Site–site interactions in a polymer matrix: The effect of polymer backbone structure on the transformation of crosslinked resins with substituted hydrazines
✍ Scribed by Marko Zupan; Peter Krajnc; Stojan Stavber
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 546 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
Crosslinked chloromethylated polystyrene (1) and crosslinked copoly(styrene-p-nitrophenylacrylate) (3) readily reacted with 1,l-dimethylhydrazine, but the course of the reaction is strongly dependent on the structure of the backbone. Monofunctionalization was observed with chloromethylated polystyrene (1) giving the l,l,l-dimethylhydrazinium chloride derivative (2), while high degree of additional crosslinking took place with crosslinked copoly(styrene-p-nitrophenylacrylate) (3), and additional crosslinking was also observed in functionalization with N-aminopiperidine and N-aminomorpholine. The additional crosslinking suggested a higher backbone mobility in acrylate beads (3) compared to chloromethylated polystyrene (1). The type of transformation and the degree of additional crosslinking also depended on the starting crosslinking of copoly(styrene-p-nitrophenylacrylate) (3; 3a. 2% DVB; 3b, 4% DVB; 3c, 10% DVB). Replacement of p-nitrophenol groups in copoly(styrene-p-nitrophenylacrylate) (3) with hydrazino units resulted in enhanced swelling abilities of the hydrazine derivatives (4, 5, 6) in methanol, dimethylformamide, and chloroform, while formation of the hydrazinium chloride derivative (2) from chloromethylated polystyrene ( 1) caused enhancement of swelling in methanol but diminished it in toluene. The degree of crosslinking of copoly(styrene-p-nitrophenylacrylate) (3) also influenced the swelling abilities of 3 and its hydrazino derivatives, being higher with 2% crosslinked resins and lower with 4% and 10% crosslinked resins. 0 1996 John Wiley & Sons, Inc.