A comparative study of impact fracture toughness of epoxidized poly(1, 4 cis-isoprene) compatibilized PLA binary and ternary blends

Mat Piah, Mohd Bijarimi and Ahmad, Sahrim Haji and Ode, La and Mustaqeem, Mujahid and Ahmad, Mohammad Norazmi and Abdullah, Erna Normaya and Jaafar, Jamiluddin (2024) A comparative study of impact fracture toughness of epoxidized poly(1, 4 cis-isoprene) compatibilized PLA binary and ternary blends. Chemical Engineering & Technology. pp. 1-10. ISSN 0930-7516 E-ISSN 1521-4125

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Abstract

Poly(lactic acid) (PLA) is a biodegradable polymer with limited application because of its intrinsic brittleness, low toughness, and low elongation at break. Melt blends were prepared by mixing a natural rubber (NR, poly(1,4-cis-isoprene) in the form of liquid NR (LNR), liquid-epoxidized NR (LENR), and polypropylene (PP) in the PLA matrix. Four blend systems were designed and prepared, i.e., PLA–PP, PLA–PP–LNR, and PLA–LNR or PLA–LENR. The composition of PP in the blend was fixed at 10 % PLAPP (90/10). Results showed that PLA–PP mixed with LNR improved impact and elongation at break. The binary blend of PLA–LNR (90/10) significantly enhanced impact strength and elongation at break properties. In contrast, the binary blends of PLA–LENR (90/10) showed a lower value of elongation at break (9.5 % vs. 37.3%) and impact strength (4.56 kJ m−2 vs. 6.44 kJ m−2). The melting temperature (Tm) and the glass transition temperature (Tg) were measured by differential scanning calorimetry, which recorded slight changes in the glass temperatures and melting temperatures. Scanning electron microscopy images of the tensile fracture of the PLA–LNR (90/10) blend showed the presence of large fibrils associated with the ductile failure related to neat PLA. Finally, the fracture toughness (KIC) of PLA–LNR (90/10) showed an increase of 39 % over neat PLA (2.94 MPa.m1/2 vs. 4.08MPa.m1/2).

Item Type:	Article (Journal)
Uncontrolled Keywords:	Fracture toughness; Liquid natural rubber; Melt-blending; Poly(lactic acid); Polypropylene
Subjects:	Q Science > QD Chemistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Chemistry
Depositing User:	Dr Mohammad Norazmi Ahmad
Date Deposited:	24 Jul 2024 15:54
Last Modified:	15 Aug 2024 12:02
URI:	http://irep.iium.edu.my/id/eprint/113318

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