کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5205314 | 1502929 | 2017 | 27 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and characterization of high-barrier polyimide containing rigid planar moieties and amide groups
ترجمه فارسی عنوان
سنتز و مشخصه پلی آمید با مانع بالا حاوی اجسام سخت و مسطح و گروه های آمید است
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کلمات کلیدی
پلی آمید کارکردی اجسام سخت و سخت، حجم آزاد، خواص باربری، خواص حرارتی،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
A high-performance polyimide was prepared by the dipolymerization of 4,4'-diaminobenzanilide (DABA) and pyromellitic dianhydride (PMDA). Due to the introduction of rigid planar moieties and amide groups, the polyimide shows outstanding properties, such as high glass transition temperatures (435 °C), excellent thermal stability (Td5%, 542 °C, coefficient of thermal expansion, â3.2 ppm Kâ1), and superior mechanical properties. Most importantly, the polyimide exhibits excellent barrier properties, with oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) low to 7.9 cm3 (m2 day)â1 and 5.1 g (m2 day)â1, respectively. Wide angle X-ray diffractograms (WAXD), positron annihilation lifetime spectroscopy (PALS) and molecular dynamics simulations reveal that the excellent barrier properties are mainly attributed to the high crystallinity, high extent of in-plane crystalline orientation, and low free volume, which are resulted from the rigid planar structure and strong interchain hydrogen bonding. The high-barrier and thermally stable polyimide has an attractive potential application prospect in the fields of micro-electronics encapsulation and high grade packaging industry.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 61, August 2017, Pages 83-92
Journal: Polymer Testing - Volume 61, August 2017, Pages 83-92
نویسندگان
Jun-Jie Liu, Jing-Hua Tan, Yi Zeng, Yi-Wu Liu, Ke-Jian Zeng, Yue-Jun Liu, Ruo-Mei Wu, Hong Chen,