MMT K10 corn starch adhesive showed the lowest oxygen and water vapour transmission rate of 2081.58 cc/m2.day.atm and 12.85 g/m2/day. The characterization showed that the enhanced performance of the corn starch with MMT K10 was because of the braced structure of the molecules. The addition of MMT K10 nanoclay to corn starch can improve its overall performance and proved the value as replaceable for conventional petrochemical adhesives. Keywords Alumina silicate . Corn starch . Adhesion . Barrier . Viscosity

1 Introduction Adhesives plays a vital role in industries and also in the life of the people with various applications ranging from automobile, aerospace, packaging, electronics, medicine, etc. [1]. In particular, the paperboard packaging industry is greatly dependent on adhesives. However, the paperboard adhesives are synthetic and non-renewable and it contains many lingering noxious materials [2]. On the other hand, synthetic adhesives became foremost because of the low cost, strong adhesive strength, and high functional properties [3]. Since the petroleum reserves are naturally limited and the synthetic adhesives costs are rising, there is an anxiety about the proffer of adhesive raw materials [4]. This deep reliance on fossil based and the damage of emission of pollutants to people’s life have generated an emergency to prepare eco friendly paperboard adhesive from renewable resources with high functional properties [5]. * M. Vishnuvarthanan [email protected] 1

Department of Printing Technology, College of Engineering, Guindy, Anna University, Chennai, Tamil Nadu 600 025, India

Starch is a kind of readily available biopolymer and it is extensively used as glues, binders, pastes, and sizing materials [1]. It is inexpensive, biodegradable, and renewable which makes the substitute for synthetic polymers. However, its properties as adhesive in paperboard are not strong enough. In re