WebJul 1, 2000 · A novel strategy was developed by melt grafting reaction in the presence of macromonomer vinyl polydimethylsiloxane (VS) and comonomer styrene (St) for … WebStructural characterization of alpha methyl styrene-butyl acrylate-grafted polyetheretherketone films
GRAFT COPOLYMERS OF POLYPROPYLENE FILMS. 1. …
WebCONCLUSIONS (1) The graft polymerization of styrene on to highly orientated polypropylene fibres, initiated by free radicals produced by preliminary irradiation from a … WebOct 15, 2002 · The RAFT graft polymerization is compared with the conventional free-radical graft polymerization of styrene onto polypropylene. Both processes show two distinct regimes of grafting: (1) the grafting layer regime, in which the surface is not yet totally covered with polymer chains, and (2) a regime in which a second polymer layer is … city grants program
Surface grafting onto polypropylene — a survey of recent …
WebGraft copolymerization: Strips of polypropylene films (PP) of known weight were immersed in different grafting solutions in glass quick-fit tubes. The grafting solutions were composed of mixtures of acrylic acid (AAc) and styrene (S) monomers at different ratios that dissolved in different solvent compositions of methanol and water. Mohr's salt The thermal hemolytic scission of the C–O bond of the aminoxy moiety of the PP-TEMPO takes place at 125 °C and causes the radical polymerization of styrene to yield the graft PP-g-PSt copolymer according to Scheme 6. The bond dissociation is considered to be reversible. The crude polymerization product was … See more Differential scanning calorimetric heating thermograms of iPP and iPP-g-MAH are shown in Fig. 1 that the melting temperature (T m) of iPP (164 °C) was slightly higher than those of iPP-g-MAH (163 °C). The heat of … See more The MAH-g-iPP sample was extracted for 3 h with acetone in a Soxhlet extraction apparatus, filtrated and dried for 24 h in vacuum. The extent of grafting was calculated by the … See more The synthetic route of PP macroinitiator is shown in Schemes 1, 2, 3, 4, 5. In the first step, the succinic anhydride (SA) group grafted in iPP-g-MAH reacted with excess ethanolamine to give … See more The FTlR spectra of iPP (a) and iPP-g-MAH (b) are shown in Fig. 2. In the iPP-g-MAH spectrum (b), a strong characteristic peak is revealed at 1,732 cm−l that indicated the … See more did ancient egyptian invent toothpaste