ISSN:0032-3888    

DOI:10.1002/pen.760260102

出版商:Society of Plastics Engineers    

年代:1986

数据来源: WILEY

ISSN:0032-3888    

DOI:10.1002/pen.760260103

出版商:Society of Plastics Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractA systematic study of static and kinetic phase behavior of deuterated polystyrene/poly(vinylmethylether) blends is presented in this paper. The static properties are studied by the small angle neutron scattering techniques and the kinetics of phase decomposition are studied by the temperature jump light scattering; technique. This procedure provides detailed information about phase behavior with regard to both thermodynamics and kinetics.

ISSN:0032-3888    

DOI:10.1002/pen.760260104

出版商:Society of Plastics Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractPolyolefins functionalized with diethylmaleate were mixed with poly(vinylchloride) (PVC) in different compositions. Intermolecular interactions involving the carbonyl groups of the side chains of the functionalized polyolefins and methine hydrogens of PVC were investigated by means of infrared spectroscopy. The major flexibility of the ester groups attached to the backbone chains, with respect to polyesters, seems to increase the capability of such groups to interact with groups of more polar polymers, thus allowing prediction of easier miscibility, which however also depends on the starting polyolefin structure and function‐alization degre

ISSN:0032-3888    

DOI:10.1002/pen.760260105

出版商:Society of Plastics Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractNon‐aqueous dispersions of poly(vinyl acetate) stabilized by a surface layer of poly(2‐ethylhexyl methacrylate) (PEHMA) were prepared. We modified the recipe for particle synthesis, using as a stabilizer a copolymer of EHMA containing a small amount of either phenanthrene (Phe) or pyrene (Py) groups. These fluorescent labels permit us to assess different aspects of stabilizer chain morphology and dynamics. In the particles labeled with Phe groups, the ability of oxygen to quench Phe fluorescence is used as a monitor of O2sorption at the stabilizer‐particle interface. In these experiments, information about the location of the labels and the PEHMA polymer is obtained. In the particles labeled with Py, pyrene self‐quenching and excimer formation serves as a sensor of conformational and mobility changes in the PEHMA polymer upon anchoring in the p

ISSN:0032-3888    

DOI:10.1002/pen.760260106

出版商:Society of Plastics Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractRheological data have been collected both in shear and non‐isothermal elongational flow on three different types of blends, made from one low density polyethylene sample and three linear low density polyethylene samples.In addition to the flow curves, data are presented on the extrudate‐swell phenomenon, on the instability arising in capillary flow and on the tensile behavior in the molten st

ISSN:0032-3888    

DOI:10.1002/pen.760260107

出版商:Society of Plastics Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractCommercial high density polyethylene and polyamide‐6 (PA) resins were melt blended in the Brabender Plasticorder twin‐screw extruder. The blends containing zero to 30 wt percent of polyamide‐6 were examined in dynamic and steady state shear at 150, 200, and 250°C. The Theological test results are discussed in terms of morphology of the samples as observed under scanning electron microscope. Microscopy of the extrudates has shown a temperature dependent movement of the polyamide in the capillary during the extrusion and that fibrillation of the PA phase in the extensional field occurred at all temper

ISSN:0032-3888    

DOI:10.1002/pen.760260108

出版商:Society of Plastics Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractThe phase morphology and polymer chain orientation in polyethylene‐polycarbonte blends is investigated. A blend with a dispersed polyethylene phase was found to exhibit phase growth under quiescent conditions. Addition of a styrene‐(ethylene/butene) block copolymer controls the phase morphology and prevents phase growth. Melt spun tapes and tubular film have been prepared from polyethylene‐polycarbonate blends. Orientation of the crystallo‐graphic axes of the polyethylene and the chain axis of the polycarbonate were determined by infrared dichroism. The addition of polycarbonate to polyethylene is found to decrease chain orientation at the same drawdown

ISSN:0032-3888    

DOI:10.1002/pen.760260109

出版商:Society of Plastics Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractAn analysis is made of the thermodynamic and kinetic factors affecting phase separation in blends of di‐, tri‐ and tetrafunctional epoxy resins, cured with either diamino‐diphenylsulphone (DOS) or with dicyanodiamide (Dicy), and modified with either poly(ethersulphone) (PES) or carboxyl‐terminated butadiene acrylonitrile (CTBN) rubber. The applicability and limitations of the solubility parameter approach in predicting compatibility in reactive blends are con

ISSN:0032-3888    

DOI:10.1002/pen.760260110

出版商:Society of Plastics Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractMorphology and mechanical properties of (amine terminated butadiene acrylonitrile rubber/diglycidyl ether of bis‐phenol‐A epoxy resin) blends of different compositions, cured in wide range of temperatures, are described. Curing at low temperature promoted formation of homogeneous materials with poor fracture resistance. On the contrary, at high temperature tough heterogeneous blends were obtained. Such blends showed phase inversion above 20 percent of rubber. The volume fraction of precipitated phase, determined on SEM micrographs, was higher than the amount of added rubber. A fracture mechanism to account for this is proposed. Extensive voiding and interface damage were observed in the low temperature cured materials. Such phenomena did not contribute to the fracture ene

ISSN:0032-3888    

DOI:10.1002/pen.760260111

出版商:Society of Plastics Engineers    

年代:1986

数据来源: WILEY