Poly(1,3,4-oxadiazole-amide)s with pendant acetoxybenzamide or imide groups

Authors: Sava, Ion; Hamciuc, Corneliu

Source: Designed Monomers & Polymers, Volume 8, Number 3, 2005 , pp. 249-263(15)

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Abstract:

Two series of aromatic poly(1,3,4-oxadiazole-amide)s containing various pendant groups were synthesized by solution polycondensation of aromatic diamines having preformed 1,3,4-oxadiazole rings with diacid chlorides incorporating acetoxybenzamide, phthalimide or tetrachlorophthalimide side units. These polymers were soluble in polar amidic solvents and gave transparent flexible films. They showed good thermal stability, with initial decomposition temperature being about 300°C for polyamides with pendant acetoxybenzamide units and 400°C for the polyamides having pendant phthalimide or tetrachlorophthalimide groups. The glass transition temperatures of the polymers were in the range of 245–327°C. The polymer films showed the dielectric constant in the range of 3.32–4.90 and good mechanical properties with tensile strength in the range of 35–86 MPa, tensile modulus in the range of 0.235–2.66 GPa and elongation to break in the range of 15–24%. Conformational parameters of the polymers were calculated by using the Monte Carlo method with allowance for hindered rotation. Several physical properties of these polymers such as solubility, glass transition temperature and initial decomposition temperature were measured and discussed in relation with the rigidity of their chains.

Keywords: AROMATIC POLYAMIDES; CONFORMATIONAL PARAMETERS; PENDANT GROUPS; THERMAL PROPERTIES; DIELECTRIC PROPERTIES

Document Type: Research article

DOI: http://dx.doi.org/10.1163/1568555053993943

Publication date: 2005-09-01