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Is a long branched high melt strength polypropylene (LCB-HMSPP) have good melt elasticity and higher melt strength, the microgel content of the PP resin , LCB-HMSPP overcome homopolymerization linear PP strain softening of defects, with the strain hardening extensional rheology characteristics, can be manifested in higher melt strength is stable within a wide temperature range conducive to the process of extrusion foaming and other processing . Article linear PP 1,4 - butanediol diacrylate (BDDA), the small dose 60 < / sup > , the C o -gamma energetic radiation prepared LCB- HMSPP. Shear rheological behavior of The of LCB-HMSPP the the ARES advanced rheological expansion system and capillary rheometer , sag meter research of LCB-HMSPP sag ability using Rheotens extensional rheometer to study the LCB -HMSPP tensile rheological behavior . Sensitizer content , irradiation dose , adding a high molecular weight substance the PP melt viscoelasticity , die swell ratio , anti - sag capacity , shear and tensile effects of the rheological behavior of the proposed PP during irradiation . the mechanism of the formation of the long-chain branched . The study found that the irradiated prepared the LCB-HMSPP melt elasticity significantly enhanced performance in the low frequency end of the storage modulus G ' to improve the internal friction tangent tanδ smaller , zero shear viscosity η 0 increases , The characteristic relaxation time τ 0 variable length . LCB-HMSPP die swell ratio is increased , the melt flow rate is reduced , low gel content , and have good flowability . The irradiation after modification , LCB- HMSPP the sag resistance ability, melt strength and elongational viscosity significantly increased , with a strain hardening extensional rheology characteristics . LCB-HMSPP melt elasticity , die swell ratio , the anti sag ability and elongational viscosity , melt
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