Evidence map›Paper›PMID 40647896›Full record

ArticlePolymers2025

Colorless Polyimides with Low Linear Coefficients of Thermal Expansion and Their Controlled Soft Adhesion/Easy Removability on Glass Substrates: Role of Modified One-Pot Polymerization Method.

Masatoshi Hasegawa, Takehiro Shinoda, Kanata Nakadai, Junichi Ishii, Tetsuo Okuyama, Kaya Tokuda, Hiroyuki Wakui, Naoki Watanabe, Kota Kitamura

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Polymers, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.

0numbers the graph read from it
0cells of the map it votes in
2citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

2 citing papers in PubMed.

  1. Article
  2. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Masatoshi HasegawaDepartment of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.ORCID 0000-0003-0144-0035
Takehiro ShinodaDepartment of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
Kanata NakadaiDepartment of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
Junichi IshiiDepartment of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
Tetsuo OkuyamaToyobo Co., Ltd., Corporate Research Center, 1-1, Katata 2-chome, Otsu-shi, Shiga 520-0292, Japan.
Kaya TokudaToyobo Co., Ltd., Corporate Research Center, 1-1, Katata 2-chome, Otsu-shi, Shiga 520-0292, Japan.
Hiroyuki WakuiToyobo Co., Ltd., Corporate Research Center, 1-1, Katata 2-chome, Otsu-shi, Shiga 520-0292, Japan.
Naoki WatanabeToyobo Co., Ltd., Corporate Research Center, 1-1, Katata 2-chome, Otsu-shi, Shiga 520-0292, Japan.
Kota KitamuraToyobo Co., Ltd., Corporate Research Center, 1-1, Katata 2-chome, Otsu-shi, Shiga 520-0292, Japan.

Funding

Toyobo Co., Ltd. N/A
6 · The paper itself

Abstract

This study presents colorless polyimides (PIs) suitable for use as plastic substrates in flexible displays, designed to be compatible with controlled soft adhesion and easy delamination (temporary adhesion) processes. For this purpose, we focused on a PI system derived from norbornane-2-spiro-α-cyclopentanone-α'-spiro-2″-norbornane-5,5″,6,6″-tetracarboxylic dianhydride (CpODA) and 2,2'-bis(trifluoromethyl)benzidine (TFMB). This system was selected with the aim of exhibiting excellent optical transparency and low linear coefficient of thermal expansion (CTE) properties. However, fabricating this PI film via the conventional two-step process was challenging because of crack formation. In contrast, modified one-pot polymerization at 200 °C using a combined catalyst resulted in a homogeneous solution of PI with an exceptionally high molecular weight, yielding a flexible cast film. The solubility of PI plays a crucial role in its success. This study delves into the mechanism behind the significant catalytic effect on enhancing molecular weight. The CpODA/TFMB PI cast film simultaneously achieved very high optical transparency, an extremely high glass transition temperature (

Indexed as

colorless polyimidescontrolled solid–solid adhesioneasy delaminationheat resistancelinear coefficients of thermal expansion (CTE)optical transparencytoughnesswater uptake

Identifiers

PMID40647896
PMCPMC12252339

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.