Progress of research on the bonding-strength improvement of two-layer adhesive-free flexible copper-clad laminates

Tang, Wanqi; Liu, Yuxi; Jing, Xianghai; Hou, Jinsong; Zhang, Qianfeng; Jian, Chongguang

doi:10.1039/d4ra01408a

RSC Adv.

2024

DOI: 10.1039/d4ra01408a

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Progress of research on the bonding-strength improvement of two-layer adhesive-free flexible copper-clad laminates

Wanqi Tang,

Yuxi Liu,

Xianghai Jing

et al.

Abstract: Bond strength of two-layer adhesive-free flexible copper-clad laminate is an important factor that directly affects the stability and reliability of electronic devices.

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Cited by 2 publications

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Synthesis of azabenzotriazole‐terminated liquid crystal poly(ester imide)s for improving their adhesion to copper foils

Li,

Guo,

Liu

et al. 2024

Polymers for Advanced Techs

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Liquid crystal polymers (LCPs) should be widely used as substrates in flexible copper clad laminate (FCCL) owing to their unique advantages. However, the poor adhesion of LCPs to copper foils hinders their applications. Considering the good adhesion between polyimides and copper foils, imide groups have previously been introduced into the main chains of LCP molecules. In the present paper, to further enhance the adhesion of the LCPEIs, the 1‐hydroxy‐7‐azabenzotriazole (HOAt) is used to terminate the main chains of LCPEI molecules, which arises from the excellent coordination interaction between the azabenzotriazole groups and copper ions. Thus, the liquid crystal poly(ester imide) (t‐LCPEI), carboxyl‐terminated liquid crystal poly(ester imide) (c‐LCPEI), and azabenzotriazole‐terminated liquid crystal poly(ester imide) (a‐LCPEI) were synthesized. The results showed that LCPEIs possessed liquid crystallinity, and the peel strength of a‐LCPEI film to copper foils was increased by about 140% and nearly 43%, respectively, compared to that of LCP and t‐LCPEI. Moreover, a‐LCPEI showed higher glass transition temperature (Tg = 211°C) than conventional LCP resins (Tg = 155°C, Vectra A), and excellent thermal properties. Meanwhile, the dielectric constant and loss of a‐LCPEI were as low as 3.04 and 9.7 × 10−3 at 10 GHz, respectively. These findings indicate that the azabenzotriazole‐terminated LCPEI is suitable to be used as the substrate material for high‐performance FCCL, and the work provides a feasible approach to enhance the adhesion and maintain the other outstanding properties of LCP.

show abstract

Synthesis of azabenzotriazole‐terminated liquid crystal poly(ester imide)s for improving their adhesion to copper foils

Li,

Guo,

Liu

et al. 2024

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

Battery-free flexible wireless temperature sensing for food storage

Wan,

Chen,

Song

et al. 2024

FlatChem

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Progress of research on the bonding-strength improvement of two-layer adhesive-free flexible copper-clad laminates

Abstract: Bond strength of two-layer adhesive-free flexible copper-clad laminate is an important factor that directly affects the stability and reliability of electronic devices.

Cited by 2 publications

References 142 publications

Synthesis of azabenzotriazole‐terminated liquid crystal poly(ester imide)s for improving their adhesion to copper foils

Synthesis of azabenzotriazole‐terminated liquid crystal poly(ester imide)s for improving their adhesion to copper foils

Battery-free flexible wireless temperature sensing for food storage

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