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Morphology and orientation of cellulose in the vessels of vascular bundles of wheat straw were studied. The results indicated that cellulose acts as the framework in the vascular bundles and cellulose chains are high in orientation. In the thickening part of the vessels, cellulose exists in the form of cellulose crystalline lamellae but not cellulose microfibrils. The crystalline lamellae are perpendicular...
A poly(bisphenol A octane ether) (BA-C8) was synthesized. The isothermal spherulitic growth process was studied in situ using atomic force microscopy (AFM) at room temperature. For spherulites formed by homogeneous nucleation, the growth process includes the birth of a primary nucleus, the development of a founding lamella and the growth of the founding lamella into a spherulite. An embryo below a...
The isothermal crystallization behaviors of poly(bisphenol A-co-decane ether) (BA-C10) at different temperatures were studied in situ by means of Fourier transform infrared spectroscopic (FT-IR) measurements. Conformational changes during the induction period were investigated in details. The results suggest that conformational changes of polymer chains always take place before the start of changes...
The isothermal crystallization behavior of a poly(bisphenol A-co-decane) (BA-C10) at 35 o C was studied in situ using polarized optical microscopy, atomic force microscopy (AFM) and Fourier transform infrared spectroscopic (FT-IR) measurements. Real-time FT-IR investigation revealed that an increase in regularity as well as intermolecular chain packing of certain functional groups of the BA-C10...
New kinds of solid-solid phase change materials (PCMs) with netted structure have been prepared. In these new materials, the rigid polymer cellulose diacetate (CDA) serves as skeleton, and the flexible polymer polyethylene glycol (PEG) serves as functional branch chain. The transition mechanism of these functional polymers is the transfer between the amorphous and crystal states of the PEG. During...
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