Abstract
In this study in situ bulk polymerization of L-lactide filled with layered double hydroxides (LDH) was investigated. Four different LDHs intercalated with two different organic anions (salicylate and sebacate) were synthesized and characterized. After characterization, these synthetic layered compounds were used as fillers in poly(L-lactide) (PLLA) nanocomposites with two different fillers’s loadings (1 wt% and 2 wt%). PLLA and PLLA nanocomposites were evaluated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet and visible spectroscopy, thermogravimetric analysis (TGA), dynamical mechanical analysis (DMA), flexural testing and differential scanning calorimetry (DSC). The results demonstrated that, compared to PLLA, the nanocomposite containing 1 wt% of Zn/Al salicylate transmitted less UVA and UVB light, while keeping a similar transparency in the visible region. Thermogravimetric analysis revealed that the nanocomposite with 1 wt% of Zn/Al salicylate exhibited the highest thermal stability. In general the flexural and dynamical mechanical properties were reduced in compassion to neat PLLA. DSC results, demonstrated that, compared to PLLA, all the nanocomposites exhibited lower glass transition temperature and melting temperature values.
Highlights
Nowadays, the reduction of the environmental impactLayered compounds of natural or synthetic origin are a caused by non-biodegradable polymers is a growing interest, special class of compounds in which the crystals are built especially when they are applied in the production of disposable by stacking of two dimensional units, which are items, such as packaging
poly(lactic acid) (PLA) is one of the commercially hydroxides like Mg(OH)2 and Al(OH)3; different transition available biodegradable polymers from the family of metal chalcogenides like 2H-MoS2, 1T-TiS2, V2O5, MoO3; aliphatic polyesters, which are produced from lactic acid, ii) Compounds with positively charged layers, which are a monomer that can be synthesized from many renewable resourses such as corn and sugar beets
The objective of the present study was to investigate the in situ bulk polymerization of L-Lactide in the presence of layered double hydroxides (LDH) intercalated by the anions salicylate or sebacate
Summary
The reduction of the environmental impactLayered compounds of natural or synthetic origin are a caused by non-biodegradable polymers is a growing interest, special class of compounds in which the crystals are built especially when they are applied in the production of disposable by stacking of two dimensional units (the layers), which are items, such as packaging. PLA is one of the commercially hydroxides like Mg(OH) and Al(OH); different transition available biodegradable polymers from the family of metal chalcogenides like 2H-MoS2, 1T-TiS2, V2O5, MoO3; aliphatic polyesters, which are produced from lactic acid, ii) Compounds with positively charged layers, which are a monomer that can be synthesized from many renewable resourses such as corn and sugar beets Althouth it has good compensed by the intercalation of hydrated anions as can be observed in layered double hydroxides and layered hydroxide salts; iii) Compounds, which have negatively charged mechanical properties such as high strength, thermoplasticity, layers as transition metal dichalcogenides after chemical transparency, and fabricability, its applications are limited or electrochemical reduction or some 2:1 clay minerals[4]
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