The miscibility of perdeuterated isotactic polypropylene (d-PP) and ethylene-1-hexene random copolymer (EHR) blends, which were polymerized by metallocene catalyst, was investigated by small-angle neutron scattering (SANS) with changing hexene content in EHR and temperature above the melting point of d-PP. Flory-Huggins interaction parameter (χ d-PP/EHR) between two polymers was determined on the basis of random phase approximation (RPA). It was revealed that χd-PP/EHR decreases with increasing hexene content in EHR, which contain hexene ranging from 26 to 46 mol %, and with increasing temperature; however, the χ parameter between d-PP and atactic poly(1-hexene) was larger than that between d-PP and EHR with 46 mol % of hexane, and it increased with increasing temperature. Scattering intensities from d-PP and isotactic poly(1-hexene) blend could not been explained by RPA, being concluded that these two polymers are immiscible.
Processors, compilers, and networks -important materials covered by computer science curricula -are often treated independently in laboratories associated with corresponding lecture courses. An integrated laboratory called CNP for juniors majoring in computer science at the University of Electro-Communications has been developed and is now under way, where a networking protocol stack implemented by students is translated into object codes by a compiler implemented by students, which in turn are executed on a processor implemented also by students. The goals of the integrated laboratory are to deal with modern and attractive materials, to provide students with opportunities of collaborating in constructing a large system, as well as to have students share a feeling of accomplishments among them. Responses from students approved our intention and verified the effectiveness. In this paper, we describe the design and development of baseline components to be integrated, laboratory organizations and schedules, and results and evaluations of the laboratory.
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