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Four dithiocarbamates with different chemical structures (S-Propyl N,N-dipropyldithiocarbamate, S-allyl N,N-dipropyldithiocarbamate, S-Propyl N-pyrrolocarbodithioate and S-allyl N-pyrrolocarbodithioate) were used to adjust the melt radical reaction of polypropylene (PP). The combined effects between activating group Z (N,N-dipropyl and N-pyrrolo) and leaving group R(allyl and propyl) in the dithiocarbamates...
The effectiveness of dithiocarbamates in mediating melt radical reaction during preparing long chain branched polypropylene (LCB-PP) was studied. 1 H NMR, FTIR, GPC-TALLS and rheological measurements were used to characterize the structure of the resultant LCB-PP. The results showed that adding dithiocarbamates could help forming more long chain branches on PP, and furthermore the chemical...
High melt strength polypropylene (HMSPP) was prepared by in situ heat induction reaction, in which pure polypropylene (PP) powders without any additives was used as basic resin, and low density polyethylene (LDPE) and trimethylolpropane triacrylate (TMPTA) were added as blending resin and as crosslinking agent, respectively. Microstructure of the obtained HMSPP (PP/LDPE/TMPTA blends) was characterized...
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