Lightweight Ethylene-Vinyl Acetate Copolymer/Low-density Polyethylene/Carbon Nanotube Foams <italic style="font-style: italic">via</italic> Supercritical Carbon Dioxide Foaming for Piezoresistive Sensors

Hao-Hao Hou; Xin He; Hui Ma; Hong-Fu Zhou; Bian-Ying Wen; Xiang-Dong Wang; Ya-Feng Deng

doi:10.1007/s10118-025-3343-5

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Lightweight Ethylene-Vinyl Acetate Copolymer/Low-density Polyethylene/Carbon Nanotube Foams via Supercritical Carbon Dioxide Foaming for Piezoresistive Sensors

RESEARCH ARTICLE | Updated：2025-07-15

- Lightweight Ethylene-Vinyl Acetate Copolymer/Low-density Polyethylene/Carbon Nanotube Foams via Supercritical Carbon Dioxide Foaming for Piezoresistive Sensors
- Lightweight Ethylene-Vinyl Acetate Copolymer/Low-density Polyethylene/Carbon Nanotube Foams via Supercritical Carbon Dioxide Foaming for Piezoresistive Sensors
- 高分子科学（英文） 2025年43卷第7期页码：1208-1221
- Affiliations：
  
  a.Key Laboratory of Processing and Application of Polymeric Foams of China National Light Industry Council, School of Light Industry Science and Engineering, Beijing Technology and Business University, Beijing 100048, China
  b.School of Computer and Artificial Intelligence, Beijing Technology and Business University, Beijing 100048, China
- Author bio：
  
  zhouhongfu@th.btbu.edu.cn (H.F.Z.)
  dengyafeng@th.btbu.edu.cn (Y.F. D.)
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (No. 52473026).
- DOI：10.1007/s10118-025-3343-5
  中图分类号： M
- 收稿：2025-02-14，
  
  修回：2025-03-18，
  
  录用：2025-03-20，
  
  网络首发：2025-04-29，
  
  纸质出版：2025-07-01
- Accepted：
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Hou, H. H.; He, X.; Ma, H.; Zhou, H. F.; Wen, B. Y.; Wang, X. D.; Deng, Y. F. Lightweight ethylene-vinyl acetate copolymer/low-density polyethylene/carbon nanotube foams via supercritical carbon dioxide foaming for piezoresistive sensors. Chinese J. Polym. Sci. 2025, 43, 1208–1221

Hao-Hao Hou, Xin He, Hui Ma, et al. Lightweight Ethylene-Vinyl Acetate Copolymer/Low-density Polyethylene/Carbon Nanotube Foams via Supercritical Carbon Dioxide Foaming for Piezoresistive Sensors[J]. Chinese Journal of Polymer Science, 2025, 43(7): 1208-1221. DOI: 10.1007/s10118-025-3343-5.
Hou, H. H.; He, X.; Ma, H.; Zhou, H. F.; Wen, B. Y.; Wang, X. D.; Deng, Y. F. Lightweight ethylene-vinyl acetate copolymer/low-density polyethylene/carbon nanotube foams via supercritical carbon dioxide foaming for piezoresistive sensors. Chinese J. Polym. Sci. 2025, 43, 1208–1221 DOI： 10.1007/s10118-025-3343-5.

Hao-Hao Hou, Xin He, Hui Ma, et al. Lightweight Ethylene-Vinyl Acetate Copolymer/Low-density Polyethylene/Carbon Nanotube Foams via Supercritical Carbon Dioxide Foaming for Piezoresistive Sensors[J]. Chinese Journal of Polymer Science, 2025, 43(7): 1208-1221. DOI: 10.1007/s10118-025-3343-5. DOI：

摘要

In EVA/LDPE composites

the crosslinking agent BIBP and conductive filler CNT were introduced to construct a composite structure combining chemical crosslinking and physical entanglement. Coupled with supercritical CO

foaming technology

the piezoresistive sensing performance of the foam was significantly enhanced.

Abstract

Flexible polymer-based foam sensors have significant potential for application in wearable electronics and motion monitoring. However

these prospects are hindered by the complex and unenvironmentally friendly manufacturing processes. In this study

we employed melt blending and supercritical carbon dioxide foaming to fabricate an ethylene-vinyl acetate copolymer (EVA)/low-density polyethylene (LDPE)/carbon nanotube (CNT) piezoresistive foam sensor. The cross-linking agent bis(tert-butyldioxyisopropyl) benzene and the conductive filler CNT were incorporated into the EVA/LDPE composite

successfully achieving a chemically cross-linked and physically entangled composite structure that significantly enhanced the storage modulus and complex viscosity. Additionally

the compressive strength of EVA/LDPE/CNT foam with 10 parts per hundred rubber (phr) CNT reached 1.37 MPa at 50% compression

marking a 340% increase compared to the 0.31 MPa of the CNT-free sample. Furthermore

the EVA/LDPE/CNT composite foams

which incorporated 10 phr CNT

were prepared under specific foaming conditions

resulting in an ultra-low density of 0.11 g/cm

and a higher sensitivity

with a gauge factor of –2.3. The piezoresistive foam sensors developed in this work could accurately detect human motion

thereby expanding their applications in the field of piezoresistive foam sensors and providing an effective strategy for the advancement of high-performance piezoresistive foam sensors.

关键词

Keywords

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Lightweight Ethylene-Vinyl Acetate Copolymer/Low-density Polyethylene/Carbon Nanotube Foams via Supercritical Carbon Dioxide Foaming for Piezoresistive Sensors

Lightweight Ethylene-Vinyl Acetate Copolymer/Low-density Polyethylene/Carbon Nanotube Foams via Supercritical Carbon Dioxide Foaming for Piezoresistive Sensors

DOI：10.1007/s10118-025-3343-5

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