Sdudy On High-temperature Poly(Aryl Ether)s Containing Naphthalene And Phenyl-s-triazine Moieties

Poly(aryl ether)s have developed rapidly and atracted much attentions of the researchers because of their excellent combination properties. It is regrettable that these polymers are generally difficult to dissolve. In order to improve the thermo properties of poly(aryl ether)s as well as their solubility, two tipes of rigid-structure-based groups naphthalene and phenyl-s-triazine together with the non-coplanar phthalazinone were incorporated into the main chains of PAEs. The structures and propertes of obtaned polymers were investigated with depth and detail.Three kinds of dichloro monomers containing naphthalene heve been synthesised with the revised methods in related articles. The structures of dinaphthoylbenzene (DCNB), benzoylnaphthalene (CCBN) and naphtholsulfonylnaphthalene (CCNSN) were characterized by FTIR,1H-NMR and MS. In addition, the purity and melting points of these monomers were measured by HPLC and DSC respectively.Three series of PAEs have been prepared by the nucleophilic displacement polymerization of three monomers which refer to one of the three above-mentioned monomers, difluoro triphenyl-s-triazine (BFPT) and bisphenol-like phthalazinone (DHPZ). FT-IR,1H-NMR and elemental analysis testify the consistency of obtained polymers and target polymers. After that, the intrinsic viscosities, molecular weights and solubility of these polymers were tested in succession. XRD, extensograph, DSC and TGA were utilized to explorated the crystallization behaviors, mechanical properties and thermal properties of these poly(aryl ether)s.The experiments demonstrate the resulting polymers’ amorphous structure and good solubility in common organic solvents such as NMP, TCE and chloroform. But in contrast to the the rest, C-PPEKTs possess relatively poor solubility. The C-PPESTs have highest glass transition temperatures (Tg) ranged from306℃-326℃in the three groups of polymers under the condition of the identical monomer proportions which declare the more obvious promotion of sulphonyl groups to polymers than carbonyl groups. However, the thermal decomposition temperatures for5%mass loss (Td5%) ranged from487℃-508℃which are nearly to D-PPEKTs but greater than C-PPESTs belong to C-PPEKTs. This shows that the thermostabilities of polymers containing carbonyl groups are better than those containing sulphonyl groups. The tensile strengths of D-PPEKTs are similar to C-PPESTs, the values of these two groups of polymers which are higher than C-PPEKTs exceed80GPa and79GPa respectively. The values of the elongation at break of C-PPESTs whose range is from8%to15%are lower than the other two PAEs that the same parameters are both up to18%.The influence of phenyl-s-triazine moieties on the thermal properties of polymers is more apparent than naphthalene moieties. Both of Tg values and Td values of all of the three series of obtained polymers increase with the augment of the content of phenyl-s-triazine moieties. Accordingly, the polymers’solubility become poor under this trend and the PAEs can be hardly dissolved in most common organic solvents when it achieves a certain level of the trend. And then there are tendencies that the values of the tensile strengths and tensile moduluses increase, on the contrary, the values of elongation at break decrease with the augment of the content of BFPT. It reveals that the incorporation of the phenyl-s-triazine moieties into the main chain of the macromolecules could reinforce the strength and fragility of the polymers.