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The selective dynamic crosslinking reaction by means of the N,N'-m-phenylene–bismaleimide/poly-(2,2,4-trimethyl-1,2-dihydroquinoline) system was carried out on PP/EPDM blends and its effect on the Izod impact strength (IIS) was investigated. Three series of PP/EPDM combinations were adopted to establish different morphologies. In each series, the EPDM wt % varied from 5 to 30 at 5 wt % intervals. The system crosslinked the EPDM particles selectively without PP degradation and change of morphology. Following the crosslinking, the IIS at 23, ?10, and ?30°C increased in all blends, and the critical EPDM wt % at 23°C necessary to cause the dramatic IIS increase was lowered. The increase in interfacial adhesion is considered to be the most important factor necessary for the improvement. The nucleation effect of the crosslinked particles and the decrease of crystallinity of the EPDM were also considered to contribute to the improvement in the IIS. Impact fracture energy absorption can thus be changed by adjusting the magnitude of the interfacial adhesion by the dynamic crosslinking even at essentially the same morphology. © 1995 John Wiley & Sons, Inc. 相似文献
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Two PP/EPDM blends with 30 wt % of EPDM and different morphologies were selectively crosslinked under a dynamic crosslinking reaction using the N,N'-m-phenylene-bismaleimide/poly(2,2,4-trimethyl-1,2,-dihydroquinoline) system. The resulting Izod impact strengths (IISs) were measured over a range of temperature. A transition point in the IIS curve, which is considered to dependent on the glass transition temperature (Tg) of the PP matrix, appeared to decrease by 5°C. Scanning electron microscopy (SEM) confirmed that the crosslink reaction did not affect the blends' morphology but did increase interfacial adhesion. Increased adhesion is considered to be a most important factor for shifting of the transition point, or apparent Tg, because it increases the free volume of the PP matrix under deformation. © 1996 John Wiley & Sons, Inc. 相似文献
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Oda Naoki Kurashina Seiji Miyoshi Masaru Doi Kohei Ishi Tsutomu Sudou Takayuki Morimoto Takao Goto Hideki Sasaki Tokuhito 《Journal of Infrared, Millimeter and Terahertz Waves》2015,36(10):947-960
Journal of Infrared, Millimeter, and Terahertz Waves - A pixel in an uncooled microbolometer terahertz (THz) focal plane array (FPA) has a suspended structure above read-out integrated circuit... 相似文献
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A Hg1-xCdxTe growth method is presented for molecular beam epitaxy, which precisely controls growth conditions to routinely obtain device
quality epilayers at a certain specific composition. This method corrects the fluctuation in composition x for run-to-run
growth by feedback from the x value for the former growth to the fluxes from CdTe and Te cells. We achieved standard deviation
Δx/ x of 3.3% for 13 samples grown consecutively. A substrate temperature drop was found during growth, which considerably
degrades the crystal quality of epilayers. In this method, this drop is greatly diminished by covering the holder surface
with a heavily doped Si wafer. Finally, etch pit density of 4 x 104 cm-2 and full width at half-maximum of 12 arc-s for the x-ray double-crystal rocking curve were obtained as the best values. 相似文献
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