Modified silyl-terminated polyether
polymer blends with bisphenol A diglycidyl ether epoxy for adhesive applications.
The combination of hydrophilic polyether
and hydrophobic silicone macromonomers has resulted in the development of leveling additives that offer improved overcoatability and leveling, and also anti-cratering performance.
Nissan et al explained that this expansion was due to the environmental factors as the polyether
material (Impregum) expanded during storage.28 Megremis et al reported alteration in dimensions of an impression material because of storage temperature and humidity factor.29 During 24 hours storage period average ambient humidity was 63.6%.
Europe is the global leader in the consumption of polyether
ether ketone (PEEK) and this dominance is expected to continue till 2020.
Foaming agents, including a catalyst, a surfactant and the blowing agent, were added to the blends of (polyether
diol) and stirred at 2500 rpm for 20 s.
Taken as a whole, there is no significant difference between thermal stability of polyester based and polyether
based elastomers, nevertheless initiation of degradation is slightly earlier in polyether
based elastomers, this difference may bebecause of relatively higher degree of secondary forces in polyester based elastomers as observed in the case of mechanical properties also.Thermal behavior of PUU elastomers was also investigated by DSC, results are presented in Table-3 and Fig.
amine (Jeffamine D230) and other chemical reagents nitric acid (68%), concentrated HCl (37%), concentrated sulfuric acid (98%), and tetrahydrofuran (THF, 95%) were analytically pure and purchased from Sigma-Aldrich Co.
The introduction of the soft polyether
segments also led to the reduction of melting point of the polymers.
Their result details how a soil bacterium, Streptomyces lasaliensis, is able to convert an epoxide into a six-membered cyclic ether during synthesis of lasalocid, a natural polyether
is subjected to a catalyzed reaction with an alkyl polyether
[R.sup.1]--H], [R.sup.7]--OH being split off, the molar ratio of the alkyl polyethers
[R.sup.1]--H to the silane of the formula II is at least 0.5 and [R.sup.7]--OH is separated off from the reaction mixture continuously or discontinuously.
The driving forces behind this increased popularity are the superior performance and environmental compliance characteristics of polyether
based sealants and adhesives compared with many urethane- and silicone-type products.
A combination of dimensional stability and processability uncharacteristic of high temperature resistant thermoplastics is claimed for a new grade of Ultrason polyether
sulphone from BASF.