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Crystallization kinetics and behavior of PCL side chains in polymer co-brushes constituted with PCL and PEO side chains alternatively attached on poly(styrene-alt-maleimide) backbones have been determined using in-situ FT-IR and DSC methods. Avrami analysis shows the exponent n increasing from one at 10 °C to two at 30 °C, demonstrating confined crystallization of PCL side chains through homogeneous...
A low molecular weight (MW) poly(ethylene oxide) (PEO) crystallized in ultrathin films displays various crystal growth patterns in a crystallization temperature (T x ) range from 20.0 °C to 50.0 °C. In succession, the following patterns are found: nearly one-dimensional (1D) dendrite-like crystal patterns at T x ≤ 38.0 °C, two-dimensional (2D) seaweed-like patterns between 39.0 °C ≤ T...
We report the observation of a labyrinthine crystal pattern with a periodic structure in the crystal width direction in ultrathin films of poly(ethylene oxide) fractions with molecular weight ranging from 25,000 to 932,000 g/mol. The polymer thin films are crystallized at temperatures well below the bulk melting temperature, thus the system is characterized by limited diffusion of the polymer chains...
In this work we report our investigation on the crystal patterns of a 50/50 blend of two polyethylene oxide (PEO) fractions with different molecular weights (M¯w=5040 and 35000 g/mol) in ultra-thin films. Using AFM with a hot stage the samples on the surface of silicon wafer were isothermally crystallized at 20.0≤T c ≤60.0°C. The crystal patterns are different from those of the two pure fractions...
The fractal crystal growth process of the PEO monolayer with a molecular weight (M¯w≈2.0×106g/mol) and a distribution (M¯w/M¯n=4.24) has been followed on the substrate of the silicon wafer using AFM equipped with a hot stage. A depletion zone between the ramified crystals and the viscous amorphous layer was found in the AFM height images. The formation of the depletion zone shows that the molecules...
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