Halloysite nanotubes (HNT) as reinforcement for compatibilized blends of polypropylene (PP) and polylactic acid (PLA)

2021 ◽  
Vol 28 (10) ◽  
Author(s):  
Krishna Prasad Rajan ◽  
Aravinthan Gopanna ◽  
Emad A. M. Abdelghani ◽  
Selvin P. Thomas
Keyword(s):  
Polylactic Acid ◽  
Halloysite Nanotubes ◽  
Compatibilized Blends

Dielectric analysis of polypropylene (PP) and polylactic acid (PLA) blends reinforced with halloysite nanotubes

2017 ◽  
Vol 31 (8) ◽  
pp. 1042-1053 ◽  
Author(s):  
Krishna Prasad Rajan ◽  
Ahmed Al-Ghamdi ◽  
Selvin P Thomas ◽  
Aravinthan Gopanna ◽  
Murthy Chavali
Keyword(s):  
Dielectric Properties ◽  
Polylactic Acid ◽  
Loss Factor ◽  
Halloysite Nanotubes ◽  
Dynamic Mechanical Properties ◽  
Dielectric Analysis ◽  
Melt Mixing ◽  
Microelectronic Devices ◽  
Base Matrix ◽  
Tan Δ

Polypropylene (PP) and polylactic acid were blended in the ratio 80:20 by weight and compatibilized with 3 wt% of maleic anhydride-grafted-PP. The compatibilized blend was chosen as the base matrix for reinforcement with halloysite nanotubes (HNTs). The nanotube content varied from 0 to 10 wt%. Blend and the nanocomposites were prepared by melt mixing technique. Dielectric analysis of the base matrix and the nanocomposites was carried out using interdigitated electrode sensor in a DEA 288 Epsilon-dielectric analyser. The dielectric properties of the composites were measured at temperatures from 30 to 120°C at various frequencies ranging from 1 Hz to 1 kHz. Permittivity values slightly decreased as the HNT content increased from 0 to 2 wt%. It increased at 4 wt% of HNT and again slightly decreased at 6 wt% of HNT, and with further increase in HNT (HNT 8 and HNT 10) led to increase in permittivity values. Loss factor values decreased slightly as the HNT content in the composites increased from 0 to 4 wt%; but with further increase in HNT, the loss factor showed a sharp increase. Loss tangent (tan δ) values decreased up to 4 wt% of HNT (HNT 4) and then increased up to 8 wt% (HNT 8) of HNT and then decreased slightly (for HNT 10). Analysing the different dielectric properties, consistent properties were shown by 6 wt% of HNT similar to static and dynamic mechanical properties. The analysis showed that the composites can be utilized in microelectronic devices or in microelectronic packaging applications.

scholarly journals Comparison of Precipitated Calcium Carbonate/Polylactic Acid and Halloysite/Polylactic Acid Nanocomposites

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Xuetao Shi ◽  
Guangcheng Zhang ◽  
Cristina Siligardi ◽  
Guido Ori ◽  
Andrea Lazzeri
Keyword(s):  
Glass Transition ◽  
Calcium Carbonate ◽  
Polylactic Acid ◽  
Halloysite Nanotubes ◽  
Mechanical Analysis ◽  
Precipitated Calcium Carbonate ◽  
Dynamical Mechanical Analysis ◽  
Elongation At Break ◽  
Ultimate Deformation ◽  
Tensile Performance

PLA nanocomposites with stearate coated precipitated calcium carbonate (PCC) and halloysite natural nanotubes (HNT) were prepared by melt extrusion. The crystallization behavior, mechanical properties, thermal dynamical mechanical analysis (DMTA), and the morphology of the PCC/PLA, HNT/PLA, and HNT/PCC/PLA composites were discussed. Compared to halloysite nanotubes, PCC nanoparticles showed a better nucleating effect, which decreased both the glass transition and cold crystallization temperatures. The tensile performance of PLA composites showed that the addition of inorganic nanofillers increased Young’s modulus but decreased tensile strength. More interestingly, PLA composites with PCC particles exhibited an effectively increased elongation at break with respect to pure PLA, while HNT/PLA showed a decreased ultimate deformation of composites. DMTA results indicated that PLA composites had a similar storage modulus at temperatures below the glass transition and the addition of nanofillers into PLA causedTgto shift to lower temperatures by about 3°C. The morphological analysis of fractures surface of PLA nanocomposites showed good dispersion of nanofillers, formation of microvoids, and larger plastic deformation of the PLA matrix when the PCC particles were added, while a strong aggregation was noticed in composites with HNT nanofillers, which has been attributed to a nonoptimal surface coating.

scholarly journals Zinc Doped Halloysite Cooperating with Polylactic Acid for Bone Regeneration

2020 ◽  
Author(s):  
Yangyang Luo ◽  
Ahmed Humayun ◽  
David Mills
Keyword(s):  
Surface Modification ◽  
Mechanical Strength ◽  
Polylactic Acid ◽  
Type I Collagen ◽  
Halloysite Nanotubes ◽  
Calcium Deposition ◽  
Material Surface ◽  
Type I ◽  
3D Scaffold ◽  
3D Printed

Three-dimensional (3D) printing techniques have received considerable focus in the area of bone engineering due to its precise control in the fabrication of complex structures with customizable shapes, internal and external architectures, mechanical strength, and bioactivity. In this study, we design a new composition biomaterial consisting of polylactic acid (PLA), and halloysite nanotubes (HNTs) loaded with zinc nanoparticles (PLA+H+Zn). The hydrophobic surface of the 3D printed scaffold was coated with two layers of fetal bovine serum (FBS) on the sides and one layer of NaOH in the middle. Additionally, a layer of gentamicin was coated on the outermost layer against bacterial infection. Scaffolds were cultured in standard cell culture medium without the addition of osteogenic medium. This surface modification strategy improved material hydrophilicity and enhanced cell adhesion. Pre-osteoblasts cultured on these scaffolds differentiated into osteoblasts and proceeded to produce a type I collagen matrix and subsequent calcium deposition. 3D printed scaffolds formed from this composition possessed high mechanical strength and showed an osteoinductive potential. Furthermore, the external coating of antibiotics not only preserved the previous osteogenic properties of the 3D scaffold but also significantly reduced bacterial growth. Our surface modification model enabled the fabrication of a material surface that was hydrophilic and antibacterial, simultaneously, with an osteogenic property. The designed PLA+H+Zn may be a viable candidate for the fabrication of customized bone implants.

Preparation of hydroxyethyl cellulose/halloysite nanotubes graft polylactic acid-based polyurethane bionanocomposites

2020 ◽  
Vol 153 ◽  
pp. 591-599 ◽  
Author(s):  
Fatima Zia ◽  
Khalid Mahmood Zia ◽  
Zill-i-Huma Nazli ◽  
Shazia Tabasum ◽  
Muhammad Kaleem Khosa ◽  
...  
Keyword(s):  
Polylactic Acid ◽  
Halloysite Nanotubes ◽  
Hydroxyethyl Cellulose

Polylactic Acid/Halloysite Nanotubes-Titanium Dioxide Nanocomposites: Antibacterial and Mechanical Properties

2021 ◽  
Vol 1021 ◽  
pp. 270-279
Author(s):  
Abdulkader M. Alakrach ◽  
Awad A. Al-Rashdi ◽  
Taha Alqadi ◽  
Mohammed Abdulhakim Al Saadi ◽  
Sam Sung Ting ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
High Efficiency ◽  
Antibacterial Effect ◽  
Control Sample ◽  
Antibacterial Properties ◽  
Halloysite Nanotubes ◽  
Solution Casting ◽  
Elapsed Time ◽  
Solution Casting Method

Polylactic acid (PLA) nanocomposite samples with different properties like mechanical, thermal, barrier and antibacterial properties are good candidates as packaging biomaterials. Unique PLA/TiO2 and PLA/HNTs-TiO2 nanocomposite samples were fabricated by solution casting method. The mechanical and antibacterial properties of PLA/TiO2 and PLA/HNTs-TiO2 samples were investigated with comparing to the pristine PLA film as a control sample. PLA nanocomposite samples with TiO2 nanofillers showed poorer mechanical properties while PLA films with PLA/HNTs-TiO2 showed unique developments, which tensile strength improved by 46% with the incorporation of 5 wt%. The PLA nanocomposites showed a high efficiency to both Gram positive and Gram negative bacteria, significant antibacterial effect being proved after first week elapsed time by comparing to the control sample (presenting no antibacterial effect). By considering the multifunctional characteristics of PLA/TiO2 and PLA/HNTs-TiO2 nanocomposites, the samples produced by solution casting can be considered a favourable alternative as environmental-friendly packaging materials.

scholarly journals Faster Release of Lumen-Loaded Drugs than Matrix-Loaded Equivalent in Polylactic Acid/Halloysite Nanotubes

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1830 ◽  
Author(s):  
Chaitra Venkatesh ◽  
Oran Clear ◽  
Ian Major ◽  
John G. Lyons ◽  
Declan M. Devine
Keyword(s):  
Drug Delivery ◽  
Polylactic Acid ◽  
Biomedical Applications ◽  
Antiplatelet Agent ◽  
Numerical Data ◽  
Halloysite Nanotubes ◽  
Uv Spectrophotometry ◽  
Scanning Calorimetry ◽  
Model Drug

Nanocomposite-based drug delivery systems with intrinsic controlled release properties are of great interest in biomedical applications. We report a novel polylactic acid (PLA)/halloysite nanotube (HNT) nanocomposite-based drug delivery system. PLA/HNT nanocomposites have shown immense potential for use in biomedical applications due to their favorable cyto- and hemo-compatibility. The objective of this study was to evaluate the release of active pharmaceutical ingredients (API) from PLA/HNT composites matrix and the effect of preloading the API into the lumen of the HNT on its release profile. Aspirin was used in this study as a model drug as it is a common nonsteroidal anti-inflammatory and antiplatelet agent widely used for various medical conditions. These two types of drug-loaded PLA/HNT nanocomposites were characterised by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), surface wettability and mechanical testing. Statistical analysis was conducted on numerical data. Drug entrapment and in vitro drug release studies were conducted using UV spectrophotometry. Results indicate that aspirin was successfully loaded into the lumen of HNT, which resulted in the sustained release of aspirin from the nanocomposites. Furthermore, the addition of HNT into the polymer matrix increased the mechanical properties, indicating its suitability as a drug-eluting reinforcing agent.

Halloysite nanotubes grafted polylactic acid and its composites with enhanced interfacial compatibility

2020 ◽  
Vol 138 (2) ◽  
pp. 49668
Author(s):  
Yuanyuan Li ◽  
Peixian Li ◽  
Minjie Wu ◽  
Xiaoyan Yu ◽  
Kimiyoshi Naito ◽  
...  
Keyword(s):  
Polylactic Acid ◽  
Halloysite Nanotubes ◽  
Interfacial Compatibility

Tailoring Polylactic Acid Properties for Packaging Applications: Effects of Co‐Addition of Halloysite Nanotubes and Selected Plasticizers

2020 ◽  
Vol 1002 ◽  
pp. 47-56
Author(s):  
Abdulkader M. Alakrach ◽  
Nik Noriman Zulkepli ◽  
Awad A. Al-Rashdi ◽  
Sam Sung Ting ◽  
Rosniza Hamzah ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Thermal Analyses ◽  
Weight Ratio ◽  
Tensile Modulus ◽  
Halloysite Nanotubes ◽  
Low Molecular Weight ◽  
Elongation At Break ◽  
Co Addition

Polylactic acid (PLA) has recently given a huge attention because of its mechanical properties and good physical like good biodegradability and processability, high tensile modulus and strength. In the current research, the researchers utilized sesame oil (SO) and low molecular weight polyethylene glycol (PEG) as hydrophobic and hydrophilic plasticizers, towards improvise the ductility and toughness of PLA. The researchers synthesized nanocomposites by solution casting of the neat PLA/HNTs and PLA blends with weight ratio of (0,10, 20 and 30 wt%) for PEG and (0, 5 and 10 wt%) for SO. The influence of both plasticizers on chemical, thermal and mechanical properties of the nanocomposites were investigated. Characterization of the systems was achieved by mechanical testing and thermogravimetric analysis (TGA), field emission scanning electron microscope (FESEM), Fourier transform infrared spectroscopy (FTIR). The FTIR analyses confirmed the existing of hydrogen bonding between PLA and both PEG and SO. significant improvement was shown by the plasticized nanocomposites in elongation at break with the adding of PEG and SO, meanwhile, the plasticized films’ strength were decreased. For the thermal analyses, all the films exhibited lower thermal stability compared to PLA/HNTs film.

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