Thermal behavior of nylon 6 copolyamides containing aromatic rings

Abstract

synopsisThe thermal behavior of terpolymers of caprolactam (CL) and of hexamethylenediammonium isophthalate (IH) and terephthalate (TH) has been studied in a wide range of compositions by differential thermal analysis. It has been found that either amorphous or crystalline polymers having different crystallization rates can be obtained by changing the composition. The dependence of melting points and glass transition temperatures on the composition has been investigated. The dependence of T, on the composition for the copolymers C L I H , IH-TH, and C L T H has been described by means of the GordonTaylor equation. It has been found that this equation fits the experimental data for the IH-TH system only if a parameter which takes into account interactions between the monomeric units is introduced. A ternary iso-T, map has been obtained through statistical analysis. The influence of the chain stiffness and bulkiness of the monomers on the glass transition temperature is diseussed.

Structure‐property relationships of copolyamides. I. Thermal properties and crystallization

“…The slopes are also calculated by the least-squares method and the crystalline and amorphous fractions of comonomer are also determined by eqs. (4) and (5). The results are listed in Table IV.…”

Isothermal and nonisothermal crystallization kinetics of a semicrystalline copolyterephthalamide based on poly(decamethylene terephthalamide)

“…Polyterephthalamides (PTPAs) are partially aromatic polyamides consisting of terephthalic acid and aliphatic diamine monomer units. To lower melting points and to improve their processability, additional monomers, such as isophthalic acid,1 adipic diacid,2 and ε‐caprolactam,3 may be included as comonomers [e.g., poly(hexamethylene terephthalamide) (PA‐6T)]. The resultant PTPAs may be either amorphous or semicrystalline, depending on their composition 4.…”