Highly ordered and uniformly porous structure of conductive foams is a vital issue for various functional purposes such as piezoresistive sensing and electromagnetic interference(EMI) shielding. With the aids of Kevla...Highly ordered and uniformly porous structure of conductive foams is a vital issue for various functional purposes such as piezoresistive sensing and electromagnetic interference(EMI) shielding. With the aids of Kevlar polyanionic chains, thermoplastic polyurethane(TPU) foams reinforced by aramid nanofibers(ANF) with adjustable pore-size distribution were successfully obtained via a nonsolvent-induced phase separation. In this regard, the most outstanding result is the in situ formation of ANF in TPU foams after protonation of Kevlar polyanion during the NIPS process. Furthermore, in situ growth of copper nanoparticles(Cu NPs) on TPU/ANF foams was performed according to the electroless deposition by using the tiny amount of pre-blended Ti_(3)C_(2)T_(x) MXene as reducing agents. Particularly, the existence of Cu NPs layers significantly promoted the storage modulus in 2,932% increments, and the well-designed TPU/ANF/Ti_(3)C_(2)T_(x) MXene(PAM-Cu) composite foams showed distinguished compressive cycle stability. Taking virtues of the highly ordered and elastic porous architectures, the PAM-Cu foams were utilized as piezoresistive sensor exhibiting board compressive interval of 0–344.5 kPa(50% strain) with good sensitivity at 0.46 kPa^(-1). Meanwhile,the PAM-Cu foams displayed remarkable EMI shielding effectiveness at 79.09 dB in X band. This work provides an ideal strategy to fabricate highly ordered TPU foams with outstanding elastic recovery and excellent EMI shielding performance, which can be used as a promising candidate in integration of satisfactory piezoresistive sensor and EMI shielding applications for human–machine interfaces.展开更多
采用阴离子接枝法对K ev lar纤维(KF)进行改性。利用偏光显微镜研究了未改性K ev lar纤维(KF 0)和改性K ev lar纤维(KF 1)增强尼龙6复合材料的结晶情况,界面横晶的形成机理及影响因素。结果表明,在尼龙6/KF复合体系中,KF 0和KF 1的加入...采用阴离子接枝法对K ev lar纤维(KF)进行改性。利用偏光显微镜研究了未改性K ev lar纤维(KF 0)和改性K ev lar纤维(KF 1)增强尼龙6复合材料的结晶情况,界面横晶的形成机理及影响因素。结果表明,在尼龙6/KF复合体系中,KF 0和KF 1的加入都能诱发其表面的基体PA 6形成横晶,在低温下纤维的诱发横晶能力小,形成的横晶不致密、不完整;在高结晶温度Tc下形成的横晶完整而致密,纤维的诱发横晶能力大;KF 1与基体有较强的结合力,故其诱发横晶能力较KF 0强。展开更多
基金financially sponsored by the Science and Technology Commission of Shanghai Municipality (20230742300 and 18595800700)Key Laboratory of Resource Chemistry, Ministry of Education (KLRC_ME2103)the project of “joint assignment” in Shanghai University led by Prof. Tongyue Gao from School of Mechatronic Engineering and Automation。
文摘Highly ordered and uniformly porous structure of conductive foams is a vital issue for various functional purposes such as piezoresistive sensing and electromagnetic interference(EMI) shielding. With the aids of Kevlar polyanionic chains, thermoplastic polyurethane(TPU) foams reinforced by aramid nanofibers(ANF) with adjustable pore-size distribution were successfully obtained via a nonsolvent-induced phase separation. In this regard, the most outstanding result is the in situ formation of ANF in TPU foams after protonation of Kevlar polyanion during the NIPS process. Furthermore, in situ growth of copper nanoparticles(Cu NPs) on TPU/ANF foams was performed according to the electroless deposition by using the tiny amount of pre-blended Ti_(3)C_(2)T_(x) MXene as reducing agents. Particularly, the existence of Cu NPs layers significantly promoted the storage modulus in 2,932% increments, and the well-designed TPU/ANF/Ti_(3)C_(2)T_(x) MXene(PAM-Cu) composite foams showed distinguished compressive cycle stability. Taking virtues of the highly ordered and elastic porous architectures, the PAM-Cu foams were utilized as piezoresistive sensor exhibiting board compressive interval of 0–344.5 kPa(50% strain) with good sensitivity at 0.46 kPa^(-1). Meanwhile,the PAM-Cu foams displayed remarkable EMI shielding effectiveness at 79.09 dB in X band. This work provides an ideal strategy to fabricate highly ordered TPU foams with outstanding elastic recovery and excellent EMI shielding performance, which can be used as a promising candidate in integration of satisfactory piezoresistive sensor and EMI shielding applications for human–machine interfaces.
文摘采用阴离子接枝法对K ev lar纤维(KF)进行改性。利用偏光显微镜研究了未改性K ev lar纤维(KF 0)和改性K ev lar纤维(KF 1)增强尼龙6复合材料的结晶情况,界面横晶的形成机理及影响因素。结果表明,在尼龙6/KF复合体系中,KF 0和KF 1的加入都能诱发其表面的基体PA 6形成横晶,在低温下纤维的诱发横晶能力小,形成的横晶不致密、不完整;在高结晶温度Tc下形成的横晶完整而致密,纤维的诱发横晶能力大;KF 1与基体有较强的结合力,故其诱发横晶能力较KF 0强。
