Experimental Estimation of Relaxation Behavior for Hemp Fiber Reinforced Polypropylene Composite with Torque Rheometer

Jiang, Taijun; Zeng, Guangsheng; Hu, Can

doi:10.1007/s13233-020-8059-3

Cited by 6 publications

(13 citation statements)

References 21 publications

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“…The size of the active space of each moving unit of the polymer molecular chain is the free volume V, and its size is mainly determined by the temperature and the condensed state of the polymer itself. 29 Therefore, as the temperature increases, the free volume V increases first, and then gradually reaches a stable value V m that does not change under the limiting condition of the polymer condensed state. 5…”

Section: Relaxation Mechanismmentioning

confidence: 97%

“…First, in order to eliminate the influence of the presence of moisture on the test results, the material was dried at 100 C for 3 h by using a vacuum drying oven, and sealed to keep dry by using sealed bags. 29 Second, the relaxation time of the dried polystyrene samples was measured by using a measurement method of torque rheometer for the needs of practical applications. The experimental rotation speed was set as 40 r\min, and the temperature points were set as 155 C, 160 C, 165 C, 170 C, and 175 C for experiment.…”

Section: Experimental Stepsmentioning

confidence: 99%

“…The experimental rotation speed was set as 40 r\min, and the temperature points were set as 155°C, 160°C, 165°C, 170°C, and 175°C for experiment. Each group of experimental materials was 48 g, the experiment time was 10 min, and five repeated experiments at each temperature point were performed to reduce experimental errors 29 . Third, based on the experimental principle, the relaxation time of polystyrene at different temperatures was measured, and the relationship between the relaxation time and temperature was obtained.…”

Section: Experimental Studymentioning

confidence: 99%

See 2 more Smart Citations

The investigation of relaxation mechanism and model of polystyrene in high‐elastic state

Zeng

Sun

Huang

et al. 2020

J of Applied Polymer Sci

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The relaxation behavior of polymer in its high elastic state is a key factor which determines the molding process and accuracy of its products. Polystyrene with different molecular weights are selected as research object and its relaxation time at different temperatures was tested by torque rheometer. Combining the relationship of "temperature-relaxation time", to deeply analyze its relaxation mechanism, a physical model of high elastic relaxation time of polystyrene based on the movement of molecular chains was established, and the change of the physical model at different temperatures was explained. The corresponding mathematical model was obtained by analyzing the influence of the weight average molecular weight M w , dispersion D, and temperature T parameters of polystyrene on its relaxation time. The results of experiments and model calculations reveal that the relaxation time of polystyrene under high elasticity does not continue to decrease with the increase of temperature, but it changes in an M-shape with the increase of temperature, that is, the relaxation time shows an upward trend at 155 C-160 C and a downward trend at 160 C-165 C. It has an increasing trend at 165 C-170 C, and a decreasing trend at 170 C-175 C. Polystyrenes with different molecular weights and dispersion degrees have different M forms. The research results have theoretical guiding significance for polymer processing.

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Section: Relaxation Mechanismmentioning

confidence: 97%

Section: Experimental Stepsmentioning

confidence: 99%

Section: Experimental Studymentioning

confidence: 99%

See 1 more Smart Citation

The investigation of relaxation mechanism and model of polystyrene in high‐elastic state

Zeng

Sun

Huang

et al. 2020

J of Applied Polymer Sci

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“…6 It can be widely used in packaging, household, automotive, construction, agriculture and other industries. 7–10 Some studies have shown that sisal fiber can be added into polymer matrix as reinforcement to obtain better performance. 11 Vimalanathan et al.…”

Section: Introductionmentioning

confidence: 99%

“…6 It can be widely used in packaging, household, automotive, construction, agriculture and other industries. [7][8][9][10] Some studies have shown that sisal fiber can be added into polymer matrix as reinforcement to obtain better performance. 11 Vimalanathan et al 12 had studied the reinforcing effect of sisal fiber in the polyester matrix, and the results showed that the composite reinforced by fibers with the length of 20 mm and volume fraction of 20% produced the best mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of fiber modified by alkali/polyvinyl alcohol coating treatment on properties of sisal fiber plastic composites

Zhou

Zhang

et al. 2020

Journal of Reinforced Plastics and Composites

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Demand for natural fibers reinforced composites is growing as an alternative to synthetic fiber reinforced plastic composites. However, poor compatibility between natural fiber and matrix has limited its development. Therefore, it is necessary to improve their interfacial adhesion to improve the comprehensive properties of composites. In this work, sisal fibers were subjected to an alkali/polyvinyl alcohol coating treatment by an ultrasonic impregnation method, and the sisal/high-density polyethylene composite was prepared by a twin-screw extruder. The Fourier transform infrared spectroscopy was used to characterize the modification effect of sisal fiber. The surface morphology of sisal fiber and the interfacial morphology of sisal/high-density polyethylene composites were observed. The mechanical properties and water absorption of sisal/ high-density polyethylene composites were also studied. The results show that alkali/polyvinyl alcohol coating compound treatment can effectively improve the interfacial adhesion between sisal fiber and high-density polyethylene, improve the mechanical properties of composite, and reduce water absorption. Alkali/polyvinyl alcohol coating compound treatment is a very environment-friendly, cost-effective fiber modification method when compared with traditional modification methods. It is helpful for the development and application of natural fibers reinforced composites.

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Effect of compression parameters on stress relaxation behavior of bamboo fiber reinforced polypropylene composites

Jiang

Zeng

2022

Polymer Composites

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A self‐made thermal mechanical analyzer was manufactured to characterized the compression and bending stress relaxation behavior for bamboo fiber reinforced polypropylene composite with different bamboo fiber and coupling agent concentration. The effects of bamboo fiber concentration, interfacial strength, load controlling method, compression speed, and temperature on composite stress relaxation parameters were investigated. The obtained results show that two‐stage relaxation process could be observed for both compression and bending test while shearing relaxation process was a single exponential decay. The relaxation time for slow exponential relaxation process was two orders of magnitude to that for fast relaxation process and the force decay amplitude on the first linear stage was about 3.5 times as much as that on the second exponential decay stage. Both the filling of bamboo fiber and coupling agent could increase the stress relaxation time but higher temperature would promote the movement of polymer chains and lengthen the stress relaxation time. The insights obtained from the experiments and fitting results can offer valuable reference to precisely controlling of dimensional accuracy and production efficiency for the composite products of irregular structure.

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Experimental Estimation of Relaxation Behavior for Hemp Fiber Reinforced Polypropylene Composite with Torque Rheometer

Cited by 6 publications

References 21 publications

The investigation of relaxation mechanism and model of polystyrene in high‐elastic state

The investigation of relaxation mechanism and model of polystyrene in high‐elastic state

Effect of fiber modified by alkali/polyvinyl alcohol coating treatment on properties of sisal fiber plastic composites

Effect of compression parameters on stress relaxation behavior of bamboo fiber reinforced polypropylene composites

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