A simple geometry of real pixel gas detectors has been evaluated that circumvents the limitations of a microstrips, namely aging, gain drift and flux limitation due to the dielectric
We have measured by low angle X-ray scattering (SAXS) the long period of fractionated polyethylene (P.E.) quenched from the melt. The P.E. samples were annealed at different temperatures Ti above the melting temperature and for a time greater than the relaxation time defined in Part I. As for polydispersed material, the long period is given by the relationship L(Ti) = L(To) (1 + α(T i - To)) : α is equal to β/2, β being the temperature coefficient of the ideal chain in the liquid state. Three types of behaviour are distinguished according to the value of the molecular weight M of the fractionated samples : M < M1 L ∼ M (1) M1 < M < M2 L∼ M1/2 (2) M > M2 L ∼ M1/22 (3) M1 is the critical molecular weight, above which the chain has a Gaussian behaviour in the liquid state. M1 is of the order of the molecular weight M e of a portion of chain between two entanglements. The scaling law (2) is new, the long period varies like the end to end distance of the coil in the melt. Our results indicate the necessity of introducing a critical value M2 for the molecular weight, above which the long period is constant. From WAXS and SAXS measurements the crystalline core lamella thickness lc is found to be constant, of the order of 170 Å, the distance between two consecutive entanglements along a chain. The experimental scaling laws giving L and lc give information about the process of crystallization of fractionated P.E
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