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The porous PLA foams potential for tissue engineering usage are prepared by amodified solvent casting/particulate leaching method with differentcrystallinity. Since in typical method the porogens are solved in the solutionand flow with the polymers during the casting and the crystallinity behavior ofPLA chains in the limited space cannot be tracked, in this work the processingis modified by diffusing the PLA solution into a steady salt stack. With athermal treatment before leaching while maintaining the stable structure of theporogens stack, the crystallinity of porous foams is made possible to control.The characterizations indicate the crystallization of porous foams is in amanner of lower crystallibility than the bulk materials. Pores and caves ofaround 250{\mu}m size are obtained in samples with different crystallinity. Themacro-structures are not much impaired by the crystallization nevertheless themorphological effect of the heating process is still obvious.

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The Crystallization Behavior of Porous PLA Prepared by Modified Solvent  Casting/Particulate Leaching Technique for Potential Use of Tissue  Engineering Scaffold