Polymerization of polyaniline under various concentrations of ammonium peroxydisulfate and hydrochloric acid by ultrasonic irradiation

2021 ◽  
Vol 138 (27) ◽  
pp. 50637
Author(s):  
Xuefeng Zheng ◽  
M. E. Ali Mohsin ◽  
Agus Arsad ◽  
Azman Hassan
Keyword(s):  
Hydrochloric Acid ◽  
Ultrasonic Irradiation ◽  
Ammonium Peroxydisulfate

Poly(2-bromoaniline) and Its Colloidal Dispersions

2002 ◽  
Vol 67 (3) ◽  
pp. 393-404 ◽  
Author(s):  
Jaroslav Stejskal ◽  
Miroslava Trchová ◽  
Jan Prokeš
Keyword(s):  
Hydrochloric Acid ◽  
Vinyl Alcohol ◽  
Colloidal Silica ◽  
Molar Mass ◽  
Hydroxypropyl Cellulose ◽  
Colloidal Dispersions ◽  
Poly Vinyl Alcohol ◽  
Average Molar Mass ◽  
Ammonium Peroxydisulfate ◽  
Polymeric Stabilizer

Poly(2-bromoaniline) was prepared by oxidation of 2-bromoaniline with ammonium peroxydisulfate in the presence of hydrochloric acid. The conductivity of the poly(2-bromoaniline) hydrochloride so produced was 10-6 S cm-1, its density at 20 °C 1.78 g cm-3 and weight-average molar mass 18 500 g mol-1. The degree of protonation was estimated as being a half of that of polyaniline. The structure of poly(2-bromoaniline) is discussed on the basis of FTIR spectra. Colloidal dispersions were produced when the polymerization had been carried out in the presence of a particulate or polymeric stabilizer, viz. colloidal silica, poly(vinyl alcohol), poly(N-vinylpyrrolidone) or (hydroxypropyl)cellulose. The UV-VIS spectra of colloidal dispersions are used to discuss the transition between the protonated and base forms.

Fine Structure of Platelet Interaction with a New Microcrystalline Collagen Preparation

1974 ◽  
Vol 32 ◽  
pp. 58-59
Author(s):  
W. H. Zucker ◽  
R. G. Mason
Keyword(s):  
Fine Structure ◽  
Platelet Aggregation ◽  
Hydrochloric Acid ◽  
Whole Blood ◽  
Platelet Adhesion ◽  
Hemostatic Agent ◽  
Native Collagen ◽  
Fibrillar Morphology ◽  
Clinical Interest ◽  
New Form

Platelet adhesion initiates platelet aggregation and is an important component of the hemostatic process. Since the development of a new form of collagen as a topical hemostatic agent is of both basic and clinical interest, an ultrastructural and hematologic study of the interaction of platelets with the microcrystalline collagen preparation was undertaken.In this study, whole blood anticoagulated with EDTA was used in order to inhibit aggregation and permit study of platelet adhesion to collagen as an isolated event. The microcrystalline collagen was prepared from bovine dermal corium; milling was with sharp blades. The preparation consists of partial hydrochloric acid amine collagen salts and retains much of the fibrillar morphology of native collagen.

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