Hello and welcome to a new post. In this post I provide you engineering comparison data of the 5 most used PPA base polymers and their glass-fiber reinforced compounds. Semi-aromatic polyamides are used when the aliphatic counterparts reach their limits due to high temperature and/or mechanical loads.
The five base
polymers of PPA are:
-PA 6T/6.6
-PA 6T/6I/6.6
-PA 6T/6I
-PA 6T/DT
-PA 10T/X
The data are shown
in property vs. density plots and we are comparing the semi-aromatic polyamides
to aliphatic polymers.
Background
Semi-aromatic
polyamides have an amide linkage together with an aromatic ring. The aromatic
content is most of times derived from 2-methylpentanediamine (DT), terephthalic
acid (TPA) and/or isophthalic acid (IPA). In general, the aromatic structure
helps to increase the glass transition temperature, which in turn increases the
thermal and chemical resistance. Furthermore, reduction in water uptake is
achieved. More details can be found in this post.
The following properties are presented in
the below infographic (PPA reinforced with 50% glass fibers):
-Glass transition temperature
-Melt temperature
-Tensile strength (dry as moulded;
conditioned)
-Tensile modulus (dry as moulded;
conditioned)
-Heat Deflection Temperature (HDT; 1.8 MPa)
-Izod notched impact strength
 |
| Design Properties for Engineers – Comparison Property Data of Polyphthalamides (PPAs) |
Thanks for reading and
#findoutaboutplastics
Greetings,
Herwig
Interested to talk with me about your plastic selection and part design needs - here you can contact me
Literature:
[1] D. Kemmish: Practical Guide to High
Performance Engineering Plastics, Smithers
[2] D. Glasscock: High Performance
Polyamides Fulfill Demanding Requirements for Automotive Thermal Management
Components, DuPont Engineering Polymers
[3] Eurotec: Tecomid High Performance
Compounds
[4] Saechtling Kunststoff Taschenbuch,
Hanser
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