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Fig. 1 Researchers have developed a soft, flexible material with adaptive durability that strengthens upon impact, suitable for wearable technology and medical sensors. Credit: SciTechDaily.com

Fig. 2 This flexible and conductive material has ??adaptive durability,?? meaning it gets stronger when hit. Credit: Yue (Jessica) Wang

???????????American Chemical Society??2024??3??31?????????????????????漣:?????????????б???????Science??s Latest Marvel: Electronic Material That Grows Tougher on Impact????

??????????????????????????????cornstarch slurries???????????????????????????????????????????????á?

???????????????????????????????????????????????????????????????????????????????о??????????????????????????????????????????????ζ???????????????????????????????????????磬?????????????豸???????????????????????

?о???????????????(American Chemical Society???ACS)2024???????飨ACS Spring 2024???????????????о??????ACS2024????????λ????飨Scenes from the ACS Spring 2024 hybrid meeting in New Orleans??????2024??3??17~21???????????????????;???????п????????12000???????????

?????????У?Inspiration From Cooking Ingredients??

???????????????????????????????????????????????????????о????????????????{Yue (Jessica) Wang}?????:???????????????????????????????????????????????????????ó??????????????????????????????????????????????????????????????????????????????????????????????adaptive durability??????????????????????????????????????嵼???????????????????

??????о??????Di Wu??????????????????????????????????????????????????????????????????????????

?????????Development of the Material??

?????????????????????????????????о????????????????????????ù?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????·?У??University of California, Merced???????????????????????????????????????????????????????????????????????????е???????????

??????о???????????????????????:??????????????(2-???????-2-?????????){poly(2-acrylamido-2-methylpropanesulfonic acid)}???????????????polyaniline molecules???????????????Ｔ??(3,4-??????????) : ????????????{ poly(3,4-ethylenedioxythiophene) : polystyrene sulfonate???PEDOT : PSS}????????????????????????????????о?С???????????????????е?????

????????????Enhancing Material Properties??

??????????????????????????????????????λ????????????????????????е??????????????????????????10%??PEDOT : PSS????????????????????????????????????????????????????????????????????PEDOT??PSS??????????????????????

??4??????2?????????2???????????????????????????????????????????????????о?????????????????????????????????????????????????????????????????????????????????????????о?С????????????????????????????????????????????????????????????????????????

???????????????????С?????????????????????????????????????????????????????????е????????????о?С??????????ɡ???????????????????в????????????????????????θ?????????????????????????????????????

????????????????????1,3-????????1,3-propanediamine?????????????????????????????????????????????????????????????γ?????????????????????????????????????????????????Σ????????????????????????????????spaghetti strings??????

???????????????????м??????????????????????????????????????

?????ú?δ????????Advanced Applications and Future Work??

?????????δ??????????????????????????????????????????????????????????豸???????????????????????洫???????????????????????????????????????????????????????????????????????3D?????????????????汾???????????????????????????????????????????????personalized electronic prosthetics?????????????????????????汾??????3D???????????????κ???????????

??????????????????????????????ζ??δ?????????????豸???????????????г????????????????????????????????????????????????????к?????????????????????????????????????????????????η?????

?????о????????????????????·?У??University of California, Merced?????????????????????????National Science Foundation CAREER grant?????????????÷??????????????????????о??????Arnold and Mabel Beckman Foundation??s Young Investigator award??????????

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Hitting this stretchy, electronic material makes it tougher

Scenes from the ACS Spring 2024 hybrid meeting in New Orleans

Effect of additives on deformation rate-adaptive conducting polymers

Abstract 

Deformation-rate adaptive properties endow polymeric materials with higher strength, elongation at break, and toughness under faster impact. A conductive polymer system consists of two polyelectrolyte complexes, polyaniline:poly(2-acrylamido-2-methyl-1-propanesulfonic acid (PANI:PAMPSA) and poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), along with 35 wt% propanesulfonic acid (PSA) and 10 wt% water as plasticizers, showed deformation-rate adaptive behavior. Our previous work suggested that the adaptive behavior is likely due to the disintegrating of the micelles formed by hydrophobic PANI and hydrophilic PAMPSA under fast deformation rates, while the additive (i.e., PSA) is hypothesized to tune adaptive behavior via affecting the formation of micelles. To fully decipher the role of additives, the same polyelectrolyte system containing negatively-charged PSA, positively-charged 1,3-propanediamine (13DA), or neutral glycerol (Gly) were investigated. While the rate-adaptive behavior was confirmed by tensile testing in the samples with all the three additives, 13DA showed the greatest improvement of Young??s modulus, tensile strength, elongation at break, and toughness at higher deformation rates. Oscillatory shear and stress-relaxation studies reveal that the deformation-rate adaptive behavior originated from the transient networks formed by the agglomeration of hydrophobic PANI and PEODT segments in our materials. The positively-charged, basic additive, 13DA, could further facilitate the formation of networks by screening the polyelectrolyte interactions and bridging the polyanions. This study unearths the mechanism of deformation-rate adaptive behavior in this model polymer system, and it can be potentially applied on fabricating other novel and robust polymeric materials.