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Research on Polymer Rheology and Mixing Processing in Torque-rheometer

Author: ZhaoXinLiang
Tutor: JinGang
School: South China University of Technology
Course: Materials Processing Engineering
Keywords: Torque Torque Rheometer Rheological properties Mixer
CLC: TQ325.3
Type: Master's thesis
Year: 2011
Downloads: 132
Quote: 0
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Abstract

Torque rheometer as an integrated polymer rheology measurement instruments are widely used in the formulation research laboratories and industrial production of a polymer material, whose prominent feature is to be able to close to the real processing conditions of the material in the force and study the behavior under thermal effect, such as the flow characteristics of the polymer composite material or blend, the structural changes in the process, the chemical reaction, degradation of crosslinked and mixed state. For a long time, during the material properties of the torque rheometer Characterization are through research instrument output torque, temperature, and their changes over time relationship to investigate the physical properties of the material, such as to obtain the rheology of the material in the mixer performance, must be supplemented by other means of rheological testing. Materials torque rheometer measurement parameters can be transformed rheological data for direct characterization of material rheological properties can be the case without additional hardware experiment can be done a variety of tests, both to increase the torque rheometer instrument test function, saving manpower and resources. Many researchers for this goal to establish a theoretical model and experimental studies show that under certain conditions, the use of a torque rheometer can measure the rheological parameters of the material. The blend material system, the structural parameters of the rotor, the small study of the impact of material mixed state of measurement precision, especially after the impact of two factors, has not been reported. In this paper, polystyrene (PS), the two pure polymers of polyethylene (PE), polystyrene / polyethylene (PS / PE) polymer blend material, polystyrene / glass beads (PS / GB) filled composite material system for torque rheometer materials absolutely rheological properties to discuss three key parameters: the balance torque equilibrium temperature, rotor equivalent radius. The different materials, different experimental parameters and different mixing the rotor conditions under the balanced torque equilibrium temperature relationship and discuss factors that affect Roller rotor equivalent radius, followed by the use of a torque rheometer measured rheological Data capillary rheometer measurements compared to last through the balance of torque and the degree of mixing to illustrate the relationship of the blend rheological properties and microstructure of the mixing process. The results show that: the equilibrium torque and equilibrium temperature is affected by the type of material, the blend ratio of the content and the structure of the rotor a greater impact, glass bead size has little effect; theory obtained by linear regression using the torque rheometer non-Newtonian index and flow activation energy with the capillary rheometer values ??more consistent; compared to the temperature and the type of material, Roller rotor radius equivalent by the the feeding coefficient and rotor structure greater impact; cavity radius when the equivalent radius of the rotor with the mixing chamber ratio greater than 0.85, the equivalent radius substantially independent of temperature, the influence of the type of material used, and the calculation of the torque rheometer obtained the small difference between the results of rheological parameters and capillary rheometer; balanced torque curve and found mixing uniformity of the material is not necessarily linked, balancing torque and equilibrium temperature selected under the conditions of the study, the corresponding materials have reached a uniformly mixed state.

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