Synthesis and Properties of Melamine-Formaldehyde/Montmorillonite Nanocomposites

2008 ◽  
Vol 8 (4) ◽  
pp. 1775-1781 ◽  
Author(s):  
Haitao Wang ◽  
Xiangfu Meng ◽  
Zhongzhong Qian ◽  
Hu Zhou ◽  
Yanfen Ding ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Raman Spectroscopy ◽  
Chemical Resistance ◽  
Formaldehyde Resin ◽  
Polycondensation Reaction ◽  
Melamine Formaldehyde ◽  
Formaldehyde Content ◽  
Acetyl Acetone ◽  
Modified Montmorillonite

In this paper, intercalated and partially exfoliated melamine-formaldehyde (MF)/montmorillonite (MMT) nanocomposites have been synthesized successfully via in-situ polymerization based on pristine montmorillonite, acidified montmorillonite and organic modified montmorillonite respectively. The obtained nanocomposites were characterized by XRD, TEM, TGA, and Raman spectroscopy. Free formaldehyde content of those composites was also determined by acetyl acetone technique. It was found that acidified montmorillonite and organic modified montmorillonite could catalyze the polycondensation reaction of methylolmelamines. The thermal stability and chemical resistance of those two nanocomposites were also improved dramatically compared to pure melamine-formaldehyde resin.

Preparation of High Security N-Octadecane MicroPCMs by In Situ Polymerization

2015 ◽  
Vol 727-728 ◽  
pp. 141-144
Author(s):  
Xiao Qiu Song ◽  
Yu Ping Duan ◽  
Yue Xia Li
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Urea Formaldehyde ◽  
Functional Materials ◽  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Formaldehyde Content ◽  
Synthesis Conditions ◽  
Polymerization Method

N-octadecane microcapsules phase change materials(MicroPCMs) were prepared by thein-situ polymerization method using n-octadecane as core materials, urea-formaldehyde resin as shellmaterials respectively. Melamine–formaldehyde (MF) microcapsules have been widely applied inmany functional materials. Free formaldehyde content are important safetyfactor determining the survival of the microcapsules during fabrication andapplication. In this study, the formaldehyde content of n-octadecane MicroPCMs decrease to 0.35g/Kg which even lower than the standard EuropeanE3 level (0.6g/Kg) through regulation the synthesis conditions such as urea/formaldehyderatio of weight from 1:2 to 1:1.6, urea batch feeding three times ,curing endpH value to 1.0-1.5,reactive time extend to 4h,addition melamine and PVA.

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.

Synthesis Characterization and Glass Reinforcement of Poly(urethane-imide)s-III

1992 ◽  
Vol 4 (4) ◽  
pp. 247-257 ◽  
Author(s):  
Hasmukh S. Patel ◽  
Vipul J. Shah ◽  
Hemant S. Vyas
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Chemical Resistance ◽  
Fibre Composite ◽  
Diels Alder ◽  
Spectral Studies ◽  
Intermolecular Reaction ◽  
Glass Reinforcement ◽  
Glass Fibre Composite

Poly(urethane-imide)s (PUIs) were prepared by the intermolecular Diels-Alder (DA) reaction of methylenedi-4,1-phenylenebis(2-furanyl-methylcarb-amate) (MPBFC) with various bismaleimides. The DA reaction was carried out in 1,4-dioxane as solvent as well as in bulk, followed by aromatization of tetrahydro-phthalimide intermediates in the presence of acetic anhydride. All the polymers were characterized by elemental analysis, IR spectral studies and thermogravfmetry. The PUts exhibit moderate thermal stability. MPBFC and bismaleimides were polymerized (at 145 + 10 C) by an in situ DA intermolecular reaction into moderately thermally stable PUls-glass fibre composite (i.e. laminates) and were characterized by their chemical resistance and mechanical properties.

scholarly journals Preparation and characterization of waterborne alkyd-amino baking coatings based on waste polyethylene terephthalate

2020 ◽  
Vol 7 (1) ◽  
pp. 191447
Author(s):  
Xia Yun ◽  
Yang Xin-yi ◽  
Gong Dun-hong ◽  
Ding Yong-bo ◽  
Shen Liang
Keyword(s):  
Polyethylene Terephthalate ◽  
Chemical Resistance ◽  
Alkali Resistance ◽  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Pet Waste ◽  
Amino Resin ◽  
Excellent Adhesion ◽  
Hydrolysis Of

The recycling of polyethylene terephthalate (PET) is the most attractive method for PET waste management because it not only decreases the load on landfill space, but also provides opportunities for reducing the use of raw petrochemical products. Therefore, in this investigation, neopentyl glycol is used for alcoholysis of waste PET, and glycolyzed PET product was applied for preparation of the waterborne alkyd resin. Furthermore, the waterborne alkyd-amino baking coatings were prepared from the waterborne alkyd based on glycolyzed waste PET and melamine formaldehyde resin and applied on tinplate. The waterborne alkyd-amino resin films showed excellent adhesion, balanced hardness and flexibility, high gloss and outstanding chemical resistance except for alkali resistance owing to hydrolysis of ester bonds.

scholarly journals Development and Assessment of Polymeric Laminate Blended Composites Reinforced with Bi-Woven Aramidic Fiber

2014 ◽  
Vol 38 ◽  
pp. 99-110
Author(s):  
B. Amarababu ◽  
V. Pandu Rangadu
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Chemical Resistance ◽  
In Situ Polymerization ◽  
Flexural Modulus ◽  
Tensile Modulus ◽  
Solid Material ◽  
Layer 2 ◽  
Layer 4

In the present paper evaluates laminated aramidic bi-woven fibers reinforced in polyester-vinylester blended composites. The Duo polymers, polyester-vinylester were blended using in situ polymerization technique. Four planar layers were made simultaneously and keeping one over another and each layer make sure to be weighed off 15% were maintained in all layers with different orientations. Pre-assumed Layer-1(50/50) 50 %, 0º; Layer-2(35/35/30) 35 % 0º, 35 % +45º, 30 %,0; Layer-3 (25/50/25) 25 % 0º, 50% +45º, 25-45º; Layer-4 (25/25/25/25) (2 5% 0º, 25 % +45º, 25 % -45º, 25 % 90º). Tthe composite was prepared with the help of hand layup technique. Test ready specimens were the help of shearing machine in accordance with ASTM. It was observed that, polyester and vinylester had good miscibility makes combined solid material. Flexural strength, tensile strength was improved up to 3ed layer, decreases after, whereas flexural modulus and tensile modulus were linearly increased up to 4th layer. Thermal stability and glass transition temperature were also found satisfactory for all the laminated layers. Chemical resistance was good for the entire chemical except toluene.

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