Abstract
Glycidyl methacrylate (GMA) was grafted onto poly (lactic acid) (PLA) by melt mixing in internal mixer using dicumyl peroxide (DCP) as an initiator. The results from proton nuclear magnetic resonance (1H-NMR) and Fourier transform infrared (FTIR) spectroscopy indicated that the grafting reaction of GMA onto PLA took place successfully. The impact strength of PLA-g-GMA was significantly higher than that of pure PLA. The crystallinity of PLA, obtained from differential scanning calorimetry (DSC), decreased after grafting. In order to obtain the optimal mixing conditions, the mixing time was varied into 7, 10 and 14 min. The optimum mixing time of 10 min was found to give the optimum mechanical properties of glycidyl methacrylate grafted poly (lactic acid) (PLA-g- GMA). However, the mixing time played no important role in impact behavior of PLA-g-GMA. In addition, the highest crystallinity was obtained with the PLA-g-GMA prepared with the mixing time of 7 min.
Highlights
Due to the environmental issue related to non-degradable plastic wastes, the research and development of biodegradable polymers have recently taken considerable attention
The results showed that the grafting reaction was significantly influenced by reaction time
The peaks at 910 cm−1, 1150 cm−1, 1761 cm−1 and 3000 cm−1 were observed in the spectrum of PLA-g-Glycidyl methacrylate (GMA)
Summary
Due to the environmental issue related to non-degradable plastic wastes, the research and development of biodegradable polymers have recently taken considerable attention. (2015) Effect of Melt Mixing Time in Internal Mixer on Mechanical Properties and Crystallization Behavior of Glycidyl Methacrylate Grafted Poly (Lactic Acid). PLA is still more expensive than many petroleum-derived commodity plastics It has some poor physical properties such as slow crystallization rate and high brittleness, which hinder PLA to be used for various end-use applications [2]. The results showed that the grafting reaction was significantly influenced by reaction time It is one of the important variables for the preparation of functional polymer. Even the radical grafting of GMA onto polyolefin in melt mixing process has been investigated extensively, there have been very few studies focusing on the grafting of GMA onto PLA and effect of reaction time on physical properties of prepared PLA-g-GMA. In this study, we report on the GMA grafting onto PLA with different mixing times using dicumyl peroxide (DCP) as an initiator in the internal mixer
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