scholarly journals Cellulose Stabilized Polyvinyl Acetate Emulsion: Review

2021 ◽  
Vol 11 (02) ◽  
pp. 51-66
Author(s):  
Pritam V. Dhawale ◽  
S. K. Vineeth ◽  
Ravindra V. Gadhave ◽  
Prakash A. Mahanwar
Keyword(s):  
Polyvinyl Acetate

The Modification of Paper with Polyvinyl Acetate by Beater Addition, Emulsion and Solution Saturation

1971 ◽  
Vol 25 (7) ◽  
pp. 371-383
Author(s):  
A.K.M. Lutfar Rahman ◽  
Mitsuo Fujii
Keyword(s):  
Polyvinyl Acetate

Influence of microwave processing on frame of films glues on an aqueous basis

2016 ◽  
Author(s):  
С.П. Исаев ◽  
К.А. Шевчук
Keyword(s):  
Electromagnetic Field ◽  
Microwave Radiation ◽  
Polyvinyl Acetate ◽  
Wood Quality ◽  
Microwave Processing ◽  
Phase Changes ◽  
Microwave Range ◽  
Adhesive Film ◽  
Modern Development ◽  
Experimental Researches

Современное развитие деревоперерабатывающей отрасли сопровождается существенным ростом объемов готовой продукции, производимой на основе клееной древесины. Качество выпускаемой клееной продукции во многом определяется свойствами применяемых клеев. Экспериментально исследовано влияние электромагнитного поля СВЧ-диапазона на структуру клеев, применяемых для склеивания древесины. Установлено, что СВЧ-обработка оказывает существенное влияние на микроструктуру поливинилацетатного клея Dorus 072. Структура клеевой пленки, обработанной СВЧ-излучением, имеет более высокую дисперсность, по сравнению с исходным полимером, которая выражается в среднем уменьшении глобул в 1,4 раза. Исследование фазового контраста пленки поливинилацетатного клея, обработанного СВЧ-излучением, позволило установить, что после обработки уменьшается фазовая неоднородность клеевой пленки и имеет место углубление дисперсности глобул полимера, приводящее к увеличению степени его упаковки с образованием однородной по структуре пленки. Экспериментальные исследования пленок карбамидоформальдегидного клея Dorus FU 406, подвергнутого СВЧ-обработке, показали, что структуры образцов пленок как обработанного, так и необработанного, клея не отличаются значительными изменениями. Исследование фазового сдвига по поверхности образца пленки карбамидоформальдегидного клея отражает распределение свойств материала и показывает, что СВЧ-обработка клея способствует образованию квазигомогенной структуры, формирование которой подтверждается уменьшением различий в границах фазовых переходов микроструктур отвержденного полимера. На основании проведенных экспериментов по исследованию структуры пленок клеев, применяемых для склеивания древесины, установлено, что в результате воздействия электромагнитного поля СВЧ-диапазона на клеевые растворы осуществляется нетепловая модификация, сопровождающаяся уменьшением размеров макромолекул полимера и формированием плотно упакованной структуры пленки. Полученные результаты позволяют сделать вывод о целесообразности дальнейших исследований по модификации клеев СВЧ-обработкой. Modern development of woodworking branches is accompanied by essential growth of volumes of the finished goods manufactured on the basis of glued wood. Quality of let out glued production in many respects is defined by properties of applied glues. Influence of an electromagnetic field of a microwave range on frame of the glues applied to coagglutination of wood is experimentally investigated. It is positioned that microwave processing makes essential impact on a microstructure of polyvinyl acetate glue Dorus 072. The frame of the adhesive film treated by microwave radiation, has higher dispersity in comparison with initial polymer which is expressed on the average reduction of globules in 1,4 times. Research of phase contrast of a film of the treated polyvinyl acetate glue by microwave radiation has allowed to position that after processing phase heterogeneity of an adhesive film decreases and the excavation of dispersity of globules of the polymer, leading to augmentation of degree of its packaging, forming an unimodal film on frame takes place. Experimental researches of films of amino-formaldehyde glue Dorus FU 406, subjected to microwave processing, have shown that Frames of samples of films both treated, and untreated glue do not differ significant changes. Research of phase alteration on a surface of the sample of a film of amino-formaldehyde glue reflects allocation of properties of a stuff and shows that glue microwave processing promotes formation of the quasi-homogeneous frame which formation proves to be true reduction of distinctions in borders of phase changes of microstructures hardning polymer. On the basis of the made experiments on research of frame of films of the glues applied to coagglutination of wood it is positioned that as a result of influence of an electromagnetic field of the microwave oven of a range on glutinous solutions not thermal modification accompanied by reduction of the dimensions of macromolecules of polymer and formation of densely packed frame of a film is carried out. The received results allow to draw a conclusion on expediency of the further researches on modification of glues by microwave processing.

Calcium phosphate/polyvinyl acetate coatings on SS304 via galvanic co-deposition for orthopedic implant applications

2021 ◽  
pp. 126771
Author(s):  
I. Mendolia ◽  
C. Zanca ◽  
F. Ganci ◽  
G. Conoscenti ◽  
F. Carfì Pavia ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Polyvinyl Acetate ◽  
Orthopedic Implant

scholarly journals Behavior under impact of two polyvinyl acetate-polyethylene (PVA-PE) polymers and one elastomer-application to custom-made mouthguards

2009 ◽  
Vol 28 (2) ◽  
pp. 170-177 ◽  
Author(s):  
Philippe POISSON ◽  
Philippe VIOT ◽  
Julien PETIT
Keyword(s):  
Polyvinyl Acetate ◽  
Custom Made

Quartz Crystal Microbalances Functionalized with Citric Acid-Doped Polyvinyl Acetate Nanofibers for Ammonia Sensing

2020 ◽  
Vol 3 (6) ◽  
pp. 5687-5697 ◽  
Author(s):  
Roto Roto ◽  
Aditya Rianjanu ◽  
Annisa Rahmawati ◽  
Innas Amaliya Fatyadi ◽  
Nursidik Yulianto ◽  
...  
Keyword(s):  
Citric Acid ◽  
Quartz Crystal ◽  
Polyvinyl Acetate ◽  
Ammonia Sensing ◽  
Quartz Crystal Microbalances

The Chemistry of the Active Molecules Formed in the Mechanical Degradation of Polymers

1957 ◽  
Vol 30 (4) ◽  
pp. 1162-1165
Author(s):  
A. A. Berlin
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Polyvinyl Acetate ◽  
Covalent Bond ◽  
Ultrasonic Waves ◽  
Mechanical Degradation ◽  
Specific Viscosity ◽  
Mechanical Destruction ◽  
Fluid State ◽  
Polymeric Chains

Abstract At the present time there is a multitude of data indicating that when polystyrene, natural rubber, polyvinyl acetate, cellulose, starch, proteins and other high molecular weight compounds are mechanically ground up, a degradation of the polymeric chains is observed. The mechanical scission of macromolecules during grinding in a colloid or ball mill, or when they are broken down on mill rolls, proceeds most rapidly at temperatures below the range of the viscous-fluid state, since under these conditions the forces of intermolecular interaction are considerably greater than the strength of the covalent bond. However, the mechanical destruction of macromolecules is also possible through certain mechanical effects acting on solutions of polymers. Thus, for instance, the force of friction generated in the flow of a 0.05% solution of polystyrene (Mcp=6×105) in tetralin through a platinum capillary is due to the scission of macromolecules, which brings about a 30% decrease in the specific viscosity. The significant gradients in the rate and in the forces of friction and cavitation developed in polymer solution through the action of ultrasonic waves with frequencies of the order of 200–300 kilocycles/sec. are due to the mechanical scission of macromolecules of polystyrene, rubber, polyvinyl acetate, cellulose and a number of other high molecular weight compounds.

Effect of polyvinyl acetate grout injection on geotechnical properties of fine sand

2012 ◽  
Vol 8 (2) ◽  
pp. 86-96 ◽  
Author(s):  
Rassoul Ajalloeian ◽  
Hossein Matinmanesh ◽  
Sayyed Mahdi Abtahi ◽  
Mohammadali Rowshanzamir
Keyword(s):  
Polyvinyl Acetate ◽  
Fine Sand ◽  
Geotechnical Properties ◽  
Grout Injection
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