Polyamide 4.6 is a linear aliphatic polyamide which is composed of repeating tetramethylene adipamide units and which can be obtained through polycondensation of tetramethylene diamine ( or 1.4-diaminobutane ) and adipic acid. Although there are similarities between the molecular structure of PA 4.6 and that of PA66 or PA6, the higher number of amide groups per given chain length and the more symmetrical chain structure of PA 4.6 result in the higher melting
It comes from the polycondensation of TPA with two isomers C9 diamine. Polyamide 9T is suitable for continuous use at temperatures of up to 180-200°C, with some special formulations able to resist until 230°C for thousand hours and 295°C for short term, bringing it close to high-temperature plastics like PPS, LCP or PEEK.
Thanks to a 315° C melting point and a minimum requested temperature for the mold of about 140° C, it shows very good mechanical properties even at high temperature as well as very good chemical resistance properties, also in the automotive field for anti-freeze fluids, different type of gasolines, oils, fluids for brakes etc etc. It can be used for applications with temperatures of 150°C in continuous with peaks up to 250-280°C.
It combines very good mechanical properties with excellent aesthetical surface and good die ability. Available in different fiberglass reinforced grades from 10 to 60%, it has a melting point at around 260° C, with the advantage of being able to be molded with a thermo-regulated mold at 80° C. It shows good impact resistance combined with high modulus and resistance in continuous temperature at 120° C.
Polyphenylene sulfide (PPS) is a semi crystalline, high temperature engineering thermoplastic. It is rigid and opaque polymer with a high melting point (280°C). It consists of para-phenylene units alternating with sulfide linkages. The MW of LIN PPS is nearly double as compared to regular PPS. Its increased molecular chain length results in high tenacity, elongation and impact strength.
High mechanical and thermal resistance range polymers, thanks to their excellent characteristics of chemical resistance and intrinsic self-extinguishing properties. Branched polyamide presents higher MW than regular PPS. Branched PPS has improved mechanical properties, tenacity and ductility.
The PESU (polyethersulfone) is an aromatic amorphous material.
Transparent based, it has a very high long-term heat resistance, high elastic modulus, excellent fire behavior (V-0 self-extinguishing nature, even at thicknesses of 0.5 mm) and excellent electrical properties.
Compared to another supertecnopolymer, as the PEI, it has a better chemical and hydrolysis resistance, and excellent thermal performances, thanks to a 225 °C Tg value, which allows it to be used continuously for thousands of hours, up to 200 °C.
Polyphenylene sulfide (PPS) is a high performance polymer with superior chemical and solvent resistance, very high stability, excellent electrical and mechanical properties, extraordinary flame retardancy and good mold precision. It has, however, for its intrinsic rigid molecular structure, low elongation to break , limited toughness, high brittleness and a high cost.
In order to improve these adverse effects, we have blended PPS with other materials to obtain special alloys with outstanding properties. Some XILOY 57 are blended with different polyamides, able to provide significantly improved properties, in properties and processing.
This linear, amorphous copolycarbonate is most suitable for applications that must withstand high temperatures and exhibit toughness, impact resistance and high transparency. Apec® can also be utilized over a broad range of temperatures, from approximately -30ºC to approximately +200ºC. These properties, along with good dimensional stability, weatherability and flowability, allow Apec® to be utilized as a replacement for glass, metal or standard polycarbonate in high-heat applications.