Abstract
Interface properties of nano-silica/thermotropic liquid crystalline polyesters (TLCP) composites were investigated by X-ray diffraction analysis and differential scanning calorimetory. The crystallinity of TLCP in the composites drastically decreased with an increase of nano-silica content, depending on the surface area of the silica particles. Little size effects (40 - 400 nm) in the particles and strong interaction between silica surface and the C=O moieties of TLCP were observed by IR analysis. The glass transition temperature of TLCP (。C higher than that in bulk.
Highlights
Thermotropic main-chain liquid crystalline polymers (TLCPs) usually have rigid main chains and good mechanical properties, high chemical and thermal stability, which make TLCPs high performance engineering plastics widely used for electronics, automotive and aerospace applications [1]
Tg decreases with an increase of amorphous contents, and increases more than 20 ̊C with further adding SNPs of 51 nm. These differential scanning calorimetry (DSC) results suggest that smaller SNPs prevent the formation of crystal structure of the TLCP and increase the amorphous region, which was supported by the results of X-ray diffractometry (XRD)
The results of XRD and DSC showed that the addition of SNPs to the composite of the TLCP and SNPs prevents the crystallization and induces the formation of amorphous regions of the TLCP, and that these tendencies became more significant when SNPs with smaller sizes were used for the sample preparation
Summary
Thermotropic main-chain liquid crystalline polymers (TLCPs) usually have rigid main chains and good mechanical properties, high chemical and thermal stability, which make TLCPs high performance engineering plastics widely used for electronics, automotive and aerospace applications [1]. XRD, IR, differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) were carried out for composites of a copolymer of HBA and HNA, and SNPs with different sizes to investigate the size effect of SNPs with on the interfacial structural of this TLCP. This template, created in MS Word 2007, provides authors with most of the formatting specifications needed for preparing electronic versions of their papers. The formatter will need to create these components, incorporating the applicable criteria that follow
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