Contined Crystallization Of PCL In The Organic/inorganic Hybrid System

The crystallization of the polymer materials is an important direction for Polymer Studies.This paper mainly Poly ε-caprolactone (PCL), organic/inorganic hybrid system, depth and detailed study of the crystalline morphology of PCL and its blends.PCL and SiO2organic-inorganic hybrid materials have been synthesized by sol-gel approach and the crystalline behavior of PCL in the silica networks has been investigated byFTIR,DSC,WAXD and POM. The degree of PCL crystallinity in the PCL/SiO2hybrid networks reduces with the increase of SiO2content. PCL is in an amorphous state when the concentration of PCL is lower than40wt%in the hybrid materials. The melting points of PCL in the networks are lower than that of pure PCL, but they almost have the same value. WAXD results show that when the PCL weight percentage is higher than40wt%in the hybrid samples, part of PCL can crysatllize and the PCL crystallites are almost in the same size. The crystalline PCL in the hybrid samples is relatively free from the composition of the materials, because the crystallization temperature and melting point of PCL of the samples are almost equal, and the crystalline PCL of different samples has the same crystalline structure, that means the crystalline part of PCL in the hybrid samples is unperturbed and the porous silica gel gives enough space for PCL to crystallize into the same crystalline structure and the same size crystallites.PCL and TiO2organic-inorganic hybrid materials have been synthesized by sol-gel approach and the crystalline behavior of PCL in the silica networks has been investigated by FTIR,WAXD and DSC. FTIR results show that the covalently linked to the organic component and inorganic component with increasing TiO2content in the hybrid materials, hybrid materials of the diffraction peak position remains unchanged and the diffraction peak position and PCL homopolymer basically the same, but the intensity of diffraction peaks become weak; the different components of the hybrid samples the melting temperature is slightly different, but the low melting temperature than the PCL homopolymer. Different PCL/SiO2system, when TiO2content in the hybrid materials more than60%of the hybrid material is still able to crystallization, only the degree of crystallinity is very low. Movement and crystallization behavior of the molecular chains of PCL in the hybrid system are subject to restrictions of TiO2, leading to reduce the degree of crystallinity of the PCL part of the PCL can be crystalline materials of different composition is relatively "unperturbed part". Different composition PCL/TiO2material crystallinity, but can the crystallization behavior of the crystalline portion of the same.PCL was used to study its crystalline morphology. First, the crystalline temperature and melt temperature of PCL were measured by DSC and the crystalline type was measured by XRD. POM to study the crystallization temperature, crystallization time to factors such as the crystalline morphology of PCL homopolymer. Then,use the AFM substrate material, solvents, too cold on PCL film. The results showed that:factors such as the crystallization temperature, substrate material, solvent, and the undercooling significantly PCL thin-film crystalline morphology, crystallization time changes can only affect the size of the PCL crystal, PCL crystal form and is not significantly affected.