scholarly journals Effect of telechelic ionic groups on the dispersion of organically modified clays in bisphenol A polycarbonate nanocomposites by in-situ polymerization using activated carbonates

2017 ◽  
Vol 11 (5) ◽  
pp. 396-405 ◽  
Author(s):  
M. Colonna ◽  
F. Acquasanta ◽  
C. Gioia ◽  
A. Celli
Keyword(s):  
Bisphenol A ◽  
In Situ Polymerization ◽  
Bisphenol A Polycarbonate ◽  
Modified Clays ◽  
Ionic Groups ◽  
Organically Modified

Research on Performance of Polyimide In Situ Modification Anionic Polymerization Nylon 6

2014 ◽  
Vol 1052 ◽  
pp. 242-248
Author(s):  
Hong Kai Zhao ◽  
Hong Li Wang
Keyword(s):  
Bisphenol A ◽  
Water Absorption ◽  
In Situ Polymerization ◽  
Microscopic Analysis ◽  
Nylon 6 ◽  
Grafting Reaction ◽  
Lamellar Crystals ◽  
End Capping ◽  
Short Time

Through the polymerization and grafting reaction of bisphenol A dianhydride and bisphenol A diamine, the polyimide activator (PI activator) of acyl caprolactam end capping is obtained and then the anionic in-situ polymerization modified nylon 6 resin is obtained. Viscosity analysis shows that PI consumption is higher than 0.1 (of monomer mass), the reaction temperature is higher than 160°C, the viscosity rises rapidly in a short time and the rapid polymerization molding can be realized; when PI consumption is higher than 0.15 (of monomer mass), the water absorption of matrix resin will be lower than 1.4%; compared with the nylon resin, its water absorption is significantly lowered and its mechanical property is improved greatly; microscopic analysis shows that PI molecules fail to enter the crystalline phase of the nylon 6 and form lamellar crystals in the nylon matrix, which plays a role of enhancement and obstruction; differential thermal analysis shows that PI reduces the melting enthalpy and melting point temperature of nylon 6 resin, which indicates that PI reduces the crystallization capacity of nylon 6.

In Situ Polymerization of PET in the Presence of Pristine and Organo-modified Clays

2013 ◽  
Vol 28 (3) ◽  
pp. 331-340 ◽  
Author(s):  
B. Esmaeili ◽  
C. Dubois ◽  
P. J. Carreau ◽  
M.-C. Heuzey
Keyword(s):  
In Situ Polymerization ◽  
Modified Clays

Irradiation of poly(vinyl ester)/clay nanocomposites

2017 ◽  
Vol 52 (1) ◽  
pp. 17-25 ◽  
Author(s):  
Ahmad Mohaddespour ◽  
Seyed J Ahmadi ◽  
Hossein Abolghassemi ◽  
Seyed M Mahjoub ◽  
Saeid Atashrouz
Keyword(s):  
Vinyl Ester ◽  
In Situ Polymerization ◽  
Surface Hardness ◽  
Clay Nanocomposites ◽  
Mechanical And Thermal Properties ◽  
X Ray Diffraction ◽  
Transition Electron Microscopy ◽  
Organically Modified ◽  
Polymerization Method

The effect of electron beam irradiation on pristine poly(vinyl ester) and cured poly(vinyl ester)/clay nanocomposite with different clay contents is studied at irradiation doses ranging from 100 to 1000 kGy at room temperature. Poly(vinyl ester)/clay nanocomposites were prepared with different amounts of organically modified montmorillonite (1, 3, and 5 wt.%) by in situ polymerization method. Morphology properties of synthesized nanocomposites were studied by X-ray diffraction and transition electron microscopy. The irradiation dose up to 500 kGy yields an increase in Young’s modulus and tensile strength of nanocomposites while further irradiation deteriorates the mechanical strength of samples. Irradiation has no considerable influence on the surface hardness of synthesized nanocomposites. Thermogravimetric analysis results reveal the thermal stability of poly(vinyl ester), and its nanocomposites is improved with irradiation up to 500 kGy. However, similar to mechanical perdition at 1000 kGy irradiation, thermal resistance of nanocomposites decreases. The enhancement in mechanical and thermal properties of synthesized nanocomposites is attributed to the cross-linking effect as bonds can be formed directly between the neighbouring chains.

Structure-Property Studies on a Series of Polycarbonate-Polydimethylsiloxane Block Copolymers

1980 ◽  
Vol 53 (5) ◽  
pp. 1160-1169 ◽  
Author(s):  
S. H. Tang ◽  
E. A. Meinecke ◽  
J. S. Riffle ◽  
J. E. McGrath
Keyword(s):  
Block Copolymers ◽  
Bisphenol A ◽  
Elevated Temperatures ◽  
In Situ Polymerization ◽  
Soft Segment ◽  
Thermoplastic Elastomers ◽  
Structure Property ◽  
Polydimethyl Siloxane ◽  
Bisphenol A Polycarbonate ◽  
Siloxane Oligomers

Abstract Block copolymers composed of hard and soft segments form an interesting class of materials ranging from thermoplastics to thermoplastic elastomers depending on their composition and/or the size of segments. These materials have attracted much attention in the past decade because by careful tailoring, polymers of desired properties can be obtained. Yet they are thermoplastic in nature and can be processed and even reprocessed thermally. Among the common elastomers that can be used as the soft segment in a block copolymer, polydimethyl-siloxane is of special interest due to its great thermal stability at elevated temperatures and high flexibility at low temperatures. Block copolymers containing polydimethylsiloxane as the soft segment and various thermoplastics such as poly(α-methylstyrene), polystyrene, and polysulfone, etc., as the hard segment, have been synthesized and studied. A group of randomly alternating block copolymers of bisphenol-A polycarbonate and polydimethylsiloxane have also been prepared by in situ polymerization of dichloro-terminated siloxane oligomers and bisphenol-A and phosgene. The properties of these block copolymers as well as those of the others have been discussed to some extent in a general review. This work reports the results of a study on the structure-property relationship of a series of perfectly alternating block copolymers of bisphenol-A polycarbonate and polydimethylsiloxane synthesized via different routes. They were prepared by silylamine-hydroxyl reaction. Slightly less than the stoichiometric quantity of siloxane oligomers was incrementally added to a hydrated solution of the polycarbonate in refluxing chlorobenzene. The reaction can be represented by the simple scheme:

Removal of bisphenol A by adsorption on organically modified clays from Burkina Faso

2020 ◽  
pp. 1-26
Author(s):  
Issaka Garikoé ◽  
Brahima Sorgho ◽  
Adama Yaméogo ◽  
Boubié Guel ◽  
Dickson Andala
Keyword(s):  
Bisphenol A ◽  
Burkina Faso ◽  
Modified Clays ◽  
Organically Modified
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