Polysiloxane Ionic Gel-based Soft Elastic Thermally Conductive Interfacial Materials

Xi-bo Zhao; Hui-tao Yu; Meng-meng Qin; Wei Feng

doi:10.11777/j.issn1000-3304.2025.25087

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Polysiloxane Ionic Gel-based Soft Elastic Thermally Conductive Interfacial Materials

更新时间：2025-06-19

- Polysiloxane Ionic Gel-based Soft Elastic Thermally Conductive Interfacial Materials
- Acta Polymerica Sinica Pages: 1-13(2025)
- 作者机构：
  
  天津大学材料科学与工程学院天津 300072
- 作者简介：
  
  Meng-meng Qin, E-mail: qmm@tju.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25087
  CLC：
- CSTR：32057.14.GFZXB.2025.7422
- Received：02 April 2025，
  
  Accepted：23 May 2025，
  
  Published Online：19 June 2025，
- 稿件说明：
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赵熙博, 俞慧涛, 秦盟盟, 封伟. 聚硅氧烷离子凝胶基软弹性界面导热材料. 高分子学报, doi: 10.11777/j.issn1000-3304.2025.25087

Zhao, X. B.; Yu, H. T.; Qin, M. M.; Feng, W. Polysiloxane ionic gel-based soft elastic thermally conductive interfacial materials. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2025.25087
赵熙博, 俞慧涛, 秦盟盟, 封伟. 聚硅氧烷离子凝胶基软弹性界面导热材料. 高分子学报, doi: 10.11777/j.issn1000-3304.2025.25087 DOI： CSTR： 32057.14.GFZXB.2025.7422.

Zhao, X. B.; Yu, H. T.; Qin, M. M.; Feng, W. Polysiloxane ionic gel-based soft elastic thermally conductive interfacial materials. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2025.25087 DOI： CSTR： 32057.14.GFZXB.2025.7422.

摘要

新型热界面材料(TIMs)需要兼具软弹性与高导热性，以实现复杂界面的高效连接与热传导. 极端高低温使用工况又对TIMs提出了新的性能要求. 能否在低温下使TIMs保持良好的软弹性和结构稳定性，是决定其热疏导性能的关键因素. 在聚硅氧烷主链接枝侧链形成刷型聚合物来调控其柔性与低温结晶现象. 部分接枝末端羟基咪唑离子液体，制备出富含氢键且耐低温的聚硅氧烷离子液体(PIL)，并进一步接枝丙烯酸己酯，制备出聚硅氧烷离子凝胶(PIL-GEL). PIL-GEL材料在-80 ℃、50%压缩率的条件下，压缩强度为2.75 kPa，在-40 ℃下30 min的拉伸自修复效率达到42.2%. 利用双辊固化集成装置，成功实现了六方氮化硼(h-BN)/聚合物薄膜的连续制备. 利用堆叠、压缩和垂直切割技术，制备出基于垂直取向的PIL-GEL@h-BN的TIMs，其在填料质量分数为30%的条件下，具有高面外热导率(5.851 W·m

-1

·K

-1

)、低压缩模量(9.8 kPa)和接触热阻(63.26 K·mm

·W

-1

). 在50%的动态压缩条件下，界面温度变化仅为0.64 ℃，展现出出色的界面热管理能力.

Abstract

Novel thermal interface materials (TIMs) have to possess soft elasticity and high thermal conductivity to realize efficient interfacial connections and thermal evacuation. Extremely high and low temperature conditions also put new demands on TIMs. How to maintain the excellent soft elasticity and structural stability of TIMs at low temperature is the key to determining their thermal c

onductivity properties. The formation of brush polymers within the side chains of polysiloxane main link branches has been demonstrated to modulate flexibility and low-temperature crystallization phenomena. Hydrogen-bonded and low-temperature resistant polysiloxane ionic liquids (PIL) were prepared by grafting terminal hydroxyimidazoles ionic liquids partly. Polysiloxane ionic gels (PIL-GEL) were prepared by further grafting of hexyl acrylate. The PIL-GEL has a low elastic modulus

and the compressive strength of 50% compression ratio is 2.75 kPa at -80 ℃

and the self-healing efficiency at -40 ℃ for 30 min reaches 42.2%. Continuous preparation of hexagonal boron nitride (h-BN)/polymer thin films was successfully achieved using a dual-roll curing integrated device. And using stacking

cold pressing

and vertical cutting techniques

PIL-GEL@h-BN TIMs with excellent properties were prepared with high through-plane thermal conductivity (5.851 W·m

-1

·K

-1

) at low filler content (30 wt%)

low compression modulus (9.8 kPa)

and contact thermal resistance (63.26 K·mm

·W

-1

). Under 50% dynamic compression

the interfacial temperature change is only 0.64 ℃

providing excellent interfacial thermal management.

关键词

Keywords

references

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