反应详情

Using the procedure of Example 6, reaction of 10 g of poly(styrene [55 wt %], methyl acrylate [20 wt %], acrylic acid [25 wt %]) (Joncryl 67), 125 mL of 3,4-dihydro-2H-pyran, and 0.1 g of pyridine hydrochloride gave 10 g of poly(styrene, methyl acrylate, tetrahydropyranyl acrylate) after precipitation from dichloromethane in methanol at -70° C. 1H NMR (360 MHz, THF-d8): 5.9 (OCHO of tetrahydropyranyl ester). Mole ratio of styrene to tetrahydropyranyl ester=1.8:1. GPC: Mn=6260, Mw=15,900, Mw/Mn=2.54. DSC: Tg=52° C., decomposition endotherm peak at 180.77° C. (125.4 J/g). TGA: 20.69% weight loss at about 180° C. Titration of the product with 0.1N sodium hydroxide shows the presence of 0.2 meq/g of residual carboxylic acid groups. Titration of the starting material shows 3.4 meq/g of carboxylic acid.