PEOT/PBT multi-block copolymers are thermoplastic elastomers. A group of these multi-block copolymers are bioresorbable and also known as PolyActive.
The thermoplastic elastomeric properties of these multi-block copolymers are obtained by phase separation of the hydrophilic and hydrophobic segments in the polymers. Amongst other, this makes these block copolymers highly interesting for 3D printing. The polymers have a relatively low melting viscosity while after cooling very good mechanical properties result. The possibility to balance hydrophilicity/hydrophobicity of the surface makes these polymers much used for tissue engineering. The hydrophilic/hydrophobic phase separated morphology of these block copolymers is also a strong asset for the development and making of membranes with selective permeability properties.
Popular compositions are 300PEOT55PBT45, 1000PEOT70PBT30, 1500PEOT77PBT23, 3000PEOT77PBT23 and 4000PEOT77PBT23. The first number denotes the molecular weight of the PEO (PolyEthylene Oxide) incorporated. The second and third number denotes the ratio of the two blocks PEOT/PBT expressed in wt%.
We can fully customize PEOT/PBT multi-block copolymers to your requirements.
Learn more on rheological properties of PEOT/PBT block copolymers from a publication in Materials www.mdpi.com/1996-1944/12/2/226/pdf. Rheological behavior of the segmented multi-block copolymers has been studied and discussed in view of 3D printing, but is applicable to any other melt processing technique such as injection molding, compressing molding and extrusion.