Amorphous PA
Thermoplastics > Polyamides
Polyamide amorphous | ||||||||
By incorporating bulky segments such as aromatic carboxylic acids or branched aliphatic or alicyclic diamines in the PA molecule instead of the soft (CH2) x / y, a semi-crystalline or amorphous, hard and resistant PA is obtained with crystal transparency. A predominant double bond of the CONH groups with aromatic rings gives rise to plastics with extreme resistance to temperature (aramids). Amorphous PAs exhibit the good characteristics typical of crystalline PA, although water absorption is much lower, so they are not stained by beverages or ink. With the absorption of water increases its hardness. They are also very stable and without distortion since they hardly have post-contraction. They resist impact up to -40º C and exhibit good creep characteristics to practically their high glass transition temperature. | ||||||||
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