Abstract
The present work reports on the synthesis of an easily processable phthalonitrile monomer (BBPN) with isobutyl segment. The effect of various curing agents on curing behaviors, thermal and adhesive properties of BBPN has been evaluated. The novel phthalonitrile monomer was synthesized through nucleophilic substitution of 2,2-bis(4-hydroxyphenyl)butane (BPB) and 4-nitrophthalonitrile, and its chemical structure was characterized with FTIR, 1H NMR and 13C NMR analyses. Four different aromatic diamines derived from different catalytic activities such as p-phenylenediamine (p-PD), m-tolidine (m-TB), o-tolidine (o-TB), and 2,2′-bis(trifluoromethyl)benzidine (TFMB) were used as curing agents. The curing kinetics of BBPN/aromatic diamine samples were investigated by non-isothermal differential scanning calorimetry (DSC) at different heating rates. The average activation energy was calculated based on Kissinger’s and Ozawa’s methods varied in the range of 66.61–79.00 kJ mol−1. The thermal properties of the obtained polymers were investigated by dynamic mechanical thermal analysis (DMA) and thermogravimetric analysis (TGA). Compared to other three systems, the cured BBPN/p-PD exhibited better thermal stability and higher glass-transition temperature (Tg), suggesting its higher degree of cross-linking. Moreover, the BBPN/diamine systems were used to bond aluminum sheet, and the average values of lap shear strengths were in the range of 13.8–19.6 MPa at room temperature and 9.2–11.5 MPa at 300 °C, respectively.
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We gratefully acknowledge the financial support from the Excellent Youth Foundation of Heilongjiang Province, PR China (Grant No. 51073049).
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Liu, C., Sun, M., Zhang, B. et al. Curing kinetics, thermal and adhesive properties of phthalonitrile/aromatic diamine systems. Iran Polym J 29, 67–75 (2020). https://doi.org/10.1007/s13726-019-00775-7
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DOI: https://doi.org/10.1007/s13726-019-00775-7