Preparation and applications of wettability-controlled fluoroalkyl end-capped oligomer/cellulose nanofiber composites

2020 ◽  
pp. 002199832095160
Author(s):  
Hideo Sawada ◽  
Yui Endo ◽  
Yuri Oikawa
Keyword(s):  
Surface Modification ◽  
Sol Gel ◽  
Composite Films ◽  
Cellulose Nanofiber ◽  
Composite Surface ◽  
Pet Fabric ◽  
Methanol Solutions ◽  
Poly Ethylene ◽  
Surface Modified ◽  
Fabric Surface

Sol-gel reaction of two fluoroalkyl end-capped vinyltrimethoxysilane oligomer [RF-(CH2CHSi(OMe)3) n-RF; RF = CF(CF3)OC3F7; n = 2, 3: RF-(VM) n-RF] in the presence of cellulose nanofiber (CNF) under non-catalytic conditions was found to provide the corresponding fluorinated oligomeric silica/CNF composites [RF-(VM-SiO3/2) n-RF/CNF]. The obtained composites were applied to the surface modification of glass to give a good oleophobic/superhydrophobic characteristic on the composite surface due to the fabrication of the roughness architecture. The RF-(VM-SiO3/2) n-RF/CNF composites were also applied to the surface modification of poly(ethylene terephthalate) [PET] fabric swatch, affording a superoleophilic/superhydrophobic characteristic on the modified fabric surface. Modified PET fabric swatch thus obtained was applicable to not only the separation membrane to separate the mixture of oil/water but also the perfect adsorption of oil droplets spread on water interface. In addition, we have prepared the RF-(VM-SiO3/2) n-RF/CNF composites films by casting homogeneous aqueous methanol solutions containing the corresponding composites. Pristine CNF film afforded the superoleophilic property on the surface; however, it was demonstrated that the obtained transparent colorless CNF composite films can supply highly oleophobic characteristic on the surface.

The Wearability of Soybean Protein/Poly (Ethylene Terephthalate) Composite Fabric

2014 ◽  
Vol 1004-1005 ◽  
pp. 513-516
Author(s):  
Yong Hua Lu ◽  
Su Hua Gao ◽  
Feng Xiu Zhang ◽  
Yuan Song Zhang ◽  
Gang Xian Zhang
Keyword(s):  
Water Absorption ◽  
Ethylene Terephthalate ◽  
Soybean Protein ◽  
Air Permeability ◽  
Pet Fabric ◽  
Moisture Permeability ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Recovery Angle ◽  
Fabric Surface

In this paper,the soybean protein / poly (ethylene terephthalate)PET composite fabric was obtained and its wearability was mainly studied. It is found that the moisture regain, water absorption, air permeability and moisture permeability of soybean protein PET composite fabric were improved greatly. In addition, the whiteness and elastic wrinkle recovery angle kept well, and the stiffness increased incredibly. Therefore, soybean protein being grafted on PET fabric surface not only improved the biocompatibility, but also the wearability.

Change in the Crystallite Orientation of Poly(ethylene oxide)/Cellulose Nanofiber Composite Films

2017 ◽  
Vol 18 (12) ◽  
pp. 4411-4415 ◽  
Author(s):  
Miki Noda Fukuya ◽  
Kazunobu Senoo ◽  
Masaru Kotera ◽  
Mamoru Yoshimoto ◽  
Osami Sakata
Keyword(s):  
Ethylene Oxide ◽  
Composite Films ◽  
Cellulose Nanofiber ◽  
Crystallite Orientation ◽  
Nanofiber Composite ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Surface modification of bentonites. III. Sol-gel transitions of Na-montmorillonite in the presence of trimethylammonium- end-capped poly(ethylene oxides)

Clay Minerals ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 523-536 ◽  
Author(s):  
G. Lagaly ◽  
S. Ziesmer
Keyword(s):  
Surface Modification ◽  
Molar Mass ◽  
Sol Gel ◽  
Charge Compensation ◽  
Steric Stabilization ◽  
Critical Coagulation Concentration ◽  
Polymer Addition ◽  
Depletion Flocculation ◽  
Colloidal State ◽  
Poly Ethylene

AbstractThe colloidal state (sol, flocs, gels) of Na-montmorillonite dispersions (from bentonite from Bavaria, Germany) was adjusted by the addition of poly(ethylene oxides) with terminal trimethylammonium groups. The colloidal state of the dispersions changed with the molar mass of these end-capped poly(ethylene oxides). The sol-gel diagrams (up to 4.5% (w/w) montmorillonite) in the presence of TMA-PEO 1500 and TMA-PEO 4000 (up to 40 g/l) were characterized by large fields of gel whereas TMA-PEO 20000 and TMA-PEO 35000 caused peptization by steric stabilization. Even dispersions with the highest montmorillonite content (4.5%) were peptized by >0.2 g/l TMA-PEO 35000. The critical coagulation concentration of NaCl was increased by the polymer addition, but the increase was modest (from 8-12 mmol/l to 50 mmol/l). The changes of the colloidal state, the flow behaviour and the salt coagulation reveal the sensitive interplay between stabilization mechanisms (electrostatic, steric) and destabilization effects (bridging, charge compensation, depletion flocculation).

scholarly journals Cotton fabric surface modification for improved UV radiation protection using sol–gel process

2007 ◽  
Vol 104 (1) ◽  
pp. 111-117 ◽  
Author(s):  
Noureddine Abidi ◽  
Eric Hequet ◽  
Sowmitri Tarimala ◽  
Lenore L. Dai
Keyword(s):  
Surface Modification ◽  
Radiation Protection ◽  
Uv Radiation ◽  
Cotton Fabric ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Fabric Surface

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.

Surface Modification of SiC Powder for Use in Electrophoretic Deposition

2009 ◽  
Vol 412 ◽  
pp. 287-290 ◽  
Author(s):  
Saki Sakakibara ◽  
Tohru Suzuki ◽  
Atsunori Matsuda ◽  
Tetsuo Uchikoshi
Keyword(s):  
Surface Modification ◽  
Isoelectric Point ◽  
Electrophoretic Deposition ◽  
Hot Pressing ◽  
Sol Gel ◽  
Argon Atmosphere ◽  
Green Compact ◽  
Gel Method ◽  
Sol Gel Method ◽  
Surface Modified

The surface modification of SiC powder with an alumina precursor was achieved by a sol-gel method to apply the electrophoretic deposition (EPD) technique to the shaping of the SiC powder. The isoelectric point of the surface-modified SiC powder with sol-gel-derived alumina precursor was shifted to around pH 9, which is close to that of alumina. The alumina-coated SiC deposited on a cathodic substrate by EPD. The green compact of surface-modified SiC powder was sintered by hot pressing in an argon atmosphere at 2000oC.

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.

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