“…It is clear that ionic NTPs develop higher stiffness and strength than nonionic NTPs. This is consistent with our previous results on different ionic NTPs [9,10]: both modulus and strength values are higher in these ionic NTPs, and these values are increased with ionic content. However, the values of ionic NTP2 are lower than those of ionic NTP1 despite higher ionic content of ionic NTP2.…”