P4VPPoly(4-Vinyl Pyridine)
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From our earlier experience [27, 28] we know that P4VP has the ability to complex with metal/metal oxide nanoparticles and the same could be expected from P4VP grafted on the surface of PTFE.
P4VP was separated by evaporation of ethanol under reduced pressure, and weighed.
PTFE shows a clean single degradation peak at 569[degrees]C (T III), whereas the complexes show a multidegradation pattern which shows three steps for P4VP complex, surfactant, and PTFE.
A shift in the transition temperature to lower temperatures by 3-10[degrees]C was noticed for the composites which could be because of the plasticization effect of P4VP complexes.
The composites have shown a multistep degradation pattern that may be attributed to the P4VP, surfactant, and PTFE backbone degradation.
Two diblock copolymers of PS and P4VP were synthesized by anionic sequential polymerization.
The results indicate that two blocks of PS with degrees of polymerization 406 and 450 were obtained, and subsequently P4VP blocks of 546 and 47 repeat units were attached to these PS blocks, respectively.
To increase the amphiphilic character of PS-b-P4VP copolymers, a formal charge has been introduced into the P4VP block by reaction of pyridine ring with ethyl bromide.
LDPE-P4VP modified materials showed two broad transitions, with [T.sub.g] values at 34.5-36.5[degrees]C and 74.0[degrees]-75.8[degrees]C, inward shifted from the [T.sub.g] of pure P4VP. A third [T.sub.g], not always possible to be determine, can be assigned to -70.0[degrees]C to -75.0[degrees]C, near that ascribed to pure LDPE.
The micrographs of the modified LDPE-P4VP containing 16.2, 34.5, and 60.8% of P4VP in the matrix showed fibrils and a delamination surface.
The in situ thermal polymerization of 4VP in LDPE is observed to occur in the amorphous PE domains, except where a decrease for the crystallinity degree from 56.6%(1.6% of P4VP in LDPE) to 36.2%(168.0% P4VP in LDPE) occurred.