Sains Malaysiana 49(9)(2020): 2101-2111

http://dx.doi.org/10.17576/jsm-2020-4909-08

Sifat Mekanik dan Terma Nanokomposit Asid Polilaktik/Cecair Getah Asli/Polianilina Diperkukuh Berpenguat Grafin pada Kandungan Rendah

 (Mechanical and Thermal Properties of Toughened Polylactic Acid/Liquid Natural Rubber/Polyaniline Nanocomposites Reinforced Graphene at Low Loading)

DALILA SHAHDAN¹, RUEY SHAN CHEN^1,2* & SAHRIM AHMAD^1,2

¹Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Materials Science Programme, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Diserahkan: 15 Januari 2020/Diterima: 15 April 2020

ABSTRAK

Kajian ini dijalankan bagi mengkaji kesan penambahan bahan pengisi grafin berplat nano (GNP) ke atas sifat mekanik dan terma bagi nanokomposit polilaktik asid (PLA)/cecair getah asli (LNR)/polianilina (PANI). Nanokomposit PLA/LNR/PANI berpengisi GNP disediakan melalui kaedah adunan leburan dengan menggunakan mesin pengadun dalaman. Tahap pengisian kandungan bahan pengisi GNP dipelbagaikan daripada 0.2 sehingga 1.0 % bt. Spesimen yang telah dicirikan melalui ujian mekanik serta analisis termogravimetri (TGA), kalorimetri imbasan pembezaan (DSC) dan kekonduksian terma (TCA) menunjukkan peningkatan sifat yang positif dengan penambahan GNP pada kandungan rendah dalam matriks polimer. Keputusan sifat regangan, hentaman dan kestabilan terma menyatakan kandungan optimum dicapai pada 0.4 % bt. Berdasarkan ujian lenturan dan TCA pula, peningkatan optimum masing-masing didapati pada kandungan yang berbeza iaitu 0.6 dan 0.8 % bt. GNP.

Kata kunci: Grafin nanoplat; kekonduksian terma; kestabilan terma; komposit termoplastik

ABSTRACT

This study was conducted to study the effect of adding graphene nanoplatelets (GNP) nanofiller on the mechanical and thermal properties of polylactic acid (PLA)/liquid natural rubber (LNR)/polyaniline (PANI) nanocomposite. The PLA/LNR/PANI nanocomposites filled with GNP was prepared via melt blending method using an internal mixer. The contents of the GNP fillers were varied from 0.2 to 1.0 wt. %. Characterized specimen through a series of test such as mechanical test, thermogravimetry analysis (TGA), differential scanning calorimetry (DSC), and thermal conductivity analyzer (TCA) showed positive properties improvement with the addition of GNP at low content in the polymer matrix. The results of tensile, impact, and thermal stability properties indicated the optimum content was achieved at 0.4 wt. %.  Based on the flexural and the TCA tests, the optimum improvement was obtained at 0.6 and 0.8 wt. % of GNP, respectively.

Keywords: Graphene nanoplatelets; thermoplastic composite; thermal conductivity; thermal stability

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*Pengarang untuk surat-menyurat; email: chen@ukm.edu.my