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首页> 外文期刊>Journal of Applied Polymer Science >Relation betwen the Phase Structure and Surface Structure of Films Made from Polyurethane Dispersions
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Relation betwen the Phase Structure and Surface Structure of Films Made from Polyurethane Dispersions

机译：聚氨酯分散体薄膜的相结构与表面结构之间的关系

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摘要

Segmented polyurethaen dispersions (SPUD) having carboxyl groups in soft segments (SS) or hard segments (HS) were synthesized. Phase, surface, and interface structures of films made from those SPUD were examined by differnetial scanning calorimeter (DSC), contact angle, and X-ray photoelectron spectroscopy (XPS) measurements. Segmented polyurethanes (SPU) with the same structures as PSUD were also synthesized in the organic solvent system, and the properties and behaviors of these PSU films were compared with the SPUD having carboxyl groups in the soft segments (S-SPUD) had higher crystallinity and crystal growth rate than the film made from SPUD having carboxyl groups in the hard segments (H-SPUD) in spite of steric hindrance. On the other hand, the film made from SPU having carboxyl groups in the hard segments (H-SPU) had higher crystallinity than the film made from SPU having carboxyl groups in the soft segments (S-SPU). Further, the crystal growth rate of SPU was faster than that of SPUD, regardless of the position of carboxyl groups. These results indicated that the phase structure of SPUD film was affected by the phase structure in the dispersion particle. Surface and interface structure of SPUD film was rearranged with a change of the phase structure. But the degree of this change was higher in the surface structure than in the interface structure.
机译：合成在软链段（SS）或硬链段（HS）中具有羧基的分段聚脲分散体（SPUD）。通过差示扫描量热仪（DSC），接触角和X射线光电子能谱（XPS）测量来检查由SPUD制成的薄膜的相，表面和界面结构。在有机溶剂体系中还合成了具有与PSUD相同结构的嵌段聚氨酯（SPU），并将这些PSU膜的性能和性能与在软链段中具有羧基的SPUD（S-SPUD）进行了比较，发现其结晶度更高。尽管具有位阻，但其晶体生长速率要高于由在硬链段中具有羧基的SPUD制成的薄膜（H-SPUD）。另一方面，由在硬链段中具有羧基的SPU制成的膜（H-SPU）具有比由在软链段中具有羧基的SPU制成的膜（S-SPU）更高的结晶度。此外，无论羧基的位置如何，SPU的晶体生长速度都比SPUD的晶体生长速度快。这些结果表明，SPUD膜的相结构受分散颗粒中的相结构影响。 SPUD膜的表面和界面结构随着相结构的变化而重新排列。但是，这种变化的程度在表面结构中比在界面结构中高。

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