Preparation and Properties of Nanocomposites Based on Poly(Lactic Acid) and Modified TiO2

2012 ◽  
Vol 463-464 ◽  
pp. 519-522 ◽  
Author(s):  
Achanai Buasri ◽  
Nattawut Chaiyut ◽  
Chanon Kritsanakun ◽  
Chettha Phatkun ◽  
Tiwiwan Khunsri
Keyword(s):  
Lactic Acid ◽  
Propionic Acid ◽  
Uv Irradiation ◽  
Nano Particles ◽  
Poly Lactic Acid ◽  
Nano Composites ◽  
Nano Particle ◽  
High Transparency ◽  
Wide Range ◽  
Ft Ir

In this study, poly (lactic acid) (PLA)-TiO2nano particle nano composites were prepared and the severe aggregation of TiO2nano particles in polymer matrixwere reduced by themodification of TiO2surface with propionic acid and n-hexylamine. The resulting products were characterized by FT-IR, DSCand SEMtechniques so as to have a better understanding of bondingbetween the polymer and nano particles. All of nano composites with a wide range of TiO2additionexhibit the high transparency. SEM micrographs of the nano composites showed of the TiO2nano particles were uniformly dispersed in polymer matrices. Photodegradation of PLA-TiO2nano particle nano composites were also investigated. The results indicated that nano composites could be efficiently photodegraded by UV irradiation in comparison with pure PLA.

The effect of carbon nanotubes-grafted lactide on the mechanical and thermal properties of poly (lactic acid) biocomposites

2017 ◽  
Vol 36 (9) ◽  
pp. 655-666 ◽  
Author(s):  
Gaihong Wu ◽  
Shuqiang Liu ◽  
Xiongying Wu ◽  
Xuemei Ding
Keyword(s):  
Carbon Nanotubes ◽  
Lactic Acid ◽  
Thermal Properties ◽  
Composite Films ◽  
Poly Lactic Acid ◽  
Mechanical And Thermal Properties ◽  
Wide Range ◽  
Ft Ir ◽  
The Fourier Transform ◽  
Flexible Fabrication

Poly(lactic acid) (PLA) derived from renewable crops is a promising substitute for petroleum-based products. Although PLA exhibits positive features, it also possesses drawbacks, such as brittleness, which hinder its extension in specific applications. In this study, lactide (LA) was used to graft carbon nanotubes (CNTs) to reinforce PLA. Under catalysis, LA was polymerized into PLA through ring-opening polymerization and simultaneously was grafted onto CNTs to obtain CNTs modified by LA (LA/CNTs). And the modified CNTs were used to prepare PLA composite films (LA/CNTs/PLA). Analysis of the Fourier transform infrared spectra (FT-IR) of the modified CNTs indicated that LA was grafted with the nanotubes. The scanning electron microscopy images showed that the modified CNTs were compatible and homogeneously dispersed in the PLA matrix. The excellent dispersibility and compatibility of the CNTs led to good interfacial adhesion, which directly enhanced the mechanical properties of PLA. The addition of CNTs also improved the thermal properties of PLA. This research aims to ameliorate the mechanical and thermal properties of PLA and provides basis for flexible fabrication of bio-based PLA materials for a wide range of applications.

Formation of Hydroxycarbonate Apatite Layer on Poly(Lactic Acid) Composites in Simulated Body Fluid

2005 ◽  
Vol 284-286 ◽  
pp. 489-492 ◽  
Author(s):  
Hirotaka Maeda ◽  
Toshihiro Kasuga ◽  
Masayuki Nogami
Keyword(s):  
Lactic Acid ◽  
Simulated Body Fluid ◽  
Zeta Potential ◽  
Calcium Chloride ◽  
Composite Membrane ◽  
Body Fluid ◽  
Poly Lactic Acid ◽  
Zeta Potentials ◽  
Carbonate Ion ◽  
Ft Ir

Hydroxycarbonate apatite (HCA), which formed on a poly(lactic acid) (PLA) composite membrane containing vaterite or calcium chloride after soaking in simulated body fluid, was examined to clarify the importance of the ceramic phases in the composites. FT-IR spectra showed that the ratio of CO3/PO4 in the infrared adsorption bands of HCA formed on the PLA composite containing vaterite was much larger than that of HCA formed on the PLA composite containing calcium chloride. Substitution of carbonate ion in hydroxyapatite is believed to be strongly influenced by ceramic phases in the composites. The zeta potentials of HCA formed on the PLA composite containing vaterite or calcium chloride was -6 mV or -17 mV, respectively. The zeta potential may be influenced by the amount of carbonate ion in hydroxyapatite.

scholarly journals Preparations of Poly(lactic acid) Dispersions in Water for Coating Applications

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2767
Author(s):  
Giada Belletti ◽  
Sara Buoso ◽  
Lucia Ricci ◽  
Alejandro Guillem-Ortiz ◽  
Alejandro Aragón-Gutiérrez ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Gel Permeation Chromatography ◽  
Sem Analysis ◽  
Water Phase ◽  
Poly Lactic Acid ◽  
Water Emulsion ◽  
Preparation Conditions ◽  
Ft Ir ◽  
Homogenization Methods ◽  
Oil In Water Emulsion

A green, effective methodology for the preparation of water-based dispersions of poly(lactic acid) (PLA) for coating purposes is herein presented. The procedure consists of two steps: in the first one, an oil-in-water emulsion is obtained by mixing a solution of PLA in ethyl acetate with a water phase containing surfactant and stabilizer. Different homogenization methods as well as oil/water phase ratio, surfactant and stabilizer combinations were screened. In the second step, the quantitative evaporation of the organic provides water dispersions of PLA that are stable, at least, over several weeks at room temperature or at 4 °C. Particle size was in the 200–500 nm range, depending on the preparation conditions, as confirmed by scanning electron microscope (SEM) analysis. PLA was found not to suffer significant molecular weight degradation by gel permeation chromatography (GPC) analysis. Furthermore, two selected formulations with glass transition temperature (Tg) of 51 °C and 34 °C were tested for the preparation of PLA films by drying in PTFE capsules. In both cases, continuous films that are homogeneous by Fourier-transform infrared spectroscopy (FT-IR) and SEM observation were obtained only when drying was performed above 60 °C. The formulation with lower Tg results in films which are more flexible and transparent.

Characterization of Electrospun Poly(Lactic Acid)/polyaniline Blend Nanofibers

2011 ◽  
Vol 332-334 ◽  
pp. 317-320 ◽  
Author(s):  
Hui Qin Zhang
Keyword(s):  
Lactic Acid ◽  
Composite Nanofibers ◽  
Weight Ratio ◽  
Electrospinning Process ◽  
Poly Lactic Acid ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Ft Ir

In this study, composite nanofibers of polyaniline doped with dodecylbenzene sulfonic acid (PANI-DBSA) and Poly(lactic acid) (PLA) were prepared via an electrospinning process. The surface morphology, thermal properties and crystal structure of PLA/PANI-DBSA nanofibers are characterized using Fourier transform infrared spectroscopy (FT-IR), wide-angle x-ray diffraction (WAXD) and scanning electron microscopy (SEM). SEM images showed that the morphology and diameter of the nanofibers were affected by the weight ratio of blend solution.

Transmission FT-IR Study on the Adsorption and Reactions of Lactic Acid and Poly(lactic acid) on TiO2

2010 ◽  
Vol 114 (41) ◽  
pp. 17720-17727 ◽  
Author(s):  
Yi-Kwan Chen ◽  
Yu-Feng Lin ◽  
Zih-Wei Peng ◽  
Jong-Liang Lin
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Ft Ir ◽  
Ir Study

Ageing of plasticized poly(lactic acid)/poly(β-hydroxybutyrate) blend films under artificial UV irradiation and under real agricultural conditions during their application as mulches‡

2016 ◽  
Vol 70 (9) ◽  
Author(s):  
Katarína Mosnáčková ◽  
Alena Šišková ◽  
Ivica Janigová ◽  
Jozef Kollár ◽  
Miroslav Šlosár ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Uv Irradiation ◽  
Poly Lactic Acid ◽  
Natural Ageing ◽  
Blend Films ◽  
Artificial Uv

AbstractThe paper is aimed on the investigation of natural ageing of plasticized poly(lactic acid)/poly(

334 Dynamic Properties of Nano-particle Added Poly(lactic acid)

2013 ◽  
Vol 2013.21 (0) ◽  
pp. _334-1_-_334-3_
Author(s):  
Masahiro NISHIDA ◽  
Rie NATSUME ◽  
Norio FUKUDA ◽  
Hiroaki ITO
Keyword(s):  
Lactic Acid ◽  
Dynamic Properties ◽  
Poly Lactic Acid ◽  
Nano Particle

Preparation and Characterization of Magnetic Strong-Base Anion Exchange Resin

2011 ◽  
Vol 239-242 ◽  
pp. 1838-1841 ◽  
Author(s):  
Chen Dong Shuang ◽  
Feng Yang ◽  
Yang Zhou ◽  
Peng Hui Li ◽  
Ai Min Li
Keyword(s):  
Electron Microscope ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Nano Particles ◽  
Nano Particle ◽  
Strong Base ◽  
Transmission Electron ◽  
Ft Ir ◽  
Magnetic Nano Particles

The magnetic copolymer was prepared by polymerization of glycidyl methacrylate (GMA) and divinylbenzene (DVB) in the presence of OA-modified magnetic nano-particles. The magnetic strong-base anion exchange resin (MAER) was formed by quaternization of magnetic copolymer. Transmission electron microscope (TEM) and scanning electron microscope (SEM) were used for observation of prepared magnetic nano-particle and MAER, respectively. FT-IR spectrometer was used to characterize the magnetic nano-particle and MAER. To explore the potential application of MAER for natural organic matter (NOM) removal, completely-mixed (CMC) mode was used for humic acid (HA) adsorption. It was found that the HA removal for CMC mode with MAER resin was 10~20% higher than conventional process before breakthrough.

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