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Most unmodified polymers such as rigid PVC, PMMA, PS, or SAN are brittle
materials at ambient temperature. Even pseudo-ductile engineering polymers, such
as PC, PA, or PE, will exhibit a brittle-to-ductile transition temperature and
limited impact strength.
In consequence, most polymers have to be impact modified in order to satisfy
end-use requirements for rigid applications. In all cases, the problem can be
solved by incorporating rubber domains into the polymer matrix. However, the
nature and the size of the elastomeric phase has to be adapted to each polymer
matrix. In most cases, it is also desirable to use the minimum amount of rubber
modifier, in order not to affect other physical properties such as modulus.
The most important characteristics of an impact modifier are :
The rubber glass transition temperature
The rubber domain particle size in the matrix
The quality of dispersion
The adhesion to the polymer matrix
Among the families of plastic tougheners, Acrylic core-shell impact modifier
(AIM) can be used in materials like PVC, some engineering polymers and particularly
for outdoor applications.
We propose the following items to aid product development requiring impact performance:
