scholarly journals Effect of Shellac Waterborne Coating Microcapsules on the Optical, Mechanical and Self-Healing Properties of Waterborne Primer on Tilia europaea L. Wood

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 785
Author(s):  
Xiaoxing Yan ◽  
Yu Tao ◽  
Yijuan Chang
Keyword(s):  
In Situ Polymerization ◽  
Paint Film ◽  
Waterborne Coating ◽  
Preparation Process ◽  
Self Healing ◽  
Melamine Formaldehyde ◽  
Comprehensive Performance ◽  
Aging Resistance

Microcapsules of melamine formaldehyde-coated shellac and waterborne coating were prepared by in situ polymerization at 400, 600, 800 and 1000 rpm. The microcapsules prepared at four different stirring rates were added into the waterborne primer at a concentration of 5.0%, 10.0%, 15.0%, 20.0% and 25.0%. The effects of microcapsules prepared at different stirring rates and the concentration of microcapsules added into the paint film on the optical, mechanical and liquid resistance properties of the paint film were investigated. The results showed that the comprehensive performance of Tilia europaea L. waterborne primer film was the best when the concentration of microcapsules obtained at 600 rpm was 5.0%. On this basis, the aging resistance and self-healing performance of waterborne primer film on Tilia europaea L. with the best comprehensive performance were explored to lay the foundation for optimizing the preparation process of self-healing coating.

Microencapsulation of Styrene/Epoxydiacrylate via In Situ Polymerization of Melamine-Formaldehyde

2011 ◽  
Vol 393-395 ◽  
pp. 1279-1282
Author(s):  
Hai Ping Wang
Keyword(s):  
In Situ Polymerization ◽  
Limited Range ◽  
Thermoplastic Composites ◽  
Resonance Spectroscopy ◽  
Self Healing ◽  
Melamine Formaldehyde ◽  
Core Content ◽  
Ft Ir ◽  
And Storage

Microcapsules containing the mixture of styrene and epoxydiacrylate (St/E51-AA) for use in self-healing thermoplastic composites were synthesized by in-situ polymerization using melamine-formaldehyde (MF) as shell materials. The microcapsules were prepared in two consecutive steps, emulsification of St/E51-AA in water and then, encapsulation. The chemical structure of microcapsule was identified by Fourier transform infrared spectroscopy (FT-IR) and proton magnetic resonance spectroscopy (1H-NMR), respectively. Morphology and shell wall thickness of microcapsule were observed using scanning electron microscope (SEM). The effect of dispersion rates, through a limited range, was carefully examined on the particle size and core content of microcapsules. It was found that styrene/ epoxydiacrylate-loaded microcapsules were successfully prepared through the proposed technical route, and their mean diameters fell in the range of 36~110 μm. Both core content and microcapsule size can be adjusted by selecting different dispersion rates. The highest loading of St/E51-AA in the resultant microcapsules can be about 85%. In terms of thermogravimetric analysis (TGA), thermal behavior and storage stability of the capsules were studied.

The Preparation of Microcapsules Used for Self-Healing Composites

2011 ◽  
Vol 233-235 ◽  
pp. 2319-2322 ◽  
Author(s):  
Ru Tian ◽  
Yu Dong Zheng ◽  
Xin Liang ◽  
Zhang Ming Zhou ◽  
Xiao Li Fu ◽  
...  
Keyword(s):  
In Situ Polymerization ◽  
Ph Value ◽  
Condensation Reaction ◽  
Formaldehyde Resin ◽  
Self Healing ◽  
Mass Ratio ◽  
Melamine Formaldehyde ◽  
Stirring Rate ◽  
The Stability

Microcapsules were prepared by in situ polymerization of melamine-formaldehyde resin to form shell over oxygen resin droplets. Stirring rate, temperature, pH value as well as mass ratio of shell and core are the main parameters affecting the stability of microcapsules. High stirring rate leads to small size of microcapsules. The temperature influences the speed of the reaction and the morphology. The pH value decides whether the condensation reaction can take place. The size of microcapsules is about 15-61um.

scholarly journals Microencapsulation of Liquid Cyanoacrylate via In Situ Polymerization for Self-healing Bone Cement Application – ERRATUM

2012 ◽  
Vol 1417 ◽  
pp. 1-13
Author(s):  
Vineela D. Gandham ◽  
Alice B.W. Brochu ◽  
William M. Reichert
Keyword(s):  
Bone Cement ◽  
In Situ Polymerization ◽  
Self Healing ◽  
Healing Bone

scholarly journals Effect of Urea-Formaldehyde (UF) with Waterborne Emulsion Microcapsules on Properties of Waterborne Acrylic Coatings Based on Coating Process for American Lime

2020 ◽  
Vol 10 (18) ◽  
pp. 6341 ◽  
Author(s):  
Xiaoxing Yan ◽  
Wenting Zhao ◽  
Xingyu Qian
Keyword(s):  
Urea Formaldehyde ◽  
Paint Film ◽  
Coating Process ◽  
Self Healing ◽  
Waterborne Coatings ◽  
Aging Resistance ◽  
Acrylic Coatings ◽  
Waterborne Emulsion ◽  
The Impact ◽  
Good Coating

The purpose of this paper is to explore the effect of urea-formaldehyde (UF) with waterborne emulsion microcapsules on the optical, mechanical and aging resistance properties of waterborne coatings from the perspective of coating process. In this paper, the microcapsules were prepared with UF resin as the wall materials and waterborne emulsion as the core materials. Based on the coating process, the optical, mechanical and aging resistance properties of the waterborne acrylic coatings with microcapsules for American lime were tested. The good coating process is three layers of primer, two layers of topcoat, and adding microcapsules into primer. The results showed that the coating process had little effect on the color difference of the paint film with microcapsules, the gloss of the paint film prepared by the good coating process was basically not changed, and the mechanical properties of the paint film were good. At this time, the hardness grade of the paint film was 3H, the adhesion was grade 0, the impact resistance was 110.0 N·cm−2, and the elongation at break was 29.7%. The microcapsules added to the primer had better liquid resistance than those added to the topcoat. The paint film had good stability and aging resistance, and could inhibit the generation of microcracks to a certain extent. The paint film prepared by the good coating process had better comprehensive performance. This work provides a technical reference for self-healing of the waterborne coatings on American lime.

Microencapsulation of Epoxy Resins for Self-Healing Material

2010 ◽  
Vol 148-149 ◽  
pp. 1031-1035
Author(s):  
Yang Zhao ◽  
Wei Zhang ◽  
Le Ping Liao ◽  
Wu Jun Li ◽  
Yi Xin
Keyword(s):  
Epoxy Resins ◽  
In Situ Polymerization ◽  
Heating Temperature ◽  
Hot Water ◽  
Core Material ◽  
Agitation Rate ◽  
Self Healing ◽  
Water Emulsion ◽  
Oil In Water Emulsion

With the development of the embedded microcapsule concept for self-healing material, the preparation of microcapsule has been paid more attentions. A new series of microcapsules were prepared by in situ polymerization technology in an oil-in-water emulsion with polyoxymethylene urea (PMU) as shell material and a mixture of epoxy resins as core material. The PMU microcapsules were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electronic microscopy (SEM), particle size analyzer and thermo gravimetric analyzer (TGA) to investigate their chemical structure, surface morphology, size distribution and thermal stability, respectively. The results indicate that PMU microcapsules containing epoxy resins can be synthesized successfully. The optimized reaction parameters were obtained as follow: agitation rate 600 rpm, 60°C water bath, pH=3.5, core material 20ml and hot water dilution by in-situ polymerization. The size is around 116 μm. The rough outer surface of microcapsule is composed of agglomerated PMU nanoparticles. The microcapsules basically exhibit good storage stability at room temperature, and they are chemically stable before the heating temperature is up to approximately 200°C.

An Easy Preparation of Hybrid SiO2@Poly Acrylic Acid Nanoparticles

2013 ◽  
Vol 475-476 ◽  
pp. 1340-1343
Author(s):  
Hai Wang Wang ◽  
Xiu Juan Ding ◽  
Jie Sun ◽  
Jin Peng Luan
Keyword(s):  
Acrylic Acid ◽  
High Performance ◽  
In Situ Polymerization ◽  
Polymer Materials ◽  
Performance Ratio ◽  
Nanometer Materials ◽  
Transmission Electron ◽  
Comprehensive Performance ◽  
Nanometer Particles

Nanometer materials are widely used in the modification of polymer materials such as polypropylene because of its unique performance. nanocomposite material,which expended the application field of polymer ,is a kind of new composite materials with high performance ratio and widely application prospect .This paper adopted the surface-initiated technology to coat and modify the surface of nanosilica,which solved the problem of the agglomeration and interface compatibility of the nanometer particles and improved its dispersion in the acrylic acid,then prepared SiO2/PAA nanocomposite .The composite was characterized by infrared spectrum and transmission electron microscopy (TEM) ,etc.The research results showed that the nanocomposite prepared by in-situ polymerization technology had higher toughness ,strength and more excellent comprehensive performance.

Reusable Self-Healing Hydrogels Realized via in Situ Polymerization

2015 ◽  
Vol 119 (14) ◽  
pp. 4881-4887 ◽  
Author(s):  
Balachandran Vivek ◽  
Edamana Prasad
Keyword(s):  
In Situ Polymerization ◽  
Self Healing

scholarly journals Multi Self-Healable UV Shielding Polyurethane/CeO2 Protective Coating: The Effect of Low-Molecular-Weight Polyols

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1947
Author(s):  
Mohammad Mizanur Rahman ◽  
Rami Suleiman ◽  
Md. Hasan Zahir ◽  
Aasif Helal ◽  
A. Madhan Kumar ◽  
...  
Keyword(s):  
Molecular Weight ◽  
In Situ Polymerization ◽  
Outdoor Exposure ◽  
Low Molecular Weight ◽  
Self Healing ◽  
Polydimethyl Siloxane ◽  
Molecular Weights ◽  
Uv Shielding ◽  
Ceo2 Coating

We prepared a series of polyurethane (PU) coatings with defined contents using poly(tetramethylene oxide)glycol (PTMG) with two different molecular weights (i.e., Mn = 2000 and 650), as well as polydimethyl siloxane (PDMS) with a molecular weight of Mn 550. For every coating, maximum adhesive strength and excellent self-healing character (three times) were found using 6.775 mol% mixed with low-molecular-weight-based polyols (PU-11-3-3). Defined 1.0 wt% CeO2 was also used for the PU-11-3-3 coating (i.e., PU-11-3-3-CeO2) to obtain UV shielding properties. Both the in situ polymerization and blending processes were separately applied during the preparation of the PU-11-3-3-CeO2 coating dispersion. The in situ polymerization-based coating (i.e., PU-11-3-3-CeO2-P) showed similar self-healing properties. The PU-11-3-3-CeO2-P coating also showed excellent UV shielding in real outdoor exposure conditions.

scholarly journals Self-Healing EPDM Rubbers with Highly Stable and Mechanically-Enhanced Urea-Formaldehyde (UF) Microcapsules Prepared by Multi-Step In Situ Polymerization

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1918 ◽  
Author(s):  
Hyeong-Jun Jeoung ◽  
Kun Won Kim ◽  
Yong Jun Chang ◽  
Yong Chae Jung ◽  
Hyunchul Ku ◽  
...  
Keyword(s):  
Mechanical Stability ◽  
In Situ Polymerization ◽  
Urea Formaldehyde ◽  
Testing Machine ◽  
Optical Microscope ◽  
The Self ◽  
Self Healing ◽  
Grubbs Catalyst ◽  
Healing Efficiency

The mechanically-enhanced urea-formaldehyde (UF) microcapsules are developed through a multi-step in situ polymerization method. Optical microscope (OM) and field emission scanning electron microscope (FE-SEM) prove that the microcapsules, 147.4 μm in diameter with a shell thickness of 600 nm, are well-formed. From 1H-nuclear magnetic resonance (1H-NMR) analysis, we found that dicyclopentadiene (DCPD), a self-healing agent encapsulated by the microcapsules, occupies ca. 40.3 %(v/v) of the internal volume of a single capsule. These microcapsules are mixed with EPDM (ethylene-propylene-diene-monomer) and Grubbs’ catalyst via a solution mixing method, and universal testing machine (UTM) tests show that the composites with mechanically-enhanced microcapsules has ca. 47% higher toughness than the composites with conventionally prepared UF microcapsules, which is attributed to the improved mechanical stability of the microcapsule. When the EPDM/microcapsule rubber composites are notched, Fourier-transform infrared (FT-IR) spectroscopy shows that DCPD leaks from the broken microcapsule to the damaged site and flows to fill the notched valley, and self-heals as it is cured by Grubbs’ catalyst. The self-healing efficiency depends on the capsule concentration in the EPDM matrix. However, the self-healed EPDM/microcapsule rubber composite with over 15 wt% microcapsule shows an almost full recovery of the mechanical strength and 100% healing efficiency.

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