POLYMETHYL ALPHA CYANOACRYLATES: I. MOLECULAR WEIGHT DETERMINATION BY LIGHT SCATTERING. II. EFFECT OF VARIOUS ANIONIC INITIATORS ON TERMINAL STRUCTURE.
Abstract
The weight average molecular weight found for polymethyl alpha cyanoacrylate was 17,600. But the number average molecular weight for the same material was ca 2000 by vapor pressure measurements. Therefore, the Mw/Mn is 8.8, indicating a wide molecular weight distribution. The infrared spectra for the polymers of methyl alpha cyanoacrylate polymerized with different nucleophiles differ only in the following regions: (1) OH absorption at 3300/cm, (2) OCH3 absorption at 1100/cm. The absorption peak at 1100/cm occurs only in the case of the methanol initiated polymerization product, indicating that OCH3 anion is the main initiating species in this case. The (OH) absorption, large in the case of water, is relatively small in the case of the other anions. This indicates that pyridine, B-alanine, cysteine, and glycine initiated polymers had very few polymer chains with (OH) as a terminal group. Consequently the terminal group for each polymer was most likely the corresponding anion of the pyridine, B-alanine, cysteine, and glycine.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1965
- Accession Number
- AD0625808
Entities
People
- Harold J. Porter
- R. K. Kulkarni