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Continuous modification of polypropylene via photoinitiation
Author(s) -
Amintowlieh Yasaman,
Tzoganakis Costas,
Penlidis Alexander
Publication year - 2015
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.24133
Subject(s) - tmpta , photoinitiator , materials science , plastics extrusion , polypropylene , rheology , factorial experiment , reactive extrusion , composite material , trimethylolpropane , branching (polymer chemistry) , polymer chemistry , polymer , monomer , computer science , machine learning , polyurethane
A twin screw extruder was used for continuous modification of polypropylene (PP) via UV radiation. Long chain branches (LCBs) were incorporated in the PP backbone to modify its rheological properties. Benzophenones (BPH) as photoinitiator and trimethylolpropane triacrylate (TMPTA) as coagent were utilized during PP photomodification. Radiation was carried out after mixing in the extruder on solid stretched strands with ∼0.3 mm thickness. The effects of photoinitiator concentration, radiation time, and coagent presence were studied via a replicated two‐level full factorial design of experiments. It was shown that photomodification of PP can be done continuously. Formation of LCBs in the experimental runs was confirmed via rheological measurements. Gel content of the samples was also measured. It was found that LCBs can be formed in PP with and without TMPTA at certain processing conditions. The amount of gel in the samples prepared with TMPTA was higher; however, the gel content could be controlled by manipulating BPH concentration and radiation time. POLYM. ENG. SCI., 55:2423–2432, 2015. © 2015 Society of Plastics Engineers