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Effect of Curing Time and Temperature on the Structural Stability of Melamine Formaldehyde Polymers Phisan Katekomol Faculty of Science, Department of Chemistry, Naresuan University, Tha-Pho, Phitsanulok, Thailand, 65000 phisank@nu.ac.th Keywords: melamine-formaldehyde, melamine resins, curing temperature, curing time Abstract.
The curing time also has some effect on the structure of the resulting polymer network as shown in Fig. 6.
Acknowledgement The author would like to cordially thank the department of Chemistry, Naresuan University for all the help it provides.
Amornrat Muangon from the department of chemistry, Naresuan University and to Dr.
Rapipan Janmanee from the department of chemistry, Pibulsongkram Rajabhat University for all their helps and encouragements.

Study on New 3-(2H)-Pyridazinones derivtives HongSen Li*, LinJin Zhao, JiaRong Tang, YiZhe Cheng, Jie Chen, ZhiYi Zheng, HaiLin Sun College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China ,lihongsen19@163.com Keywords: pyridazinone; synthesis; insecticide activities Abstract: A series of novel pyridazinone derivatives was designed and synthesized.
Introduction The chemistry of pyridazinones has been an interesting field of study since decade.
Results and discussion Chemistry The novel N-acetophenonel-5-amide-4-chloro-pyridazinone derivatives were synthesized by the reaction of piperidine or morpholine with N-acetophenonel-5-chloro -pyridazinone in methnol using pot -assium carbonate as acid acceptor.
Structure-activity relationship analysis of all of these 3 (2H) - pyridazinon es revealed that the substitutent of benzene ring affect the activity.
Bioorganic & Medicinal Chemistry, 2008, 16, 488–494

These substances make up semiconductors with an electronic band structure that clearly distinguishes between the lowest unoccupied band, the conduction band (CB), which is defined by an energy band gap, and the highest occupied energy band, the valence band (VB) (Eg) [9Within the semiconductor's particles, electron–hole pairs are created when photons with energy equal to or greater than the band gap are absorbed.
Reference Module in Chemistry, Molecular Sciences and Chemical Engineering, Encyclopedia of Interfacial Chemistry: Surface Science and Electrochemistry, pp.1-10. doi.org/10.1016/B978-0-12-409547-2.14127-7
Reference Module in Chemistry, Molecular Sciences and Chemical Engineering, Encyclopedia of Interfacial Chemistry: Surface Science and Electrochemistry. 2017:1-0. doi.org/10.1016/B978-0-12-409547-2.14127-7

It can be seen from the Fig.1a, PAN fiber has smooth surface of ravines and compact structure.
The surface of PAN fiber coated by collagen could provide good handling and durability and the supramolecular structure didn’t change significantly, which were associated with sedimentary and covalent binding of collagen molecules on the surface of PAN fiber.
Fiber Chemistry.
Journal of macromolecular science-reviews in macromolecular chemistry and physics, Vol.40(2000), p. 105.

Highly filled building materials reduced Flammability Bruyako Mihail Gerasimovich1, Grigorieva Larisa Stanislavovna2 1Doctor of Technical Sciences, The Department of Composite Materials Technology and Applied Chemistry, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation 2Doctor of Chemical Sciences, The Department of Composite Materials Technology and Applied Chemistry, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation pehel@yandex.ru Keywords: cellulose municipal solid waste (CMSW), flammability, gypsum binders, high-building material, Flame Retardants, Oxygen Index Abstract.
Investigation of physical and technical characteristics and optimization of formulations filled with gypsum compositions in International collection of scientific papers "Improving the quality of building materials and structures (models, structures, properties, exploitation Zion resistance)."

For the present study, we select low cost and easy method namely combustion synthesis to prepare varying concentration of Gd3+ was doped in BaAl2O4 phosphor and study the photoluminescence measurements for emission spectra and XRD study for the crystal structure and size.
Results and Discussion X-ray diffraction (XRD) Measurements The crystal structure of Gd3+ samples was examined from XRD patterns.
Wang, Bitao Liu, Jidi Liu, J. of Physics and Chemistry of Solids ,72 (2011) 995-1001
[5] Heesun Yang`, Dong-Kyoon Lee, Yong-Seog Kim, Materials Chemistry and Physics 114 (2009) 665–669

The microemulsion droplet can be an oil swelling particle dispersed in water (O/W microemulsion) or a water swelling particle dispersed in oil (W/O) microemulsion or a random structure of disorder [4-5].
Mechanism of formation and structure of microemulsions by electron microscopy [J].
Journal of physical chemistry. 1959, 63(10):1677-1680
Journal of agricultural and food chemistry. 2013, 61: 3654-3660.

Titanium dioxide replicated pollen grains’ hierarchical porous structures faithfully.
TEM confirmed the hollow and porous structures (Figure3(e)).
The highly porous mesoporous structure was consistent with the TEM observation.
K.; Lorke, M.; Frauenheim, T.; Deák, P., The Journal of Physical Chemistry C 2021
M.; Zhang, D., Journal of Materials Chemistry 2012, 22 (3), 1121-1126

The comparable study of the structure and structure-sensitive properties of the melt of steel 08H15N5D2T and two melts prepared by electro-slag re-melting (ESR) and vacuum-arc re-melting (VAR) of the steel has been carried out.
The reasons for the appearance of the difference in the structure and properties of ESR and VAR steel are discussed.
It can be assumed that the ESR melt of the steel has a more homogeneous structure.
The VAR melt structure is inhomogeneous and is not in equilibrium. 3.
Geld, Physical chemistry of pyrometallurgical processes, Moscow: Metallurgiya, part II, 1966

The focus of the investigations was on the influence of the thermal(1) or the acidic(2) activation on the structure and properties of the materials.
Introduction Geopolymers are well-known as alkali activated aluminosilicates forming an inorganic polymer network with advantageous binder properties in the application field of building chemistry.
Furthermore, the structure of the iron-phosphate networks depend remarkably on the PA/W ratio realized in the preparation.
Van Denventer: Geopolymers, Structure Processing, Properties and Industrial Applications, CRD Press, Woodhead Publ., Oxford, 2009, p. 3 [2] H.
Davidovits: Geopolymer, Chemistry and Applications (Institute Geopolymere, Saint-Quentin, France, 2008), p. 30 [7] W.