Fluorinated Colorless Polyimides with High Heat-resistance and Low Birefringence

Zou, Bing-Yu; Qiu, Lu-Hao; Lei, Huan-Yu; Liu, Jin-Ming; Peng, Wei-Feng; Zhao, Hong-Qin; Bao, Feng; Huang, Ming-Jun

doi:10.1007/s10118-023-3011-6

Cited by 5 publications

(1 citation statement)

References 48 publications

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“…10 As represented in Table 3, PI2 with CF 3 side groups had higher lightness values (L*), lower redness values(a*), yellowness values (b*), and yellowness index values (YI) than PI1 with CH 3 side groups, due to the large steric hindrance and electronegativity of CF 3 substituent. 41,42 3.5 | Thermal properties 4 show the glass-transition temperature (T g ) of PI films, which was determined by the peak temperature of the tan θ curve with DMA. The T g of PI1 and PI2 were 386 and 351 C, respectively, indicating good heat-resistance properties suitable for the soldering process (T g > 300 C).…”

Section: Optical Propertiesmentioning

confidence: 99%

Synthesis of colorless polyimides derived from benzimidazole diamines with bis‐amide structures

Zhang,

Guo,

et al. 2024

Journal of Polymer Science

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To make the colorless polyimides (CPIs) suitable for the application of flexible display technology, the polyimide (PI) films need to have both good optical properties and thermal properties. To get the wanted properties, 2‐(2‐methyl‐4‐(2‐methyl‐4‐aminobenzamido)phenyl)‐5‐(2‐methyl‐4‐aminobenzamido)‐N‐phenylbenzimidazol (5a) and 2‐(2‐methyl‐4‐(2‐trifluoromethyl‐4‐aminobenzamido)phenyl)‐5‐(2‐trifluoromethyl‐4‐aminobenzamido)‐N‐phenylbenzimidazol (5b) were synthesized, which both contained benzimidazole and bis‐amide structures. Two kinds of PI films were polymerized with cyclobutane‐1,2,3,4‐tetracarboxylic dianhydride (CBDA). With the contribution of side groups (CH3 or CF3), the resulting PI films presented relatively superior optical properties (transmittance at 400 nm was 59% and 68% respectively) and low coefficient of thermal expansion (CTE = 22 and 25 ppm K−1). These good properties suggest that these PI films have the potential for flexible display usage.

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Section: Optical Propertiesmentioning

confidence: 99%

Synthesis of colorless polyimides derived from benzimidazole diamines with bis‐amide structures

Zhang,

Guo,

et al. 2024

Journal of Polymer Science

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Transparent and highly organosoluble aromatic polyimides with twisted backbone and bulky side substituents for flexible substrate materials

She,

Wang,

Liao

et al. 2023

Journal of Polymer Science

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In this study, four novel aromatic polyimides (PIs) with twisted backbone and bulky side substituents were prepared via chemical imidization reaction and two‐step condensation polymerization at reduced reaction temperature. The number‐average and weight‐average molecular weights of the resulting PIs are in the range of 1.98 × 104–4.10 × 104 and 2.66 × 104–5.32 × 104 g mol−1, respectively, while maintaining polydispersity indices consistently below 2.0. In addition, the obtained PIs showed excellent solubility in most common solvents, even in low‐boiling solvents, such as chloroform, dichloromethane, and tetrahydrofuran. The films casted from these PIs also displayed optical transparency with a cutoff wavelength in the range of 335–360 nm. Among the PIs, PAPOT‐OPDA, derived from 3,3′‐Diisopropyl‐4,4′‐diaminodiphenyl‐3″‐phenoxybenzylmethane (PAPOT) and 3,3′,4,4′‐diphenylethertetracarboxylic dianhydride (OPDA), exhibited the highest transparency of T450 = 81% and T500 = 85%, and the best solubility without compromising its thermal properties.

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Synthesis of colorless transparent poly(amide-imide) with high modulus and low thermal expansion coefficient and its performance study

Chen,

Xing,

Lao

et al. 2024

Polymer

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Fluorinated Colorless Polyimides with High Heat-resistance and Low Birefringence

Cited by 5 publications

References 48 publications

Synthesis of colorless polyimides derived from benzimidazole diamines with bis‐amide structures

Synthesis of colorless polyimides derived from benzimidazole diamines with bis‐amide structures

Transparent and highly organosoluble aromatic polyimides with twisted backbone and bulky side substituents for flexible substrate materials

Synthesis of colorless transparent poly(amide-imide) with high modulus and low thermal expansion coefficient and its performance study

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