Films of an α‐cyclodextrin/poly(ε‐caprolactone) inclusion complex have been successfully prepared and show high transparency and heat resistance in comparison to the pure polymer film. The physical properties, such as transparency, mechanical properties, and thermal stability, of the α‐CD‐PCL‐IC films are found to depend on the α‐cyclodextrin‐to‐polymer stoichiometry.magnified image

ABSTRACT:The poly(e-caprolactone) (PCL)/a-cyclodextrin (a-CD) inclusion complex (PCLIC) was successfully prepared, and its effect on the thermal behavior and mechanical properties of PCL was thoroughly studied. It is shown that the addition of PCLIC greatly increased the crystallization rate and thermal stability of the PCL. The Young's modulus and yield strength of PCL/PCLIC composite are about 2 and 1.3 times of the pure PCL, and the elongation at break of the PCL/PCLIC composites kept above 350%, when the PCLIC composition is 15 wt %. It is shown that PCLIC is a good enforcing biofiller for the PCL.

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A new method for the surface modification of polyurethane (PU) nanofibers by using a hyper branched polymer containing fluoroalkyl group (FF1) was developed. PU nanofiber mats containing FF1 were obtained by using a solution electrospinning method. The effect of the addition of FF1 on the structure of the PU nanofiber mat has been investigated with a scanning electron microscope and X-ray photoelectron spectroscope. Furthermore, the physical properties of the nanofiber mats such as a contact angle measurement, water resistance test, water vapor permeation test and tensile test have been studied. X-ray results show that almost of FF1 particles are located on the near-surface region of the nanofibers. It is found that the particles improve remarkably the surface properties of PU nanofibers.