کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10609247 | 984560 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Poly(ethylene terephthalate) copolymers containing 1,4-cyclohexane dicarboxylate units
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Poly(ethylene terephthalate) copolymers containing 1,4-cyclohexane dicarboxylate units Poly(ethylene terephthalate) copolymers containing 1,4-cyclohexane dicarboxylate units](/preview/png/10609247.png)
چکیده انگلیسی
Poly(ethylene terephthalate-co-1,4-cyclohexane dicarboxylate) copolymers, abbreviated as PETCHD, containing from 2 up to 40Â mole% of the cycloaliphatic diacid, as well as the two parent homopolymers, PET and PECHD, were prepared from comonomer mixtures by a two-step melt-polycondensation procedure. Polymer intrinsic viscosities varied from 0.6 to 0.8Â dLÂ gâ1 with weight-average molecular weights spanning in the range from 30,000 to 70,000. The copolymers were found to have a random microstructure and a composition according to that used in their corresponding feeds. Thermal and mechanical properties of PETCHD were evaluated as a function of composition. Copolymers were found to be crystalline for all examined compositions although they crystallize from the melt only when the cycloaliphatic comonomer composition was below 20Â mole%. Both melting and glass transition temperatures of the copolyesters decreased rapidly with the content in CHD units, whereas the thermal stability appeared to be barely affected by copolymerization. Incorporation of 1,4-cyclohexane dicarboxylate units increased the Young's modulus and the maximum tensile strength of these materials but elongation to break drastically diminished. Preliminary X-ray diffraction studies revealed that PETCHD copolyesters seem to adopt the same crystal structure as PET.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 41, Issue 7, July 2005, Pages 1493-1501
Journal: European Polymer Journal - Volume 41, Issue 7, July 2005, Pages 1493-1501
نویسندگان
Natalia Sánchez-Arrieta, Antxon MartÃnez de Ilarduya, Abdelilah Alla, Sebastián Muñoz-Guerra,