کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9837834 | 1525284 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
P-V-T properties of a polymer liquid crystal subjected to pre-drawing at several temperatures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We have studied the copolymer of poly(ethylene terephthalate) (PET) with 0.6 mole fraction of p-hydroxybenzoic acid (PHB). It is a longitudinal polymer liquid crystal (PLC). A number of otherwise identical samples were subjected to drawing to achieve in turn 20%, 40%, 60%, 80% and 100% increase in length. The drawing was performed isothermally at 60, 100 and 140 °C. Pressure-volume-temperature (P-V-T) results have been obtained for pressures up to 200 J cmâ3 and temperatures up to 150 °C or so. Parameters of the Hartmann equation of state have been evaluated. Drawing first results in an increase in specific (and also free) volume, then in a decrease caused by increased orientation of the PLC, and finally in an apparent increase caused by the appearance of voids. The tensile modulus E has been determined for all pre-drawn samples. It reflects the volumetric changes a rebours: the initial increase in specific volume results in lower E values, orientation in E increase, and void formation in a second decrease.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 357, Issues 3â4, 15 March 2005, Pages 500-506
Journal: Physica B: Condensed Matter - Volume 357, Issues 3â4, 15 March 2005, Pages 500-506
نویسندگان
Georg Broza, Victor M. Castaño, Gonzalo Martinez-Barrera, Kevin P. Menard, Carla Simões,