Review on the production process and uses of controlled rheology polypropylene—Gamma radiation versus electron beam processing

Lugão, Ademar B.; Otaguro, Harumi; Parra, D.F.; Yoshiga, Adriana; Lima, L.F.C.P.; Artel, B.W.H.; Liberman, Susana Alcira

doi:10.1016/j.radphyschem.2007.01.015

Cited by 30 publications

(16 citation statements)

References 4 publications

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“…Free radicals located at the high-mobility amorphous or liquid regions will react relatively fast, mainly by reaction with other radicals, with antioxidants, with oxygen or with other macromolecules. Some free radicals are located in the crystalline phase, and will react at a much slower rate [4,10].…”

Section: Introductionmentioning

confidence: 99%

SSA study of early polyethylenes degradation stages. Effects of attack rate, of average branch length, and of backbone polymethylene sequences length distributions

Pérez

Failla

Carella

2013

Polymer Degradation and Stability

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Section: Introductionmentioning

confidence: 99%

SSA study of early polyethylenes degradation stages. Effects of attack rate, of average branch length, and of backbone polymethylene sequences length distributions

Pérez

Failla

Carella

2013

Polymer Degradation and Stability

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“…In spite of the large market of polypropylene, poor rheological properties, such as lack of melt strength, limit its processing in certain applications. Thus, by modifying the rheology and enhancing strain hardening of the PP melt, PP can be processed via different methods, such as foaming, thermoforming, extrusion coating and blow molding . The high melt strength of a polymer is either due to long chain branching (LCB) or high molecular weight .…”

Section: Introductionmentioning

confidence: 99%

An Overview of the Potential of UV Modification of Polypropylene

Amintowlieh

Tzoganakis

Penlidis

2016

Macromolecular Symposia

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Summary: UV radiation with a photoinitiator has been utilized to modify polypropylene (PP). Factors affecting solid state photomodification were studied and the optimal processing conditions for formation of three different structures (degraded, long chain branched and crosslinked) in PP were determined. A long radiation time (more than 5 minutes) is required to form long chain branched PP (LCBPP) and this exposure time is even higher for production of crosslinked PP (XPP). Trimethylolpropane triacrylate (TMPTA) was utilized to decrease UV radiation duration. Optimal concentrations of TMPTA and photoinitiator for formation of long chain branched and crosslinked PP were determined. Finally, a setup was suggested for continuous photomodification of PP using a twin screw extruder. In this design, PP strands are irradiated directly after the die. Optimal photoinitiator (benzophenone) concentration, coagent (TMPTA) concentration and radiation time required to form controlled rheology (CRPP) or long chain branched PP or crosslinked PP were identified.

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“…Grafting of long-chain-branches on PP backbone using acetylene as a crosslink promoter was developed for production of branched PP under gamma radiation process and was reported (Lugao et al, 2007;Oliani et al, 2012).…”

Section: Introductionmentioning

confidence: 99%