Polymerization and polymer characterization of n-vinylcaprolactam

Download

index.pdf

Date

2005

Author

Polat, Özlem

Metadata

Show full item record

Item Usage Stats

295
views

78
downloads

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 characterized by FT-IR, NMR, DSC, TGA, Light Scattering, GPC, Viscosity, X_Ray and mass spectrometry methods. FT-IR and NMR results showed that polymerization proceded through the vinyl groups and caprolactam is a pendent group. DSC results show that the polymer produced could be polymerized further or crosslink by heat treatment. The Tg value for the polymerobtained from radiation induced polymerization was about 147 C. It increased to 174 C after thermal treatment. Solution properties were studied by Light Scattering, GPC and viscosity measurements. The solutionbehavioor of the polymer was highyl dependent on the molecular weight of the polymer. This effect was also the conformation of polymer in solution and the viscosity properties. Since the polymer obtained had low molecular weight a regular relation could not be obtained for the radius of gyration, hydrodynamic radius and viscosity. X-ray diffraction studies showed that the monomer structure was retained up to about 86% conversion of monomer to polymer. The chain structure of the polymer was confirmed further by mass spectroscopic results.

Subject Keywords

Polymers.

URI

http://etd.lib.metu.edu.tr/upload/12606681/index.pdf
https://hdl.handle.net/11511/15405

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Nanocomposites based on blends of polyethylene Işık, Fatma; Yılmazer, Ülkü; Department of Chemical Engineering (2005) In this study the effects of compatibilizer type, organoclay type, and the addition order of components on the morphological, thermal, mechanical and flow properties of ternary nanocomposites based on low density polyethylene, LDPE were investigated. As compatibilizer, ethylene/methyl acrylate/glycidyl methacrylate, ethylene/glycidyl methacrylate, and ethylene/butyl acrylate/maleic anhydride; as organoclay Cloisite? 15A, Cloisite? 25A and Cloisite? 30B were used. All samples were prepared by a co-rotating t...
Thermal characterization of phenol and bisphenol-A based polybenzoxazines Bagherifam, Shahla; Hacaloğlu, Jale; Department of Polymer Science and Technology (2009) Although, several researches on synthesis and characterization of benzoxazines and polybenzoxazines have appeared in the literature, detailed studies on thermal characterization are still limited. In this study, polymerization and thermal degradation mechanisms of benzoxazines were investigated via direct pyrolysis mass spectrometry. Benzoxazine monomers prepared by reactions of phenol or bisphenol- A with aniline or methyl amine were analyzed to investigate the effects of the structures of phenyl and amine...
Polyacrolein with microspherical structure obtained by radiation-initiation and base catalysis Usanmaz, Ali; Dogan, Recep Dursun (Springer Science and Business Media LLC, 1990-3) 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 conversion...
Structural and thermal characterization of polymers via pyrolysis mass spectrometry Argın, Emir; Hacaloğlu, Jale; Department of Chemistry (2005) In the first part of this study, the structtural and thermal characterization of electrochemically and chemically polymerized poly(paraphenylene vinylene), (PPV), have been investigated by direct pyrolysis mass spectrometry. Thermal characteristics, and degradation products of electrochemically prepared poly(paraphenylene vinylene). Pyrolysis study indicated that thermal decomposition of PPV occurs at least two steps. The first being due to the loss of supporting electrolyte present and the second being dec...
Nanocomposites based on recycled poly(ethylene terepthalate) Tolga, Aslı; Yılmazer, Ülkü; Department of Chemical Engineering (2005) In this study, the effects of glycol type, organoclay type and concentration on the final properties of nanocomposites based on recycled poly(ethylene terephthalate) was investigated. For this purpose, first recycled PET was glycolysed and after that unsaturated polyester-montmorillonite nanocomposites were synthesized by using three different types of glycols (i.e. ethylene glycol (EG), propylene glycol (PG) and diethylene glycol (DEG)). As the first step, all the compositions were prepared by Cloisite 30B...

Citation Formats

Ö. Polat, “Polymerization and polymer characterization of n-vinylcaprolactam,” M.S. - Master of Science, Middle East Technical University, 2005.