These high molecular weight, film-forming polymers were obtained from metal-free, superacid-catalyzed reactions of the monomers with N-phenylisatin.
High molecular weight film-forming semicrystalline aromatic polyketones with a regular structure were obtained by precipitation electrophilic Friedel-Crafts polycondensation of 2,6-naphthalenedicarboxylic acid chloride with diphenyl ether, 1,4-bis p-phenoxy) benzophenone and 1,4-bis p-phenoxybenzoyl) benzene.
High molecular weight film-forming flexible fluorinated poly arylene ether benzoxazole)s, which are suitable as gas separation membranes, adhesives and matrix resins, were synthesized in aprotic dipolar solvents such as N-methyl pyrrolidinone via an intermediate poly(hydroxy amide).
Superpressure balloons fabricated from strong, light-weight films offer the possibility for an observational platform that can accommodate scientific instruments up to 1 ton for 100 days at altitudes above 99.5% of the Earth's atmosphere.
Nonetheless, one obvious limitation of the use of the PCA is that it leads to lose of information due to summary coding of responses but this was necessary for easy interpretation of the weights (Filmer and Pritchett 2001).
The self-healing properties of biological hydroxypropyl methylcellulose (HPMC) high-molecular weight thin films were investigated.
Herein, granular HCP-(CoCrPt 100−X(Al2O3 X (X represents the percent weight) thin films with Si(1 0 0) substrates have been fabricated using sputtering technique followed by annealing treatment.
This is followed by rapid propagation reactions of free radicals through monomer to generate high molecular weight polymer films on the surface.
Not only were its viewfinder system and controls unsuitable for feature film crews, but the weight of film production lenses was enough to rip the front off the camera.
Thus, the experiment was carried out until equilibrium was attained and the water uptake ability was determined according to the equation: water uptake = (WWET − WDRY /WDRY × 100%%; where, WWET = weight of film after water uptake and WDRY = initial dry weight of the film.
kern-0pt} {W_{text{i}} }} times 100, where W i was the initial weight of film expressed as dry matter and W f was the weight of the undissolved desiccated film residue.
