Melt rheological properties of polypropylene–wood flour composites

Maiti, Sukumar; Hassan, Mohd Roshdi

doi:10.1002/app.1989.070370721

Cited by 76 publications

(101 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The plots are linear in the shear rate range studied (40 -6000 s Ϫ1 ), which implies that the melts obeyed power law behavior like other filled i-PP systems. 4,21,22 The flow curve moved downward compared with i-PP content until F reached 8.5% in both systems. Thus, the system showed lower shear stress at low contents of CaSiO 3 , up to 8.5 vol %, and at a constant shear rate.…”

Section: Shear Stress-shear Rate Curvesmentioning

confidence: 96%

Rheological properties of calcium silicate‐filled isotactic polypropylene

Maiti

Singh

Ibrahim

2002

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

ABSTRACT:The melt rheological behavior of calcium silicate-filled isotactic polypropylene, with filler volume contents of 0 -17.8%, was determined at 493 K. The composites followed the power law in shear stress versus shear rate variations and were shear thinning. Initially, apparent melt viscosity decreased until a critical filler volume content of 8.5% was reached. However, on further increase in calcium silicate concentration, apparent melt viscosity increased. Melt elasticity also showed an initial decrease until 8.5% filler content was reached and then an increase beyond this filler content. Surface treatment of calcium silicate with a titanate coupling agent, LICA 38, modified the rheological properties because of the plasticizing/lubricating effect of LICA 38.

show abstract

Section: Shear Stress-shear Rate Curvesmentioning

confidence: 96%

Rheological properties of calcium silicate‐filled isotactic polypropylene

Maiti

Singh

Ibrahim

2002

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Both capillary and oscillatory rheometers have been reported to generate rheological data for WPC. Because of migration (from wall to center) and breaking of wood fibers at high shear rates in capillary rheometer, using of dynamic oscillatory technique is recommended [11,12]. Maiti et al [13] studied the effect of wood flour (WF) concentration on the rheological behavior of isotactic-polypropylene (i-PP)/wood composite in capillary rheometer.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Comparison of Rheological Properties of Agro Fiber Filled High-Density Polyethylene Bio-Composites

Ogah¹,

Afiukwa²,

Nduji³

2014

OJPChem

View full text Add to dashboard Cite

The rheological behavior of composites made with high-density polyethylene (HDPE) and different agro fiber by-products such as corncob (CCF), Rice hull (RHF), Flax shives (FSF) and Walnut shell (WSF) flour of 60 -100 mesh were studied. The experimental results were obtained from samples containing 65 vol.% agro fiber and 3 wt.% lubricant. Particle sizes distribution of the agro fibers was in the range of 0.295 mm to ˂0.125 mm. SEM showed evidence of complete matrix/fiber impregnation or wetting. The melt rheological data in terms of complex viscosity (η*), storage modulus (G'), loss modulus (G"), and loss tangent (tanδ) were evaluated and compared for different samples. Due to higher probability of agglomeration formation in the samples containing 65 vol.% of agro fillers, the storage modulus, loss modulus and complex viscosity of these samples were high. The unique change in all the samples is due to the particle size distribution of the agro fibers. The storage and loss modulus increased with increasing shear rates for all the composites, except for Walnut shell composite which exhibited unusual decrease in storage modulus with increasing shear rate. Damping factor (tanδ) decreased with increasing shear rate for all the composites at 65 vol.% filler load although there were differences among the composites. Maximum torque tended to increase at the 65 vol.% agro fiber load for all composites. Corncob and Walnut shell composites gave higher torque and steady state torque values in comparison with Flax shives and Rice hull composites due to differences in particle sizes distribution of the agro fibers.

show abstract

“…An extensive body of research has been conducted on the effect that WF size has on WPC properties (Liew et al 2000, Stark and Berger 1997ab, Stark and Rowlands 2003, Zaini et al 1995, Maiti and Hassan 1989, Li and Wolcott 2005, Marcovich et al 2004, Lee et al 2001. Several studies have specifically examined the effect of WF size on mechanical properties (Liew et al 2000, Stark and Berger 1997ab, Stark and Rowlands 2003, Zaini et al 1995, Lee et al 2001.…”

Section: Introductionmentioning

confidence: 99%

“…However, little is understood on the effect of WF size on processability, such as rheological characteristics and a limited number of articles have investigated before 2000 (Maiti and Hassan 1989). Shenoy (1999) provides an extensive review that examines the rheology of fillers in polymer melts.…”

Section: Introductionmentioning

confidence: 99%

The effect of micron sized wood fibers in wood plastic composites

Gallagher

McDonald

2013

Maderas, Cienc. tecnol.

View full text Add to dashboard Cite

The popularity and demand for wood plastic composites (WPC) has focused research on fiber properties associated with performance. In this study, maple wood fibers (WF) were ball milled and classified into discrete size fractions. Fiber analyses showed only three distinct WF size classes (80-100, 100-200 and <200 mesh). High density polyethylene (HDPE) based WPC were made from classified WF (10 to 50%). The effect of WF size, loading, and maleated polyethylene (MAPE) coupling agent on WPC rheological behavior (torque rheometry and melt flow rate (MFR)) and flexural properties were examined. The WPC MFR decreased with wood loading, increased with a reduction in WF size. The modulus of rupture (MOR) was shown to increase with a reduction in WF size and increase with the addition of MAPE. The increase in MOR is likely due to an increase in the interfacial interaction between the polymer and WF. Modulus of elasticity (MOE) was shown to increase with an increase in wood loading and decrease with a decrease in WF size. The toughness of the WPC was shown to increase with a decrease in WF size and increase upon addition of MAPE.

show abstract

Melt rheological properties of polypropylene–wood flour composites

Cited by 76 publications

References 17 publications

Rheological properties of calcium silicate‐filled isotactic polypropylene

Rheological properties of calcium silicate‐filled isotactic polypropylene

Characterization and Comparison of Rheological Properties of Agro Fiber Filled High-Density Polyethylene Bio-Composites

The effect of micron sized wood fibers in wood plastic composites

Contact Info

Product

Resources

About