کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5210018 | 1382870 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis of liquid-crystalline benzoxazines containing a biphenyl group in the mesogenic moiety
ترجمه فارسی عنوان
سنتز بنزوکسازین مایع بلورین حاوی یک گروه بیفنیلی در بخش مازوژن است
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کلمات کلیدی
پلیبن زاکسازین، رزین فنلی، مایع بلورین،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
In this work, we describe a process to synthesize novel liquid-crystalline (LC) benzoxazines from a LC phenol that contains biphenyl, ester and azomethine groups in the mesogenic moiety, various alkyl amines and formaldehyde. The LC behavior of the biphenyl-containing benzoxazines was investigated by differential scanning calorimetry and polarized optical microscopy and compared with analogous phenyl-containing LC benzoxazines containing phenyl, ester and azomethine groups in the mesogenic moiety. While the LC benzoxazines containing the phenyl groups only exhibited a nematic phase upon heating, the LC benzoxazines containing biphenyl groups exhibited a smectic phase as well as a nematic phase. Additionally, the LC-isotropic transition temperatures were over 100 °C higher than that for the phenyl-containing LC benzoxazines. A film obtained by curing the biphenyl-containing LC benzoxazine at 180 °C for 1 h exhibited birefringence. Finally, the thermal diffusivity of the cured LC benzoxazines was also investigated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Reactive and Functional Polymers - Volume 73, Issue 9, September 2013, Pages 1223-1230
Journal: Reactive and Functional Polymers - Volume 73, Issue 9, September 2013, Pages 1223-1230
نویسندگان
Masayoshi Ito, Takehiro Kawauchi, Koichi Sakajiri, Tsutomu Takeichi,