ISSN:
0887-624X
Keywords:
oxazolines
;
copolymers
;
poly(N-acylethylenimines)
;
pendant
;
hydroxyl
;
hydrogen bonding
;
crystalline
;
olefin
;
surface properties
;
9-BBN
;
FT-IR
;
DSC
;
WAXD
;
crystalline
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Poly(N-acylethylenimines) with hydroxyl groups randomly attached to the end of the side chains were synthesized from decenyl/heptyl oxazoline random copolymers. The terminal olefin groups in the polymer side chains react quantitatively with 9-borabicyclo[3.3.1]nonane (9-BBN) in THF solvent. The hydroborated polymers can be oxidized and transformed to the polymers with (SINGLE BOND)OH in their side chains. The polymer backbone is very stable in the hydroboration and oxidation reaction environment. The polymers were named as DH-OH or DM(m/n)-OH, where m and n represent the calculated numbers of monomers with and without the (SINGLE BOND)OH group, respectively. The DH(m/n)-OH copolymers were studied by DSC, wide-angle x-ray diffraction, contact angle measurement, and FT-IR. They are crystalline and show birefringence. In polymers with high concentration of hydroxyl groups, the (SINGLE BOND)OH groups promote polymer crystallization due to their strong interactions. They have very high ΔH of fusion, sharp crystallization peaks, and small supercoolings. Wide-angle x-ray diffraction study of these polymers demonstrated that their alkyl side chains are not fully extended in crystalline domain as those in the DH copolymers. Data from advancing water/ethanol mixture contact angle measurement indicates that most of the (SINGLE BOND)OH groups in the copolymers are buried and the polymer surface is mainly composed of methyl or methylene group. FT-IR study in the carbonyl stretching region proves that the (SINGLE BOND)OH groups can bend back and form hydrogen bonding with the carbonyl groups in the polymer backbone. Though the DH-OH polymers show basically a hydrocarbon surface in a normal environment, both receding water contact angle and peel strength measurements demonstrate that the polymer surfaces can reorganize when they are in contact with a polar liquid. The buried (SINGLE BOND)OH groups can be “pulled” out by polar agents such as water or tape adhesive. © 1996 John Wiley & Sons, Inc.
Additional Material:
12 Ill.
Type of Medium:
Electronic Resource
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