کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9559229 | 1381146 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Esterification of ethylene-vinyl alcohol copolymers in homogeneous phase using N,Nâ²-dimethylpropyleneurea as solvent
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Esterification of ethylene-vinyl alcohol copolymers in homogeneous phase using N,Nâ²-dimethylpropyleneurea as solvent Esterification of ethylene-vinyl alcohol copolymers in homogeneous phase using N,Nâ²-dimethylpropyleneurea as solvent](/preview/png/9559229.png)
چکیده انگلیسی
Ethylene-vinyl alcohol copolymers (EVAL) were esterified with 3,5-dinitrobenzoyl chloride using the cycled urea N,Nâ²-dimethylpropyleneurea (1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone) (DMPU) as the solvent. Ethylene-vinyl alcohol-vinyl-3,5-dinitrobenzoate terpolymers (EVALVDNB) and ethylene-vinyl-3,5-dinitrobenzoate copolymers (EVDNB) were obtained. Both EVAL copolymers (6-73Â mol% VAL) and esterified polymers, EVDNB, and EVALVDNB dissolve in DMPU. The substitution may become total under the experimental conditions. The degree of transformation was determined by 1H NMR. EVDNB copolymers were characterised by IR spectroscopy and 1H and 13C NMR. Thermal properties were studied by DSC. The glass transition temperature of the EVDNB copolymers having a low VDNB content (up to 14Â mol%) is roughly constant, whereas above 50Â mol% increases. Melting temperature decreases as the VDNB content is increased, owing to the fact that the VDNB groups are excluded from the polyethylene crystal lattice.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 5, 14 February 2005, Pages 1473-1483
Journal: Polymer - Volume 46, Issue 5, 14 February 2005, Pages 1473-1483
نویسندگان
M.J. Fernández, M.D. Fernández,