Properties of Surface Modified 45S5/PDLLA Composite Films Treated with Boiling Water

2010 ◽  
Vol 25 (4) ◽  
pp. 354-358 ◽  
Author(s):  
Yan-Ling ZHOU ◽  
Yuan GAO ◽  
Xi-Qin LU ◽  
Jiang CHANG
Keyword(s):  
Composite Films ◽  
Boiling Water ◽  
Surface Modified

scholarly journals Boosting Performance of Self-Polarized Fully Printed Piezoelectric Nanogenerators via Modulated Strength of Hydrogen Bonding Interactions

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1908
Author(s):  
Hai Li ◽  
Sooman Lim
Keyword(s):  
Hydrogen Bonding ◽  
Composite Film ◽  
High Performance ◽  
Composite Films ◽  
Β Phase ◽  
Hydrogen Bonding Interactions ◽  
Barium Titanate Nanoparticles ◽  
Surface Modified ◽  
Piezoelectric Devices ◽  
Piezoelectric Nanogenerators

Self-polarized piezoelectric devices have attracted significant interest owing to their fabrication processes with low energy consumption. Herein, novel poling-free piezoelectric nanogenerators (PENGs) based on self-polarized polyvinylidene difluoride (PVDF) induced by the incorporation of different surface-modified barium titanate nanoparticles (BTO NPs) were prepared via a fully printing process. To reveal the effect of intermolecular interactions between PVDF and NP surface groups, BTO NPs were modified with hydrophilic polydopamine (PDA) and hydrophobic 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) to yield PDA-BTO and PFD-BTO, respectively. This study demonstrates that the stronger hydrogen bonding interactions existed in PFD-BTO/PVDF composite film comparative to the PDA-BTO/PVDF composite film induced the higher β-phase formation (90%), which was evidenced by the XRD, FTIR and DSC results, as well as led to a better dispersion of NPs and improved mechanical properties of composite films. Consequently, PFD-BTO/PVDF-based PENGs without electric poling exhibited a significantly improved output voltage of 5.9 V and power density of 102 μW cm−3, which was 1.8 and 2.9 times higher than that of PDA-BTO/PVDF-based PENGs, respectively. This study provides a promising approach for advancing the search for high-performance, self-polarized PENGs in next-generation electric and electronic industries.

Enhanced functional properties of biodegradable Polyvinyl alcohol /carboxymethyl cellulose (PVA/CMC) composite films reinforced with L-alanine surface modified CuO nanorods

2021 ◽  
Author(s):  
Yamanappagouda Amaregouda ◽  
Kantharaju Kamanna ◽  
Tilak Gasti ◽  
Vijay Kumbar
Keyword(s):  
Polyvinyl Alcohol ◽  
Carboxymethyl Cellulose ◽  
Food Packaging ◽  
Composite Films ◽  
Nanocomposite Films ◽  
Soil Burial ◽  
High Antibacterial Activity ◽  
Active Food Packaging ◽  
Surface Modified ◽  
Cuo Nanorods

Abstract Herein, we described novel biogenic preparation of the CuO nanorods and its surface modification with L-alanine amino acid accelerated by microwave irradiation. The effect of surface functionalized CuO nanorods on the polyvinyl alcohol/carboxymethyl cellulose film physico-mechanical properties were investigated through various characterization techniques. The tensile strength was improved from 28.58 ± 0.73 MPa to 43.40 ± 0.93 MPa, UV shielding ability and barrier to the water vapors were highly enhanced when PVA/CMC matrices filled with 8 wt% of CuO-L-alanine. In addition, the prepared films exhibited acceptable overall migration limit and readily undergoes soil burial degradation. Nevertheless, CuO-L-alanine incorporated films showed potent antioxidant activity against DPPH radicals and had high antibacterial activity against Staphylococcus aureus and Escherichia coli, and antifungal activity against Candida albicans and Candida tropicalis. Furthermore, the nanocomposite films showed negligible cytotoxic effect on HEK293 and Caco-2 cell lines. In these contexts, the developed nanocomposite films can be implementing as an active food packaging material.

The Preparation of Silk Fibroin Modified PBT-co-PBS/PEG Composite Films and their Effects on Clinical Human Salivary Epithelial Cells Transplantation

2013 ◽  
Vol 18 ◽  
pp. 29-42
Author(s):  
Jie Zhu ◽  
Yue Ming Zhang ◽  
Zhi Cheng Tao ◽  
Nan Wei Xu ◽  
Li Qun Wang ◽  
...  
Keyword(s):  
Epithelial Cells ◽  
Plasma Treatment ◽  
Silk Fibroin ◽  
High Surface ◽  
Composite Films ◽  
Contact Angles ◽  
Butylene Succinate ◽  
Poly Ethylene ◽  
Surface Modified ◽  
Salivary Epithelial Cells

We reported the preparation of surface modified poly(butylene terephthalate)-co-poly(butylene succinate)-b-poly(ethylene glycol) (i.e. PBT-co-PBS/PEG) films by three methods: silk fibroin coating, SO2 plasma treatment and silk fibroin anchoring. The obtained composite films were named SF/(PBT-co-PBS/PEG), SO2/(PBT-co-PBS/PEG) and SF/SO2/(PBT-co-PBS/PEG), respectively. Their surface properties were characterized by contact angles, surface energies and XPS. The biocompatibility of the films were further evaluated by the morphology, attachment, proliferation and viability of human salivary epithelial cells (HSG cells). Results revealed that SF/SO2/(PBT-co-PBS/PEG) possessed the high surface free energy (59.67 mJ/m2) and could immobilize a great amount of fibroin (SF surface coverage: 26.39 wt%), which attributed to the formation of such polar groups as hydrosulfide group, sulfonic group, carboxyl and carbonyl ones in the process of SO2 plasma treatment. The cell tests suggested that the silk fibroin anchoring could significantly enhance the biocompatibility of PBT-co-PBS/PEG, which implied the potential application of fibroin modified PBT-co-PBS/PEG for clinical HSG cells transplantation in artificial salivary gland constructs.

Chiroptical, morphological and conducting properties of chiral nematic mesoporous cellulose/polypyrrole composite films

2017 ◽  
Vol 5 (36) ◽  
pp. 19184-19194 ◽  
Author(s):  
Erlantz Lizundia ◽  
Thanh-Dinh Nguyen ◽  
Jose L. Vilas ◽  
Wadood Y. Hamad ◽  
Mark J. MacLachlan
Keyword(s):  
Composite Materials ◽  
Composite Films ◽  
Cellulose Nanocrystal ◽  
Chemical Polymerization ◽  
Chiral Nematic ◽  
Polypyrrole Composite ◽  
Surface Modified ◽  
Cellulose Composite

Conductive chiral nematic cellulose composite materials have been fabricated via in situ oxidative chemical polymerization of pyrrole onto surface-modified mesoporous cellulose nanocrystal (CNC) films.

scholarly journals Effects of Acid-Anhydride-Modified Cellulose Nanofiber on Poly(Lactic Acid) Composite Films

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 753
Author(s):  
Naharullah Jamaluddin ◽  
Yu-I Hsu ◽  
Taka-Aki Asoh ◽  
Hiroshi Uyama
Keyword(s):  
Lactic Acid ◽  
Composite Films ◽  
Cellulose Nanofiber ◽  
Hydroxyl Group ◽  
Poly Lactic Acid ◽  
Propionic Anhydride ◽  
Acid Anhydrides ◽  
Surface Modified ◽  
Butyric Anhydride ◽  
Modified Cellulose

In this study, we investigated the effect of the addition of cellulose nanofiber (CNF) fillers on the performance of poly(lactic acid) (PLA). Modification of the hydroxyl group of cellulose to the acyl group by acid anhydrides changed the compatibility of the CNF with PLA. CNF was modified by acetic anhydride, propionic anhydride, and butyric anhydride to form surface-modified acetylated CNF (CNFa), propionylated CNF (CNFp), and butyrylated CNF (CNFb), respectively, to improve the compatibility with the PLA matrix. The effects of the different acid anhydrides were compared based on their rates of reaction in the acylation process. PLA with modified cellulose nanofiber fillers formed smoother surfaces with better transparency, mechanical, and wettability properties compared with the PLA/CNF composite film. The effects of CNFa, CNFp, and CNFb on the PLA matrix were compared, and it was found that CNFp was the best filler for PLA.

scholarly journals Improvement of cavitation resistance of composite films using functionalized alumina particles

2018 ◽  
Vol 72 (4) ◽  
pp. 205-213 ◽  
Author(s):  
Ahmed Algellai ◽  
Marija Vuksanovic ◽  
Natasa Tomic ◽  
Aleksandar Marinkovic ◽  
Marina Dojcinovic ◽  
...  
Keyword(s):  
Mass Loss ◽  
Surface Defects ◽  
Composite Films ◽  
Triethylene Glycol ◽  
Surface Modifications ◽  
Ferrous Oxide ◽  
Adhesion Properties ◽  
Alumina Particles ◽  
Surface Destruction ◽  
Surface Modified

Composite films having the UV cured Bis-GMA (Bisphenol A glycidylmethacrylate)/TEGDMA (triethylene glycol dimethacrylate) as a matrix and the ferrous oxide doped alumina (Al2O3 Fe) based particles were prepared and subjected to cavitation. In order to improve the mechanical and adhesion properties of composites, four different surface modifications of filler particles were performed: 3-methacryloxypropyltrimethoxysilane (MEMO), vinyl-tris(2-methoxyethoxy)silane (VTMOEO), (3-aminopropyl)trimethoxysilane (APTMS) and biodiesel (BD). Composite films were made with 0.5, 1.5, and 3 wt.% of ferrous oxide doped alumina particles with each of the mentioned surface modifications. Composite films were prepared on brass substrates and exposed to cavitation erosion. The erosion was monitored using the mass loss while image analysis was used to observe surface defects. The composite film reinforced with Al2O3 Fe having VTMOEO as a surface modifier was the most resistant one in terms of mass loss, as well as the level of surface destruction. Results were compared to the same polymer matrix film and composite films prepared with fillers without surface modifications revealing that all composites with surface modified fillers exhibited some improvement in resistance to cavitation.

Preparation of BaTiO3/PMMA Dielectric Films by Screen Printing

2015 ◽  
Vol 748 ◽  
pp. 163-169
Author(s):  
Xin Zhou Wu ◽  
Zheng Chen ◽  
Teng Zhou ◽  
Shuang Shuang Shao ◽  
Mei Lan Xie ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Volume Fraction ◽  
Composite Films ◽  
Dielectric Films ◽  
Practical Applications ◽  
Low Dissipation ◽  
High K ◽  
High Dielectric ◽  
Surface Modified ◽  
Screen Printed

The high-k composite dielectric ink is prepared by dispersing the surface modified BaTiO3 in PMMA solution. The high quality BaTiO3-PMMA composite films are screen printed on ITO glasses. BaTiO3 nanoparticles are surface modified with a silane coupling agent (MPTMS) to improve their affinity for PMMA matrix. The dielectric constant, loss tangent, specific capacitance and transmittance of BaTiO3/PMMA nanocomposites are investigated as the function of volume fraction of BaTiO3. These composites, which possess both high dielectric constant and low dissipation factors and can be screen printed at ambient temperature and pressures, have very wide practical applications.

Sign in / Sign up

Export Citation Format

Share Document