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首页> 外文期刊>Journal of Applied Polymer Science >Microscopic Surface and Bulk Morphology of Semicrystalline Poly(dimethylsiloxane)-Polyester Copolymers
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Microscopic Surface and Bulk Morphology of Semicrystalline Poly(dimethylsiloxane)-Polyester Copolymers

机译：半结晶聚（二甲基硅氧烷）-聚酯共聚物的微观表面和本体形态

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摘要

In this study, two series of semicrystalline poly(dimethylsiloxane) (PDMS)-polyester segmented copolymers with various PDMS contents were synthesized. One series was based on polybutylene adipate (PBA) as the polyester segment and the other was based on a polybutylene cyclohexanedicarboxylate ester (PBCH) segment. The copolymers were characterized using H-1-nuclear magnetic resonance, size exclusion chromatography, dynamic mechanical analyses, differential scanning calorimetry (DSC), and wide-angle X-ray diffraction (WAXD). The microscopic surface morphology and the microscopic bulk morphology were investigated using atomic force microscopy (AFM) and transmission electron microscopy, respectively. The effects of the polyester type and the PDMS content on the crystallinity degree as well as the copolymer surface and bulk morphology at room temperature were investigated for each series. DSC and WAXD results showed the ability of the copolymers to crystallize, to various degrees, depending on the polyester type and the PDMS content. The results showed that the PDMS content had a greater influence on the crystallinity degree in the PDMS-s-PBCH (cycloaliphatic) copolymer series than in the PDMS-s-PBA (aliphatic) copolymer series. In the copolymers with a low PDMS content, the AFM images showed spherulitic crystal morphology and evidence of PDMS nanodomains in between the crystal lamellae of the ester phase on the copolymer surface. A heterogeneous distribution of the PDMS domains was also observed for these copolymers in the bulk morphology as a result of this segregation between the polyester lamellae. All the copolymers, in both series, showed microphase separation as a result of the incompatibility between the PDMS segment and the polyester segment. Three types of surfaces and bulk morphologies were observed: spherical microdomains of PDMS in a matrix of polyester, bicontinuous double-diamond type morphology, and spherical microdomains of polyester in a matrix of PDMS as the PDMS content increases.
机译：在这项研究中，合成了两个系列的具有不同PDMS含量的半结晶聚（二甲基硅氧烷）（PDMS）-聚酯链段共聚物。一个系列基于聚己二酸丁二酯（PBA）作为聚酯链段，另一个系列基于聚丁烯环己烷二羧酸酯（PBCH）链段。使用H-1核磁共振，尺寸排阻色谱，动态力学分析，差示扫描量热法（DSC）和广角X射线衍射（WAXD）对共聚物进行表征。使用原子力显微镜（AFM）和透射电子显微镜分别研究了微观表面形态和微观本体形态。对于每个系列，研究了聚酯类型和PDMS含量对室温下结晶度以及共聚物表面和本体形态的影响。 DSC和WAXD结果表明，共聚物具有不同程度的结晶能力，具体取决于聚酯类型和PDMS含量。结果表明，PDMS含量对PDMS-s-PBCH（脂环族）共聚物系列的结晶度的影响大于PDMS-s-PBA（脂环族）共聚物系列的结晶度。在具有低PDMS含量的共聚物中，AFM图像显示出球状晶体形态，并且在共聚物表面上的酯相的晶体层之间存在PDMS纳米域的证据。由于聚酯薄片之间的这种分离，对于这些共聚物，在本体形态上也观察到PDMS结构域的不均匀分布。由于PDMS链段和聚酯链段之间的不相容性，两个系列的所有共聚物均显示出微相分离。观察到三种类型的表面和本体形态：在聚酯基质中PDMS的球形微区，双连续双金刚石型形态，以及随着PDMS含量增加，在PDMS基质中聚酯的球形微区。

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