کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5204099 | 1381949 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chemical modification of poly(vinyl chloride) by nucleophilic substitution
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The reaction of poly(vinyl chloride) (PVC) in nucleophile (Nu)/ethylene glycol (EG) or Nu/N,N-dimethylformamide (DMF) solution was found to result in the substitution of Cl in PVC with Nu from solution, in addition to the straight elimination of HCl, both of which led to the dechlorination of PVC. Examined Nuâ were Iâ, SCNâ, OHâ, N3â, and the phthalimide anion. For the Nu/EG solution, elimination was favoured over substitution for all Nuâ. The ratio of substitution to dechlorination was notable, descending in the order OHâ > SCNâ = N3â > phthalimide anion > Iâ. For the Nu/DMF solution, the ratio of substitution to dechlorination was high, in the order SCNâ > N3â > Iâ > phthalimide anion. In both cases, the orders of the ratios were similar to those of the nucleophilic reactivity constant, Iâ > SCNâ > N3â > phthalimide anion, except for Iâ. The low ratio for Iâ was attributable to the elimination of HI after the substitution of Cl in PVC with I in solution, because Iâ is a strong nucleophile, as well as an excellent leaving group. Comparing the effect of EG and DMF on the substitution of Cl in PVC with Nu in solution, the ratio of substitution to dechlorination was higher for Iâ, SCNâ, N3â, and the phthalimide anion in DMF than in EG. The substitution of Cl in PVC with Nu in solution was found to occur preferentially in DMF versus EG.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 94, Issue 1, January 2009, Pages 107-112
Journal: Polymer Degradation and Stability - Volume 94, Issue 1, January 2009, Pages 107-112
نویسندگان
Tomohito Kameda, Masahiko Ono, Guido Grause, Tadaaki Mizoguchi, Toshiaki Yoshioka,