Thermal properties of acrylate and methacrylate monomers containing long-fluorocarbon chains (H(CF2)nCH2OCOCH=CH2, (F.A)and H(CF2)nCH2OCOC(CH3)=CH2, (FnMA), where n=6, 8, 10) and their comb-like polymers have been investigated by differential scanning calorimeter (DSC) and X-ray diffraction. The comb-like polymers (PF10 A and PF10MA ) with sufficiently long-fluorocarbon chains showed a simple melting and crystallizing behavior. For the fusion of PFIoA in 1st heating, enthalpy change AHf was 18 kJ mo1-1 and entropy change ASf was 45 J K -1 mo1-1, while for PF10MA the values AHf and ASf were 5.3 kJ mol -l and 14 J K -1 mol -I, respectively. Melted PFsA crystallized slowly, whereas PFsMA with same fluorocarbon chain and also both of PF6A and PF6MA with shorter fluorocarbon chains can hardly crystallize by the aggregation of side-chains. Effects of the length of side-chain and the flexibility of main chain on the side-chain crystallization of comb-like polymers are clear. Crystallization process of the methacrylate monomers was sensitively affected by the scanning rate of DSC measurement and the length of fluorocarbon chains.
The research theoretically analyzes the system specifications and designs the experiment to verify the effect of the discrete profile of the grating on the profilometry precision of the novel 2D single-shot comb-based interferometer.
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