ISSN:
0887-624X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Two adamantyl-containing oxazoline monomers. 2-(1-adamantyl)-2-oxazoline, A, and 2-(1-adamantylmethyl)-2-oxazoline, B, were synthesized, and polymerized in 1,2-dichlorobenzene to give polymers PA and PB respectively. Both polymers are highly crystalline and showed very high Tm's (269°C for PA and 320°C for PB) and little solubility in common organic solvents. Annealed PA showed a critical surface tension of 23.6 dyne/cm. PB was not soluble in the many organic solvents tested at room temperature. Due to its high Tm and insolubility, contact angle measurements on PB were impossible. Diblock copolymers based on different weight ratios of A and 2-ethyl-2-oxazoline, E, showed relatively narrow molecular weight distribution (MWD) when methyl p-nitrobenzenesulfonate, I, was used as initiator. After annealing, diblock polymers with B/I = 7, 10, or 12 showed Tm's (200-281°C); after quenching the same samples showed Tc's (160-171°C), which were lower than that of pure PB, 215°C. The quenched diblocks showed single Tg's (63-82°C) which implies that these short blocks are compatible. Diblock polymer with B/I = 5 and E/I = 20 was amorphous and displayed inverse emulsifying ability in styrene + water emulsion polymerization. BEB type triblock polymers prepared using ethylene glycol dinosylate as initiator had broader MWD and higher Tm's compared to their diblock counterparts with the same B/E wt% and B/I ratios. These triblock polymers were not completely soluble in styrene and/or water and therefore could not be used as emulsifying agents.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pola.1988.080260920
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