Amphiphilic marine coating systems of self-stratified PDMS-PEG surfaces with an epoxy-polyurethane matrix

2022 ◽  
Author(s):  
AliReza Rahimi ◽  
Morgan Murphy ◽  
Kinza Faiyaz ◽  
Shane J. Stafslien ◽  
Lyndsi Vanderwal ◽  
...  
Keyword(s):  
Polyurethane Matrix

scholarly journals Ultrarobust, tough and highly stretchable self-healing materials based on cartilage-inspired noncovalent assembly nanostructure

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yuyan Wang ◽  
Xin Huang ◽  
Xinxing Zhang
Keyword(s):  
Spider Silk ◽  
Self Healing ◽  
High Toughness ◽  
Healing Efficiency ◽  
Strong Interfacial Interaction ◽  
Highly Stretchable ◽  
Noncovalent Bonds ◽  
Actuation Devices ◽  
Noncovalent Bonding ◽  
Polyurethane Matrix

AbstractSelf-healing materials integrated with excellent mechanical strength and simultaneously high healing efficiency would be of great use in many fields, however their fabrication has been proven extremely challenging. Here, inspired by biological cartilage, we present an ultrarobust self-healing material by incorporating high density noncovalent bonds at the interfaces between the dentritic tannic acid-modified tungsten disulfide nanosheets and polyurethane matrix to collectively produce a strong interfacial interaction. The resultant nanocomposite material with interwoven network shows excellent tensile strength (52.3 MPa), high toughness (282.7 MJ m‒3, which is 1.6 times higher than spider silk and 9.4 times higher than metallic aluminum), high stretchability (1020.8%) and excellent healing efficiency (80–100%), which overturns the previous understanding of traditional noncovalent bonding self-healing materials where high mechanical robustness and healing ability are mutually exclusive. Moreover, the interfacical supramolecular crosslinking structure enables the functional-healing ability of the resultant flexible smart actuation devices. This work opens an avenue toward the development of ultrarobust self-healing materials for various flexible functional devices.

Nanocomposites based on Waterborne Polyurethane Matrix and Fe 3 O 4 Nanoparticles: Synthesis and Characterization

2021 ◽  
Author(s):  
Cintia Meiorin ◽  
Selina L. Scherzer ◽  
Verónica Mucci ◽  
Daniel G. Actis ◽  
Pedro Mendoza Zelis ◽  
...  
Keyword(s):  
Waterborne Polyurethane ◽  
Synthesis And Characterization ◽  
Nanoparticles Synthesis ◽  
Polyurethane Matrix

scholarly journals Bio-based polyurethane nanocomposite thin coatings from two comparable POSS with eight same vertex groups for controlled release urea

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lixia Li ◽  
Meng Wang ◽  
Xiandong Wu ◽  
Wenping Yi ◽  
Qiang Xiao
Keyword(s):  
In Situ Polymerization ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Poly Ethylene Glycol ◽  
Thin Coatings ◽  
Polyurethane Coatings ◽  
Coated Urea ◽  
Poly Ethylene ◽  
Coated Fertilizer ◽  
Polyurethane Matrix

AbstractNanocomposite modification has attracted much attention in improving properties of bio-based polymer coating material for coated fertilizer. Herein two comparable polyhedral oligomeric silsesquioxanes (POSS), with eight poly(ethylene glycol) (PEG) and octaphenyl groups attached to the cage, respectively, were successfully incorporated into thin castor oil-based polyurethane coatings via in-situ polymerization on the urea surface. The nanostructure coatings are environmentally friendly, easy to prepare, and property-tunable. The results show that the vertex group of POSS had a pronounced influence on dispersion level and interaction between polyurethane and POSS that well-tuned the release pattern and period of coated urea, even at the coating rate as low as of 2 wt%. The liquid POSS with long and flexible PEG groups had better compatibility and dispersibility in polyurethane matrix than the solid POSS with rigid octaphenyl groups, as evidenced by SEM/EDS. The unique properties were resulted from the different extents of physical crosslinkings. This modification of bio-based polyurethane coating with POSS provided an alternative method of regulating and controlling the properties of coated fertilizer.

Castor Oil Based Polyurethane Nanocomposites with Cellulose Nanocrystallites Fillers

2013 ◽  
Vol 856 ◽  
pp. 309-313 ◽  
Author(s):  
Anupama Kaushik ◽  
Alka Garg
Keyword(s):  
Mechanical Properties ◽  
Castor Oil ◽  
Barrier Properties ◽  
Filler Loading ◽  
Total Weight ◽  
High Shear ◽  
Homogeneous Dispersion ◽  
Cotton Linters ◽  
Polyurethane Nanocomposites ◽  
Polyurethane Matrix

In this study the castor oil based polyurethane (PU) nanocomposites were prepared by dispersing the cellulose nanocrystallites (CNC) isolated from cotton linters. CNC was dispersed in PU matrix using ultrasonicator coupled with high shear homogenizer. The filler loading was varied from 0-10% of the total weight of the mixture. The PU/CNC nanocomposites were characterized by SEM, XRD, FTIR, mechanical and barrier properties. SEM confirmed homogeneous dispersion of CNCs in polyurethane matrix with small agglomerates at certain places. Improvement in mechanical properties was observed as compared to neat PU. Diffusivity and permeability of the nanocomposites was reduced at higher loadings of CNC.

On the Photodegradation of Some 2H-Chromene Derivatives in Fluid Solution or in Polyurethane Matrix

2011 ◽  
Vol 84 (5) ◽  
pp. 552-561 ◽  
Author(s):  
Angelo Alberti ◽  
Mylène Campredon ◽  
Renaud Demadrille
Keyword(s):  
Fluid Solution ◽  
Polyurethane Matrix

Studies on Nanostructured Polyurethane/Clay Interpenetrating Polymer Networks

2005 ◽  
Vol 475-479 ◽  
pp. 1001-1004
Author(s):  
Ninglin Zhou ◽  
Xiao Xian Xia ◽  
Li Li ◽  
Shao Hua Wei ◽  
Jian Shen
Keyword(s):  
Mechanical Properties ◽  
Polymer Networks ◽  
Testing Machine ◽  
Physical And Mechanical Properties ◽  
Interpenetrating Polymer Networks ◽  
Absorption Properties ◽  
Tensile Testing Machine ◽  
Swelling Agent ◽  
Silicate Layers ◽  
Polyurethane Matrix

A novel exfoliated polyurethane (PU)/clay Interpenetrating Polymer Networks (IPNs) nanocomposite has been synthesized with polyurethane and organoclay. MTPAC is used as swelling agent to treat Na-montmorillonite for forming organoclay. The results indicate that there is very good compatibility between organoclay and PU. Nanoscale silicate dispersion was analyzed by XRD. The mechanical properties of the nanocomposites have been measured by tensile testing machine. The nanocomposites show obviously improved physical and mechanical properties when compared with the pure polymer. Additionally, PU /MTPAC- clay shows lower water absorption properties than pure PU do. In addition, the reinforcing and intercalating mechanism of silicate layers in polyurethane matrix are discussed.

scholarly journals Enhancing catalytic potential of gold nanoparticles by linear and cross-linked polyurethane blending

RSC Advances ◽  
2021 ◽  
Vol 11 (43) ◽  
pp. 26635-26643
Author(s):  
Amna Murtaza ◽  
Maliha Uroos ◽  
Misbah Sultan ◽  
Rabia Muazzam ◽  
Sadia Naz
Keyword(s):  
Gold Nanoparticles ◽  
Micro Particles ◽  
Catalytic Potential ◽  
Subsequent Stabilization ◽  
Polyurethane Matrix ◽  
Water Borne

This work describes the synthesis of gold nanoparticles (AuNPs) and their subsequent stabilization using a water-borne polyurethane matrix of micro-particles (Au/PU).

scholarly journals Cardiac controlled release for arrhythmia therapy: Lidocaine-polyurethane matrix studies

1988 ◽  
Vol 8 (2) ◽  
pp. 157-165 ◽  
Author(s):  
Amnon Sintov ◽  
William Scott ◽  
Macdonald Dick ◽  
Robert J. Levy
Keyword(s):  
Controlled Release ◽  
Arrhythmia Therapy ◽  
Polyurethane Matrix

scholarly journals Preparation of boron nitride nanosheets via polyethyleneimine assisted sand milling: towards thermal conductivity and insulation applications

RSC Advances ◽  
2021 ◽  
Vol 11 (61) ◽  
pp. 38374-38382
Author(s):  
Bing Wang ◽  
Haifeng Ji ◽  
Xiaojie Zhang ◽  
Xiongwei Qu
Keyword(s):  
Thermal Conductivity ◽  
Boron Nitride ◽  
Thermoplastic Polyurethane ◽  
Milling Process ◽  
Boron Nitride Nanosheets ◽  
Polyurethane Matrix

The PEI-grafted boron nitride nanosheets were successfully prepared via sand-milling process, which were doped into thermoplastic polyurethane matrix for better in-plane thermal conductivity while maintaining insulation properties.

Preparation of vinyl polymer/polyurethane hybrid latex particles and their application in nano-sized vinyl polymer particle/thermoplastic polyurethane blends

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Yanyan Wei ◽  
Chengzhong Zong ◽  
Fufang Wang
Keyword(s):  
Mechanical Properties ◽  
Thermoplastic Polyurethane ◽  
Polymer Particle ◽  
Gravimetric Analysis ◽  
Hybrid Particles ◽  
Scanning Calorimetry ◽  
Latex Particles ◽  
Vinyl Polymer ◽  
Hybrid Latex ◽  
Polyurethane Matrix

AbstractVinyl polymer/polyurethane hybrid latex particles with various compositions were successfully prepared via emulsion polymerization of vinyl monomer in the presence of self-emulsified polyurethane dispersion without using any surfactant. Studies were carried out on polymerization kinetics, characterization of the hybrid particles and the physical properties of nano-sized vinyl polymer particle/thermoplastic polyurethane blends. It was found that the maximum content of vinyl polymer in polyurethane hybrid particles was up to 80 percent and all of the vinyl polymer/polyurethane hybrid particles were less than 120 nm. Infrared spectroscopy, thermal gravimetric analysis and differential scanning calorimetry analysis indicated the influence of vinyl polymer on the polyurethane hybrid particles. With the polyurethane shells outside and, therefore, good compatibility with polyurethane matrix, the hybrid particles can be easily blended into polyurethane matrix. Some unusual changes of dynamic mechanical properties in the low temperature region were found in the blends of hybrid particles and thermoplastic polyurethane. With the addition of only 3%, the mechanical properties of these blends did not show a significant change. This study provided a new method to prepare hybrid particles in the absence of surfactant and made an attempt on application of vinyl polymer/polyurethane hybrid particles in the blending modification

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