Novel poly(arylene ether nitrile) containing pendant aliphtatic ring in the chain: Synthesis and properties

Two kinds of novel poly(arylene ether nitrile)s (CPDP-DCBN and CHDP-DCBN) containing pendant aliphtatic ring were synthesized by 4,4(')-cyclopentane-1,1(')-diyldiphenol (CPDP) or 4,4(')-cyclohexane-1,1(')-diyldiphenol (CHDP) and 2,6-dichlorobenzonitrile (DCBN) in this work. The inherent viscosities of poly(arylene ether nitrile)s (PENs) were in the range of 0.701-0.806 dL g(-1). The polymers showed high glass transition temperatures (T- g ) of 185.4-196.4 degrees C and weight-loss temperatures (T-5%) of 447.8-454.3 degrees C. The obtained CPDP-DCBN and CHDP-DCBN could be hot pressed into the films, which showed the tensile strengths of 82.6 MPa and 86.8 MPa, respectively. And the storage modulus of CPDP-DCBN and CHDP-DCBN were about 1.0 GPa and 1.5 GPa at 150 degrees C, respectively. Additionally, the PENs could be dissolved in many solutions at room temperature, such as NMP and concentrated H2SO4, indicating that they had good solubility; they can be processed by the solution method. Meanwhile, the optical transmittance of CPDP-DCBN was 78.1% at 450 nm; it has potential to be applied to the heat-resistant optical film.