Microbial Lactic Acid, Its Polymer Poly(lactic acid), and Their Industrial Applications

Poly(lactic acid) (PLA) is a relatively brittle polymer, and its low melt strength, ductility, and thermal stability limit its use in various industrial applications. This study aimed to investigate the effect of poly(methyl methacrylate) (PMMA) and PMMA/silica hybrid particles on the mechanical properties, interfacial adhesion, and crystallization behavior of PLA/block acrylic elastomer. PLA/block acrylic elastomer blends exhibit improved flexibility; however, phase separation occurs between PLA and block acrylic elastomer domains. Valid time-temperature superposition (TTS) measurements of viscoelastic behavior were obtained and exhibited interfacial adhesion with the addition of PMMA or PMMA/silica in PLA/block acrylic elastomer blends. In particular, the phase separation temperature was increased by the incorporation of PMMA/silica hybrid particles, which suggests a potential role for these particles in improving the phase stability. In addition, PMMA inhibits crystallization, while PMMA/silica acts as a nucleating agent, thus increasing the crystallization rate and crystallinity degree.

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Effect of Glycidyl Methacrylate (GMA) Content on Grafting Yield and Mechanical Properties of GMA Grafted Poly(Lactic Acid) Prepared by Melt Mixing Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.709.27 ◽

2016 ◽

Vol 709 ◽

pp. 27-31

Author(s):

Thanh Chi Nguyen ◽

Ruksakulpiwat Chaiwat ◽

Yupaporn Ruksakulpiwat

Keyword(s):

Mechanical Properties ◽

Lactic Acid ◽

Glycidyl Methacrylate ◽

Fracture Behaviour ◽

Industrial Applications ◽

Proton Nuclear Magnetic Resonance ◽

Poly Lactic Acid ◽

Melt Mixing ◽

Molecular Weights ◽

Grafting Reaction

Glycidyl methacrylate (GMA) was grafted onto poly (lactic acid) (PLA) by internal mixer using dicumyl peroxide (DCP) as an initiator. The results from proton nuclear magnetic resonance (1H-NMR) and gel permeation chromatograph (GPC) indicated that the grafting reaction of GMA onto PLA took place successfully. In order to obtain the optimal GMA content used to graft onto PLA chain, the GMA content was varied into 5, 10 and 15 wt% of PLA. GMA content of 10 wt% was found to give the highest elongation at break of glycidyl methacrylate grafted poly (lactic acid) (PLA-g-GMA). The weight-average molecular weights, the number-average molecular weights and polydispersity index of PLA increased after grafting with GMA. After grafting, the brittle fracture behaviour of PLA was changed to ductile fracture behaviour of PLA-g-GMA. With its superior mechanical properties compared to those of pure PLA, PLA-g-GMA can be considered to be used as a new generation of biodegradable polymer, which can be applied in many industrial applications.

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Industrial Applications of Poly(lactic acid)

10.1007/978-3-319-75459-8 ◽

2018 ◽

Cited By ~ 14

Keyword(s):

Lactic Acid ◽

Industrial Applications ◽

Poly Lactic Acid

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Tensile Properties of Poly Lactic Acid (PLA)–Tungsten Trioxide (WO3) Nano Composites for 3D Printing Process

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.a2694.109119 ◽

2019 ◽

Vol 9 (1) ◽

pp. 2511-2513

Keyword(s):

Lactic Acid ◽

3D Printing ◽

Tensile Properties ◽

Tungsten Trioxide ◽

Control Sample ◽

Industrial Applications ◽

Poly Lactic Acid ◽

Nano Composites ◽

Aliphatic Polyesters ◽

Printing Process

Poly Lactic Acid (PLA) is one of the most crucial aliphatic polyesters which is considered as one of the favourable options in environmentally friendly thermoplastic polymers since it could be biodegraded in certain conditions. PLA has been extensively used in the packaging, electronic industries, and household applications. As a result, the improvement of mechanical properties of PLA is necessary, which can be achieved through heat resistant materials such as Tungsten trioxide (WO3 ). The objective of this research was to investigate the tensile properties of PLA-WO3 . The 3D printing process was employed to fabricate PLA-WO3 (3wt% WO3 ) and Neat PLA (control sample). The tensile test was conducted to investigate the effect of WO3 to the PLA. The results show that the tensile properties of PLA-WO3 were improved up to 75% as compared to Neat PLA. This result shows positive indication to the PLA-WO3 for many industrial applications.

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