Crystallization Behavior and Electrical Properties of Nanoparticle-Reinforced Poly(lactic Acid)-Based Films

Abstract

Graphene oxide (GO) and multiwalled carbon nanotubes with silver particles (MWNT-Ag) of different concentrations were used as nanofillers to prepare poly(lactic acid) (PLA) nanoparticle films through the solvent casting method. In this study, the effects of nanoparticles on the crystallization behavior, relationships between the dispersion and electrical properties, and hydrolytic degradation behaviors were investigated for the PLA/MWNT-Ag and PLA/rGO films. Differential scanning calorimetry was used to evaluate the crystallization behaviors of the PLA/MWNT-Ag and PLA/reduced GO (rGO) films. Electron probe microanalysis was performed to characterize the dispersion of MWNT-Ag, and X-ray diffraction and Raman spectroscopy were used to determine the degree of dispersion of rGO in the PLA matrix. The results showed that nanoparticles enhanced the crystallization kinetics of PLA as well as the hydrolytic degradation rate. From the measurement of electrical properties, the electrical conductivity of PLA/MWNT-Ag 1.0 wt% was much higher than that of the pure PLA and PLA/rGO films, showing that MANT and Ag nanoparticles contribute greatly to enhancing the electrical conductivity of the PLA/MWNT-Ag films.

Influence of the microstructure in the biodegradability process of eco‐friendly materials based on polylactic acid and mango seed for food packaging to minimize microplastic generation

“…The most intense, characteristic diffraction peaks of PLA were located at 2 θ = 16.82°, 19.14° (planes (200)/(110)) due to α‐crystals, 27 22.47°, 29.56° (planes (0010)). The PLA Corbion Purac (175*) peak intensity decreased after the dissolution process (casting), from 100% to 5%, and the interplanar distance ( d ) ranged from (5.39 Å) to (5.21 Å) since the organization of the chains might diminish, 19 (see Figure 6a and Table 1).…”

“…1 However, integument's peaks at 2θ = 15.6 and 17.2 were present when the cellulose content was high, with high amounts of amorphous components such as lignin, hemicellulose, and amorphous cellulose [24][25][26] (Figure 6b,c and Table 1). The most intense, characteristic diffraction peaks of PLA were located at 2θ = 16.82 , 19.14 (planes (200)/ (110)) due to α-crystals, 27 22.47 , 29.56 (planes (0010)). The PLA Corbion Purac (175*) peak intensity decreased after the dissolution process (casting), from 100% to 5%, and the interplanar distance (d) ranged from (5.39 Å) to (5.21 Å) since the organization of the chains might diminish, 19 (see Figure 6a and Table 1).…”

Improvement in Thermal Stability of Flexible Poly(L-lactide)-b-poly(ethylene glycol)-b-poly(L-lactide) Bioplastic by Blending with Native Cassava Starch

“…This is due to its excellent biodegradability, biocompatibility and compostability, as well as being environmentally friendly and having good processability and feasibility for an increased production scale [ 5 , 6 ]. However, the low flexibility of PLLA, due to its high glass-transition temperature (T g , around 60 °C), limits its use in many applications [ 7 , 8 , 9 ]. High-molecular-weight PLLA- b -poly(ethylene glycol)- b -PLLA triblock copolymers (PLLA-PEG-PLLA) have exhibited more flexibility than PLLA because of the high flexibility of PEG middle blocks [ 10 , 11 , 12 ].…”

Enhancement in Crystallizability of Poly(L-Lactide) Using Stereocomplex-Polylactide Powder as a Nucleating Agent

“…Various methods have been investigated to enhance the crystallization ability of PLLA, such as by nucleating-agent addition [ 8 , 9 ] and plasticizer blending [ 8 ], flow-induced crystallization [ 10 ], and stereocomplexation [ 11 , 12 , 13 ]. The addition of organic and inorganic nucleating agents has been extensively and commonly used for the promotion of PLLA crystallinity by reducing the nucleating barrier and increasing nucleating sites [ 8 , 14 , 15 ]. However, fully biodegradable and biocompatible nucleating agents still remain to be investigated.…”