Controlled Thermal Imidization of Thermoplastic Polyimide for Temporary Bonding and Debonding in Advanced Packages

Huang, Da; Liu, Jinshan; Li, Jinhui; Wang, Fangcheng; Li, Kang; Liu, Qiang; Yin, Huimin; Zhang, Guoping; Sun, Rong

doi:10.1021/acsapm.2c01415

Cited by 14 publications

(3 citation statements)

References 50 publications

(65 reference statements)

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“…In Figure 3B, there is a broad absorption peak at 2θ of 10 -30 in pure PI, which represents the amorphous structure of the PI matrix. 43 In addition, only the diffraction peaks of BaTiO 3 are found in all of the composite films, corresponding to the fact that the outermost PDA layer overlays the inner MgO layer.…”

Section: Resultsmentioning

confidence: 98%

Construction of sandwich‐layered polyimide hybrid films containing double core–shell structured fillers for high energy storage density

Cao,

Zhang,

Zhao

et al. 2023

Polymer Composites

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The inherent low dielectric constant of polyimide (PI) dielectrics restricts their applications to become a component of high energy density film capacitors. In this work, double core–shell structured barium titanate@magnesium oxide@polydopamine (BaTiO3@MgO@PDA) nanoparticles were synthesized successfully and utilized as high dielectric constant functional fillers for PIs, in which the insulating MgO layer meliorated dielectric constant difference between BaTiO3 and PI matrix, and the organic PDA layer improved the compatibility between the inorganic fillers and PI matrices. Then, a series of sandwich‐structured PI‐based hybrid films was prepared through a layer‐by‐layer solution casting method. The middle layer of pure PI with excellent insulating properties effectively suppressed charge injection. With the combination of sandwich structure and the BaTiO3@MgO@PDA nanoparticles, the PI hybrid film containing 15 wt% fillers in the outer layers achieved the maximum breakdown strength of 425.68 kV/mm and the maximum energy density of 5.132 J/cm3, which was 68.3% and 413% higher than those of pure PI film, respectively, meanwhile maintained a low dielectric loss value of 0.0083 at 1 kHz. The introduction of BaTiO3@MgO@PDA enhanced the interfacial polarization due to the high barrier energy between adjacent layers preventing the transfer of electrons and weakening the leakage current in the sandwich‐structured composite film. This work demonstrates that an appropriate combination of high dielectric hybrid fillers and multilayer structure can effectively increase the energy storage density of PI substrate for high‐temperature energy storage applications.Highlights The double core–shell structured BaTiO3@MgO@PDA was synthesized successfully. The sandwich‐structured hybrid films were prepared by layer‐by‐layer method. The energy density of hybrid films reached a high value of 5.132 J/cm3.

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Section: Resultsmentioning

confidence: 98%

Construction of sandwich‐layered polyimide hybrid films containing double core–shell structured fillers for high energy storage density

Cao,

Zhang,

Zhao

et al. 2023

Polymer Composites

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show abstract

“…105,106 When asymmetric biphenyl-tetracarboxylic acid dianhydride was introduced into the molecular structure of TPI, the packing density and interaction force between molecular chains decreased. 107,108 TPI with increased molecular chain mobility can diffuse thoroughly on the PI lm, and the adhesion between the two is good. TPI can effectively inltrate the copper surface and wrap small copper nodules; carbon compounds can be found on the surface of stripped copper foil.…”

Section: Surface Treatment and Modication Of Pi Lmsmentioning

confidence: 99%

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

Tang,

Liu,

Jing

et al. 2024

RSC Adv.

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“…Adhesives play an important role and are widely used in industries, such as aerospace, automobile manufacturing, civil engineering, and daily life . In recent years, recycling valuable adherends from waste products by debonding has attracted significant attention from not only the academia but also business circles for its fresh perspective of green chemistry and sustainability. − For traditional adhesives, they are chemically stable and usually have a strong interaction (covalent bonds, physical interactions, or their combinations) with the substrate surfaces. Therefore, debonding of the adhesive joints can only be conducted by thermal degradation, cutting, etc., which may inevitably lead to damage or even destroy the substrates.…”

Section: Introductionmentioning

confidence: 99%

Green, Removable Adhesive Based on Graft Copolymers of Aliphatic Polyesters for Multiple Types of Substrates

Hou

Zhang

et al. 2023

ACS Sustainable Chem. Eng.

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Adhesive is a widely used material. However, most of traditional synthetic adhesives are difficult to be peeled and removed without damaging the adherends due to their excellent chemical stability and strong interaction (covalent bonds, physical interactions, or their combinations) with the substrate surfaces. Therefore, complete and efficient recovery of the substrates has become a huge challenge. In this work, a green, removable adhesive based on graft copolymers of aliphatic polyesters, i.e., PPDO (poly(1,4-dioxan-2-one)) and PCL (poly(epsilon-caprolactone)) was prepared through one-pot ring-opening polymerization using polyvinyl alcohol (PVA) as the macro-initiator. The graft copolymers have abundant graft chains and hydroxyl end groups owing to their comb-like molecular topology, which therefore act as active sites for bonding with the substrate surfaces. The graft copolymers showed considerable adhesive strength to various substrates, including stainless steel plates (lap shear strength >1 MPa), woods (>1 MPa), glasses with a very low surface roughness (<10 nm) (0.62 ± 0.04 MPa), and plastics with low surface energy such as PE (T-peel strength: 427.0 g f /25 mm). Furthermore, the adhesives based on aliphatic polyesters could be easily debonded under a relatively mild condition through degradation when they were taken out of service, thus realizing the intact recovery of the substrates. The debonded adhesive and its degradation products could be further depolymerized to monomers with a very high purity (>99.5%) by acidification−dehydrative cyclization or simple pyrolysis (150 °C) under vacuum. In the whole life cycle, almost no versatile organic compounds were used. In addition, CCK8 experiments proved that the graft copolymer adhesive had no toxicity to HEK 293T human cells, indicating that it is a green adhesive with great potential.

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Controlled Thermal Imidization of Thermoplastic Polyimide for Temporary Bonding and Debonding in Advanced Packages

Cited by 14 publications

References 50 publications

Construction of sandwich‐layered polyimide hybrid films containing double core–shell structured fillers for high energy storage density

Construction of sandwich‐layered polyimide hybrid films containing double core–shell structured fillers for high energy storage density

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

Green, Removable Adhesive Based on Graft Copolymers of Aliphatic Polyesters for Multiple Types of Substrates

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