Abstract
Simultaneous enhancement of conductivity and mechanical properties for polyaniline/polymer nanocomposite still remains a big challenge. Here, a reverse approach via in situ polymerization (RIP) of vinyl monomers in waterborne polyaniline dispersion was raised to prepare conductive polyaniline (GPANI)/polyacrylate (PMB) interpenetrating polymer (GPANI-PMB) nanocomposite. GPANI/PMB physical blend was simultaneously prepared as reference. The conductive GPANI-PMB nanocomposite film with compact pomegranate-shape morphology is homogeneous, ultraflexible and mechanically strong. With incorporating a considerable amount of PMB into GPANI via the RIP method, only a slight decrease from 3.21 to 2.80 S/cm was detected for the conductivity of GPANI-PMB, while the tensile strength significantly increased from 25 to 43.5 MPa, and the elongation at break increased from 40% to 234%. The water absorption of GPANI-PMB3 after 72 h immersion decreased from 24.68% to 10.35% in comparison with GPANI, which is also higher than that of GPANI/PMB. The conductivity and tensile strength of GPANI-PMB were also much higher than that of GPANI/PMB (0.006 S/cm vs. 5.59 MPa). Moreover, the conductivity of GPANI-PMB remained almost invariable after folding 200 times, while that of GPANI/PMB decreased by almost half. This RIP approach should be applicable for preparing conventional conductive polymer nanocomposite with high conductivity, high strength and high flexibility.
Highlights
With the development of 5G technology and artificial intelligence (AI) technology, wearable, portable and stretchable devices will be of significant and widespread utilization, with extensive applications in the fields of motion detection, health monitoring, and artificial intelligence [1]
transmission electron microscope (TEM) images showed that the colloidal particles of GPANI-PMB3 with smaller particle size dispersed in a more homogeneous way in comparison with that of GPANI/PMB (Figure 1c,d)
Significant aggregation was observed for GPANI/PMB, and precipitate appeared at the bottom of the sample vial after 60-day storage
Summary
With the development of 5G technology and artificial intelligence (AI) technology, wearable, portable and stretchable devices will be of significant and widespread utilization, with extensive applications in the fields of motion detection, health monitoring, and artificial intelligence [1] This trend substantially increases the demand for high-performance and functional elastic materials [2]. PANI has obtained increasing attention in recent decades owing to its unique functions such as simple synthesis, having a promising capability in conductivity, photoelectric properties [13], electrocatalytic activity [14], thermal stability [15], remarkable energy storage characteristics [16] and good environmental stability [17] It has been widely used in sensors [18], biosensors [19], biofuel cells [20] and electrochromic devices [21]. The water resistance was destined to be poor when the pure hydrophilic poly (vinyl alcohol) was mainly used as polymer matrix
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