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Polypropylene High-melt strength

A comparison is made between a 3.5 melt flow conventional polypropylene homopolymer (Profax 6523) and a 7.0 melt flow, high-melt-strength, foamable PP homopolymer in extensional flow. The importance of extensional or elongational viscosity in the foam process is demonstrated and the way in which the rheological differences permit the production of low-density foam on tandem extrusion equipment is shown. 6 refs. [Pg.108]

AFM Imaging of Processed Polymers (1) Blown Films of High Melt Strength Polypropylene (hmsPP)... [Pg.165]

Fig. 3.74 Intermittent contact mode AFM phase images obtained with an amplitude setpoint ratio of 0.5 on (a) compression molded high melt strength polypropylene and microtomed sections of hmsPP blown film in the (b) machine direction (MD), and (c) the transverse direction (TD). Reproduced with permission from [152]. Copyright 2002. Elsevier... Fig. 3.74 Intermittent contact mode AFM phase images obtained with an amplitude setpoint ratio of 0.5 on (a) compression molded high melt strength polypropylene and microtomed sections of hmsPP blown film in the (b) machine direction (MD), and (c) the transverse direction (TD). Reproduced with permission from [152]. Copyright 2002. Elsevier...
Ultra-high molecular weight polypropylene (UHMW-PP, Mn about 5,000,000) is used in applications where a high melt strength is necessary. The dynamic stiffness i.e. the storage shear modulus (G ), is related with the melt strength and can thus be used to compare the properties in the melt of different UHMW-PP systems. A number of experimental UHMW-pp systems was investigated in this way. [Pg.350]

Automotive seat back substrates are among large bow-molded parts made from very-low-melt-flow, high-melt-strength PP. Automotive is a major polypropylene market. The ease of recycling of PP is an important consideration in automotive applications. [Pg.771]

From the three basic categories of polypropylene, namely, homopolymers, heterophasic copolymers, and random copolymers (with ethylene), there are specialty resins with enhanced capabilities for specific applications. Producers of large blow-molded or thermoformed parts can thus utilize grades with high melt strength to fabricate heat-resistant under-the-hood automotive parts. [Pg.772]

Branched Polypropylene. This is added to regular polypropylene to produce high melt strength for blow molding and foam production. [Pg.352]

Yoshii, R, Makuuchi, K., Kikukawa, S., Tanaka, T., Saitoh, J., Koyama, K. High-melt-strength polypropylene with electron beam irradiation in the presence of polyfunctional monomers./. Appl Polym. Sci. (1996) 60, pp. 617-623... [Pg.89]

He, C., Costeux, S., Wood-Adams, R, Dealy, J. M. Molecular structure of high-melt-strength polypropylene and its application to polymer design. Polymer (2003) 44, pp. 7181-7188... [Pg.89]

Level and type of high melt strength polypropylene... [Pg.789]

EFFECT OF DIE GEOMETRY ON FOAMING BEHAVIORS OF HIGH MELT STRENGTH POLYPROPYLENE WITH CO2... [Pg.1059]

High melt strength. Polypropylene, blowing foaming, pressure drop rate, premature cell growth... [Pg.1062]

See other pages where Polypropylene High-melt strength is mentioned: [Pg.418]    [Pg.421]    [Pg.44]    [Pg.53]    [Pg.65]    [Pg.91]    [Pg.76]    [Pg.1756]    [Pg.374]    [Pg.100]    [Pg.617]    [Pg.80]    [Pg.1059]    [Pg.2662]    [Pg.418]    [Pg.532]    [Pg.162]    [Pg.303]    [Pg.312]    [Pg.52]    [Pg.36]    [Pg.658]    [Pg.42]    [Pg.1077]    [Pg.38]    [Pg.48]    [Pg.887]    [Pg.1035]    [Pg.1041]    [Pg.189]    [Pg.394]    [Pg.268]    [Pg.903]   
See also in sourсe #XX -- [ Pg.80 ]



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