17 resultados para Pe riodique e lectronique (Descripteur de forme)

em Chinese Academy of Sciences Institutional Repositories Grid Portal


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PPPEPPPP-b-PE6511PP-b-PEPP-b-PEPP-b-PEPP-b-PENMRDSCFT-IRAFMn4-CH2-nPP-b-PEAFMPP-b-PEPP-b-PEPP-b-PEPP-b-PEPP-b-PEPP-b-PE

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PP-PEPP/HDPEEPCPP-PE-PP-PE_(200)"C~(13)NMRPP-PETEMPP-PEPP/HMWPEPP-PEPEHMWPE-SEMPP-PEHMWPEPP/HDPEPP-PEHMWPEEPC-HMWPEPP/HDPEPEHMWPEHMWPE-PP/HMWPEPP/HDPESEMPP/HDPEPP/HMWPEPP/HMWPEPP-PE

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PE(portable executable),PEPE,MD5CRC32hashAPI,,

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A method was adopted to fix a series of polymers of PE-b-PEO with different PEO/PE segments on the chains of LLDPE. Maleic anhydride (MA) reacting with hydroxyl group of PE-b-PEO (mPE-b-PEO) was used as the intermediate. The structures of intermediates and graft copolymers were approved by H-1 NMR and FTIR. XPS analysis revealed a great amount of oxygen on the surface of grafted copolymers although the end group of PEO was fixed on the LLDPE chains through MA. Thermal properties of the graft copolymers as determined by differential scanning calorimetry (DSC) showed that PE segments in the grafted monomers could promote the heterogeneous nucleation of the polymer, increase T., and crystal growth rate.

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PE-g-PB-g-MA/PA6PE-g-PB-g-PA6,TEMXPSXRDDSC,PA6,,(10/min)

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,PP b PE,1 3C NMR,DSC,FT IR

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PP/TAIC()/PESEMDDV,TAICPP/PE,

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The effects of lamellar thickness on the epitaxial crystallization of polyethylene on the oriented isotatic polypropylene have been studied by means of transmission electron microscopy. The results obtained from the bright field electron microscopy and electron diffraction show that the epitaxial orientation of the PE crystals on the iPP substrate depends not only on the thickness of the oriented iPP lamellae, but also on the lamellar thickness of PE crystals. No epitaxial orientation relationship between PE crystal and iPP substrate can be found, when the PE crystals are thicker than the lamellar thickness of iPP along the matching direction. This suggests, that the epitaxial nucleation of PE in the PE/iPP epitaxial system is controlled not only by the chain-row matching, but also by a secondary nucleation process.

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(TAIC)(TMPTMA)PP/PE,TAICTMPTMAPP/PE,,

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The morphology and mechanical properties of polypropylene/high-density polyethylene (PP/HDPE) blends in a wide range of compositions modified by a sequential Ziegler-Natta polymerization product (PP-PE) have been investigated. PP-PE contains multiple components such as PP, ethylene-propylene copolymer (EPC), and high molecular weight polyethylene (HMWPE). The effects of PP-PE on the mechanical properties and morphology of the PP/HDPE blends are the aggregative results of all its individual components. Addition of PP-PE to the blends not only improved the tensile strength of the blends, but the elongation at break increased linearly while the moduli were nearly unchanged. Morphological studies show that the adhesion between the two phases in all the blends of different compositions is enhanced and the dispersed domain sizes of the blends are reduced monotonously with the increment of the content of PP-PE. PP-PE has been demonstrated to be a more effective compatibilizer than EPC. Based on these results, it can be concluded that the tensile strength of the blends depends most on the adhesion between the two phases and the elongation at break depends most on the domain size of the dispersed component. (C) 1995 John Wiley & Sons, Inc.

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Morphology and mechanical properties of polypropylene (PP)/high density polyethylene (HDPE) blends modified by ethylene-propylene copolymers (EPC) with residual PE crystallinity were investigated. The EPC showed different interfacial behavior in PP/HDPE blends of different compositions. A 25/75 blend of PP/HDPE (weight ratio) showed improved tensile strength and elongation at break at low EPC content (5 wt %). For the PP/HDPE = 50/50 blend, the presence of the EPC component tended to make the PP dispersed phase structure transform into a cocontinuous one, probably caused by improved viscosity matching of the two components. Both tensile strength and elongation at break were improved at EPC content of 5 wt %. For PP/HDPE 75/25 blends, the much smaller dispersed HDPE phase and significantly improved elongation at break resulted from compatibilization by EPC copolymers. (C) 1995 John Wiley & Sons, Inc.

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(PE)(MAH)(DCP),,MAHPE,0.5MAH/100E,PE10MAH(PE-MAH)PE(NBR),,:PE-MAHPE/NBRPE-MAH

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(PE-MA),,PE-MAPE/CaCO_3,CaCO_3,PE-MA,PE-MAPE/CaCO_3/PE-MA510,PE-MA,,

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PEPP,Bragg,,,PP/PE,PPPEPPPP/PE,,,HDPEPP