Effects of chain packing and structural isomerism on the anisotropic linear and volumetric thermal expansion behaviors of polyimide films

Polymer ◽  
2018 ◽  
Vol 146 ◽  
pp. 386-395 ◽  
Author(s):  
Tomohiro Okada ◽  
Ryohei Ishige ◽  
Shinji Ando
Keyword(s):  
Thermal Expansion ◽  
Polyimide Films ◽  
Chain Packing ◽  
Volumetric Thermal Expansion ◽  
Structural Isomerism

Thermal expansion behavior of polyimide films containing benzoxazole unit

2014 ◽  
Vol 26 (4) ◽  
pp. 413-419 ◽  
Author(s):  
Guangliang Song ◽  
Daming Wang ◽  
Guodong Dang ◽  
Hongwei Zhou ◽  
Chunhai Chen ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Polyimide Films ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior

scholarly journals Extraordinary anisotropic thermal expansion in photosalient crystals

IUCrJ ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 83-89 ◽  
Author(s):  
Khushboo Yadava ◽  
Gianpiero Gallo ◽  
Sebastian Bette ◽  
Caroline Evania Mulijanto ◽  
Durga Prasad Karothu ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Solid State ◽  
Metal Complexes ◽  
Single Crystals ◽  
Room Temperature ◽  
Volumetric Thermal Expansion ◽  
Anisotropic Thermal Expansion ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients ◽  
Multifunctional Properties

Although a plethora of metal complexes have been characterized, those having multifunctional properties are very rare. This article reports three isotypical complexes, namely [Cu(benzoate)L 2], where L = 4-styrylpyridine (4spy) (1), 2′-fluoro-4-styrylpyridine (2F-4spy) (2) and 3′-fluoro-4-styrylpyridine (3F-4spy) (3), which show photosalient behavior (photoinduced crystal mobility) while they undergo [2+2] cycloaddition. These crystals also exhibit anisotropic thermal expansion when heated from room temperature to 200°C. The overall thermal expansion of the crystals is impressive, with the largest volumetric thermal expansion coefficients for 1, 2 and 3 of 241.8, 233.1 and 285.7 × 10−6 K−1, respectively, values that are comparable to only a handful of other reported materials known to undergo colossal thermal expansion. As a result of the expansion, their single crystals occasionally move by rolling. Altogether, these materials exhibit unusual and hitherto untapped solid-state properties.

Breaking the mutual restraint between low permittivity and low thermal expansion in polyimide films via a branched crosslink structure

Polymer ◽  
2019 ◽  
Vol 162 ◽  
pp. 116-120 ◽  
Author(s):  
Han Zhou ◽  
Huanyu Lei ◽  
Jianhua Wang ◽  
Shengli Qi ◽  
Guofeng Tian ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Polyimide Films ◽  
Low Thermal Expansion ◽  
Low Permittivity

Abnormal volumetric thermal expansion in the hourglass fermion materials KHgAs and KHgSb

2017 ◽  
Vol 95 (10) ◽  
Author(s):  
Dahu Chang ◽  
Chun-Yao Niu ◽  
Xiaowei Huang ◽  
Qiang Sun ◽  
Jun-Hyung Cho ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Volumetric Thermal Expansion

In-Plane Birefringence of Polyimide Films Prepared on Substrates Having Thermal Expansion Anisotropy

1995 ◽  
Vol 34 (Part 2, No. 11A) ◽  
pp. L1470-L1471 ◽  
Author(s):  
Shinji Ando ◽  
Takashi Sawada ◽  
Shigekuni Sasaki
Keyword(s):  
Thermal Expansion ◽  
Polyimide Films ◽  
Thermal Expansion Anisotropy
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