Abstract
The nanoparticles small enough can significantly altered segmental dynamic and chain relaxation of polymer. The viscoelastic properties of ultrahigh molecular weight polyethylene (UHMWPE) blended with polyhedral oligomeric silsesquioxanes (POSS) was investigated in detail. A reduced viscosity of UHWMPE/Octamethyl- POSS was observed. The mechanism of viscosity reduction was studied from the view of disentanglement effect. Dynamic mechanical analysis (DMA) indicated that the pseudoequilibrium modulus (GN0) of UHMWPE/POSS (100/0.5) blend in the rubbery plateau was much lower than that of UHMWPE. Accordingly, the calculated entanglement density (Me) of UHMWPE/POSS blend was smaller than that of pure UHMWPE. Further reduction in glass transition temperature (Tg) was observed by the differential scanning calorimeter (DSC). Additionally, isothermal annealing was conducted on UHWMPE using differential fast scanning chip calorimetry (Flash-DSC) firstly. Two melting peaks of the sample were observed after isothermal melt-crystallization and the data were analyzed using the modified Arrhenius equation. The sample UHWMPE/POSS showed a lower melting active energy than pure UHWMPE, indicating the entanglement level of UHMWPE decreased and chain segment activity improved with addition of a small amount of POSS.
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