【摘 要】
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By changing both the monomer composition and the polymer structure,we have varied the mechanical properties of resorbable polymers.The polymers were synthesized
【机 构】
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Department of Fiber and Polymer Technology
论文部分内容阅读
By changing both the monomer composition and the polymer structure,we have varied the mechanical properties of resorbable polymers.The polymers were synthesized by ring-opening polymerization using L-lactide(LLA),ε-caprolactone(εCL),trimethylene carbonate(TMC)and 1,5-dioxepan-2-one(DXO)as monomers.Well-defined triblock copolymers,microblock copolymers and networks have been evaluated,and comparisons between them show that it is possible to tune the mechanical properties.Triblock copolymers with an amorphous middle block of poly(1,5-dioxepan-2-one)(PDXO) and semi-crystalline end-blocks of poly(ε-caprolactone)(PCL)were stronger and had a higher strain at break than triblock copolymers with poly(L-lactide)(PLLA)as end-blocks.Polymers with both DXO and TMC in the amorphous middle-block and PLLA as end-blocks showed a lower stress at break,but the material gained elasticity,a property which is very valuable in tissue engineering.Mechanical properties of networks,synthesized by a novel method,containing PDXO and PCL are also presented.Although it is difficult to compare them with the uncross-linked polymers,this is an additional way to modify and widen the properties.
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