A calorimetric study of the process of formation of a supramolecular high-density polyethylene structure in mixtures with different oxides after plastic deformation under high pressure
Mixtures of ultrahigh-molecular-weight polyethylene with 95 wt % oxides of different elements were subjected to plastic deformation under the pressure of 1 GPa at a high pressure device of the Bridgman anvil type and thermal effects were studied using the DSC technique. Thermograms contained exothermic peaks with a maximum at 50–90°C related to cold crystallization of the polymer. The process of polymer fusion was described by two peaks with the maximums at T 1 = 125–128°C and T 2 = 136–139°C. The low-temperature peak was related to fusion of a structure with high amounts of defects formed on the oxide surface.
To deal with the market demand and the production organization feature of steel making enterprises,we formulate the optimization of charge design as a cluster analysis problem with quality constraints on chemical compositions.A particle-swarm-optimization-based(PSO-based) solution is proposed for reducing the dimensions based on the principal component analysis(PCA) techniques.The range constraints of chemical compositions for products with similar quality are introduced in terms of traditional process constraints,due time constraints and furnace capacity constraints,etc.The solution adopts an integration schema for charge plan and quality design.It performs the cluster analysis for candidate products with similar chemical compositions and constraints to realize the optimal charge design under quality constraints on steel products of multiple varieties and in small batch demands.