Polyacrolein with microspherical structure obtained by radiation-initiation and base catalysis

Date

1990-3

Author

Usanmaz, Ali
Dogan, Recep Dursun

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

129
views

0
downloads

Acrolein was polymerized by radiation and base catalyzed condensation. Radiation polymerization was carried in bulk form under vacuum and air atmosphere at several temperatures. The conversion reached close to 100%, and polymers were free flowing white powders up to 5% conversion at −15°C, up to 80% at higher temperatures and up to 10% in air atmosphere polymerization. Radiation polymerization from aqueous solutions of various pH and from acetone solutions gave white powder polymers with limiting conversions ranging from 10 to 18% depending on the solution type or pH. The conversion at pH between 1, 5 to 8 gave minimum pH of 5 to 6. The base catalyzed polymerization at pH of 9 to 12 gave white powdered polymers changing to a yellowish colour with increase of pH. The limiting conversion was about 14%. The nature of repeating units in the polymer chains was studied by IR and thermogravimetry. The polymers contained different repeating units randomly, and the aldehyde content was higher for radiation polymerization than base catalyzed polymerization. A scanning electron microscope investigation showed the powder polymers to have microspherical structures of various size depending on polymerization conditions.

Subject Keywords

Materials chemistry, Polymers and plastics

URI

https://hdl.handle.net/11511/51695

Journal

Polymer Journal

DOI

https://doi.org/10.1295/polymj.22.233

Collections

Department of Chemistry, Article

Suggestions

OpenMETU
Core

POLYMERIZATION OF 4-VINYL-1-CYCLOHEXENE BY RADIATION AND CHEMICAL CATALYSTS CEVIK, NN; Usanmaz, Ali (Informa UK Limited, 1993-01-01) 4-Vinyl-1-cyclohexene was polymerized by radiation at room temperature under vacuum and in atmospheric air. The change of percent conversion with irradiation time is almost linear up to limiting conversion, but it is S-type in atmospheric air. It was shown that the mechanism of polymerization is most probably ionic rather than free-radical. The cationic polymerization was carried out in dichloromethane solution at -8-degrees-C using BF3(C2H5)2O as catalyst. The nature of the polymer obtained was investigate...
Flow induced polymer-filler interactions: Bound polymer properties and bound polymer-free polymer phase separation and subsequent phase inversion during mixing Akay, G. (Wiley, 1990-11) The irreversible absorption of macromolecules on to solid filler particles during mixing in the melt is investigated. The molecular weight and concentration dependence of the absorbed layer thickness are evaluated and the chemical and morphological nature of the irreversibly absorbed polymer (bound polymer) are determined. It is found that the thickness of the bound polymer is not only dependent on the filler concentration but also dependent on polymer molecular weight. Bound polymer in high density polyeth...
Polymerization of allyl alcohol by radiation to obtain microencapsulated structure Usanmaz, Ali; Sarıcılar Zengin, Süreyya (Springer Science and Business Media LLC, 1989-4) Allyl alcohol was polymerized by radiation under various conditions. The limiting conversions were about 30% in bulk, 35% when containing 0.03 mole fraction AlCl3 and 50% when water was contained at 27% (v/v). Irradiation was done with Co-60 gamma rays at room temperature and under vacuum. The presence of oxygen did not cause any change in the reaction rate. Molecular weights were determined by viscosity and cryoscopic methods. K and α values were found to be 3.57×10−4 and 0.62 for solutions in methanol at ...
Polymerization and dipole moment of poly(allyl cyanide) Küçükyavuz, Zühal; Usanmaz, Ali; Testereci, Şenay (Elsevier BV, 1990-9) Polymerization of allyl cyanide was carried out by radiation and chemical catalysis. Polymers obtained by γ-rays under various conditions such as in bulk and in the presence of either air or 0.1 mol% ZnCl2 were oily or solid dark-brown products with molecular weights up to 1.4 × 104. The polymers obtained by n-BuLi was a pale-yellow solid, insoluble in common organic solvents and water. No polymer was obtained with BF3O(C2H5)2. The mechanism of polymerization was shown by infra-red investigation to be diffe...
Polymerization and polymer characterization of n-vinylcaprolactam Polat, Özlem; Usanmaz, Ali; Department of Polymer Science and Technology (2005) In this study, N-vinylcaprolactam was polymerized by radiation in the solid state. The polymerization was carried out at room temperayure under vacuum and open to atmosphere respectively. The polymerization mechanism showed autoacceleration and the rate of polymerization was higher in the presence of oxygen. However the limiting conversion was 100% under vacuum conditions and 90% in the present of oxygen. This is due to the low molecular weight olgomer formation in the presence of oxygen. The polymers were ...

Citation Formats

A. Usanmaz and R. D. Dogan, “Polyacrolein with microspherical structure obtained by radiation-initiation and base catalysis,” Polymer Journal, pp. 233–241, 1990, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/51695.