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Nano-phase Microstructure of Poly(ε-caprolactone)/Silica Hybrids and Its Crystalline Nucleation and Growth
Nie Kangming*1,2, Pang Wenmin2, Wang Yusong2, Lu Fei2, Zhu Qingren2
1.School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039;2.Structure Research Laboratory, University of Science and Technology of China, Hefei 230026
Abstract:
The nano-phase microstructure of high molecular weight poly(ε-caprolactone) (PCL) /silica hybrid materials, in which polymeric and inorganic component are coupled by hydrogen bonding, and nucleation and growth of PCL chain in the hybrids were studied by scanning electronic microscopy, wide-angle X-ray diffraction and differential scanning calorimetry. The results show that the micro-phase separation in the hybrids occurs at the nano-meter scale. The average scale of the polymeric domain is about 70 nm. The morphological structure of the inorganic component appears as irregular particles. The uniform distribution of two phases relates to the bonding strength of hydrogen bonding between components in the hybrids. After a PCL is hybridized, the relative degree of crystallinity decreases and the corresponding scale of microlite change. In addition, with inorganic content increasing, the equilibrium melting points of the PCL in hybrids decrease. The energy that polymeric chains fold to form crystals on the surface of crystal nucleus increases. This result is due to the influence of silica and the bonding strength in hybrids.
Key words:  Poly(ε-caprolactone), Organic-inorganic hybrids, Micro-structure, Nucleation and growth
FundProject:
PCL/SiO2杂化纳米相微结构与晶态成核生长特性
聂康明*1,2, 庞文民2, 王雨松2, 鲁非2, 朱清仁2
1.安徽大学化学化工学院材料系,合肥,230039;2.中国科学技术大学结构分析重点实验室,合肥,230026
摘要:
应用扫描电子显微镜、广角X射线衍射和差示扫描量热手段研究了有机高分子/无机组分间以物理次价力(氢键)键合的高分子量PCL/SiO2杂化材料纳米相微结构和PCL高分子链在该微结构环境中的结晶成核生长特性及其影响因素.研究结果表明:杂化体系中高分子/无机组分间的微相分离尺度在纳米数量级,高分子微区的平均相畴尺寸在70 nm左右,无机相形态呈现不规则的颗粒状.两相均匀分布程度与体系中组分间的氢键键合强度有关.PCL杂化后结晶度减小,对应的微晶尺寸明显改变,平衡熔点随无机组成含量的增加而下降.高分子链在晶核表面折
关键词:  聚己内酯  有机-无机杂化材料  微结构  结晶成核生长
DOI:10.1088/1674-0068/18/6/1023-1028
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