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One of the reasons for the good acceptance of the commercial PP is the fact that market requires products with features of "engineering plastics" with prices in the range of commodities. High melt strength polypropylene (HMSPP) grades are produced by radiation process and have improved rheology for melt blow processes. The melt strength (MS) proper...
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Citations
... In the past few years different companies have made a lot of effort to evaluate the possibilities and potentials of polypropylene s post reactor modification [10]. Recently, various grades of long chain branched PP (lcb PP) have been presented to the market [11]. The effect of molecular size, molecular weight distribution and long chain branched PP on melt strength and extensional behaviour is quite different. ...
Melt strength of polymer is one of the main primaries for the success of fabricating low-density extrusion foam and thermoforming process. Polypropylene (PP) as a linear polyolefin has low melt strength for bubble stabilization and sagging. Large molecules and long chain branches of PP cause higher molecular entanglements and increase elongational strength of PP melt. In this paper the rheological behaviour, melt elasticity, mechanical properties, and crystallinity of linear PP blends are studied and compared with blends containing a long chain branched PP resins. It is found that ternary blends of linear PP improve the melt elasticity in a certain composition, comparing to binary blends. Branched PP resins increase molecular entanglements, which it leads to higher melt elasticity. The results of this study help to understand the effects of chain size and chain architecture in increasing the melt strength and melt drawability of PP blends. These are the most important factors for producing low density PP foam and high quality thermoformed products.
