Supramolecular thermoplastic elastomer with thermally scratch repairable effect from 3‐amino‐1,2,4‐triazole crosslinked maleated polyethylene‐octene elastomer/nylon 12 blends

Abstract

In this study, nylon 12 (5-25 wt %) was melt blended with a supramolecular thermally repairable thermoplastic elastomer (ATA-POE), which was generated by crosslinking of maleated polyethylene-octene elastomer (mPOE) with 3-amino-1,2,4-triazole (ATA), in an internal mixer. The effect of nylon 12 content on the phase morphology, thermomechanical properties, and thermally triggered scratch repairing effects of the ATA-POE/nylon 12 blends was investigated. Scanning electron microscopy results showed that nylon 12 formed a dispersed phase with submicron scale in a continuous ATA-POE phase. Fourier transform infrared spectroscopy and differential scanning calorimetry analysis revealed that there are extensive hydrogen bonding interactions between the ATA-POE and nylon 12 in the blends, which was manifested by a decrease in the melting temperature of each polymer component. Tensile and dynamic mechanical test showed that tensile modulus increased with increasing nylon 12 contents in the blend with maintaining fairly high elastic recoverability. Furthermore, the blends containing up to 20 wt % of nylon 12 showed good scratch repairing effects when they are heated above melting temperature of the ATA-POE phase in the blend.

Triple-shape memory effects of modified semicrystalline ethylene–propylene–diene rubber/poly(ε-caprolactone) blends

“…The spectrum of A-EPDM showed peaks at 1640 cm À1 and 1526 cm À1 corresponding to amide groups and at 1728 cm À1 corresponding to AC@O of hydrogen-bonded carboxylic acid groups. These results confirmed that maleic anhydride group of mEPDM reacted with the amino group of ATA to form extensive hydrogen bonding interactions between modified EPDM chains, as discussed in our previous articles [8,27].…”

“…The amide peak of the blend shifted from 1640 cm À1 and 1526 cm À1 for neat A-EPDM to 1636 cm À1 and 1528 cm À1 , respectively, in the blend and the ACAOACA band of PCL shifted from 1108 cm À1 for neat PCL to 1103 cm À1 in the blend. The shifting and broadening of the carbonyl peaks suggests hydrogen bonding interactions between A-EPDM and PCL in the blends [10,27]. Fig.…”

“…The melting temperature (T m ) of the sample was determined from the second heating scans. The degree of crystallinity (v c ) of the A-EPDM and PCL phase in the blends were calculated using heat of fusion per gram of each measured component in the blend together with 100% crystalline LDPE (289 J/g) [27] and 100% crystalline PCL (136 J/g) [28]. The PCL weight fraction in the blend was measured as the ratio of the heat of melting of PCL in the blend to the heat of melting of neat PCL [29].…”