Dynamic mechanical analysis of injection-moulded discs of polypropylene and untreated and silane-treated talc-filled polypropylene composites

Díez‐Gutiérrez, S.; Rodríguez‐Pérez, M. A.; Saja, J.A. de; Velasco, José Ignácio

doi:10.1016/s0032-3861(98)00754-x

Cited by 92 publications

(57 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, to improve the mechanical properties of wood flour-reinforced polymers, various coupling agents and nucleating agents have been used in the last few years, especially those based on anhydride, maleated polypropylene (MAPP), and silane as a coupling agent 2,3 or sodium benzoate as a nucleating agent being the most utilized. 4,5 Furthermore, the final product properties are highly dependent on the rheological conditions during the processing.…”

Section: Introductionmentioning

confidence: 99%

Understanding the viscoelastic properties of extruded polypropylene wood plastic composites

Son

Gardner

O'Neill

et al. 2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

ABSTRACT:The main goal of this study was to analyze the effect of process additives, that is, maleated polypropylene (MAPP), and a nucleating agent on the viscoelastic properties of different types of extruded polypropylene (PP) wood plastic composites manufactured from either a PP homopolymer, a high crystallinity PP, or a PP impact copolymer using dynamic mechanical thermal analysis. The wood plastic composites were manufactured using 60% pine wood flour and 40% PP on a Davis-Standard Woodtruder™. Dynamic mechanical thermal properties, polymer damping peaks (tan ␦), storage modulus (EЈ), and loss modulus (EЉ) were measured using a dynamic mechanical thermal analyzer. To analyze the effect of the frequency on the dynamic mechanical properties of the various composites, DMA tests were performed over a temperature range of Ϫ20 to 100°C, at four different frequencies (1, 5, 10, and 25 Hz) and at a heating rate of 5°C/min. From these results, the activation energy of the various composites was measured using an Arrhenius relationship to investigate the effect of MAPP and the nucleating agent on the measurement of the interphase between the wood and plastic of the extruded PP wood plastic composites.

show abstract

Section: Introductionmentioning

confidence: 99%

Understanding the viscoelastic properties of extruded polypropylene wood plastic composites

Son

Gardner

O'Neill

et al. 2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The nucleation activity parameter (f) defined in Eq. (8) is equal to the ratio of the value of B for the filled polymer to that of the unfilled polymer [9,15].…”

Section: B V K T S N =W Smentioning

confidence: 99%

“…Gutierrez et al [15] and Alonso et al [9] investigated the effect of silane coupling agents on the activity of talc in the polypropylene-talc composites using DSC. They concluded that the f value of the treated filler is closer to zero, so the treated filler is more active than the untreated filler.…”

Section: B V K T S N =W Smentioning

confidence: 99%

“…Particularly, non-isothermal crystallization kinetics of the natural zeolite filled PP composites was investigated to determine the effect of cooling conditions on crystallization properties. The crystallization properties affect mechanical and transport properties of polymer composites [15][16][17]. Because of the importance of crystallization process, non-isothermal crystallization kinetics also was investigated using Avrami and Kissinger models for the determination of spherulite growth rate and crystallization activation energy, respectively.…”

mentioning

confidence: 99%

See 1 more Smart Citation

The effects of natural zeolite and silane coupling agents on melting and crystallization behaviour of polypropylene

Başalp

Tıhmınlıoğlu

2008

J Therm Anal Calorim

View full text Add to dashboard Cite

Polypropylene (PP) is one of the most important commercial polymers due to its superior properties such as high chemical resistance and low density. Fillers (CaCO 3 , Mg(OH) 2 , talc, mica, etc.) or reinforcing agents (glass fibre) are used in many applications of PP such as in household, automotive and packaging industry to enhance the properties of PP (stiffness, gas permeability, heat resistance, flame retardance, etc.), and to reduce the cost. In spite of the advantages of the fillers, the incorporation of the hydrophilic fillers into PP leads to the loss in the mechanical properties and also the changes in the thermal properties of PP. However, the mechanical properties of polymer composites can be improved by using silane coupling agents as those reported in the literature [1][2][3][4][5][6][7].Also, the previous study done by our group on the effects of interfacial interactions on the mechanical properties of PP-natural zeolite composites has indicated that silane coupling agents provide significant improvement in the mechanical properties of the composites [8]. Furthermore, although there are many studies related to the effects of silane coupling agents on the mechanical properties of polymer composites [1][2][3][4][5][6][7][8], the number of studies related to the effects of filler modification on the thermal properties of the composites is limited [9][10][11].Thermal behaviour of polymer composites is important in the determination of end use applications and processing methods of polymer articles. Generally, thermal degradation and crystalline properties of polymer composites can be analyzed by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) [12][13][14]. In this study, it was aimed to investigate the effect of silane coupling agents and natural zeolite on the thermal properties of PP using DSC and TG. Particularly, non-isothermal crystallization kinetics of the natural zeolite filled PP composites was investigated to determine the effect of cooling conditions on crystallization properties. The crystallization properties affect mechanical and transport properties of polymer composites [15][16][17]. Because of the importance of crystallization process, non-isothermal crystallization kinetics also was investigated using Avrami and Kissinger models for the determination of spherulite growth rate and crystallization activation energy, respectively. Theory Characterization of polymer composites by TGTG is based on the mass loss of a sample due to the formation of volatile products as a function of temperature. TG is used to characterize the decomposi- Analysis and Calorimetry, Vol. 94 (2008) 3, 757-765 The thermal characterization of polypropylene (PP) composites containing untreated and treated zeolite with different silane coupling agents was carried out using thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) to investigate the effects of natural zeolite and surface modifiers on melting, crystallization and degradation behaviour of PP. 3-aminopro...

show abstract

“…Some of these research studies have investigated the relationship between the mechanical behavior of polypropylene, microstructure, and processing conditions. Diez-Gutierrez et al [9] have reported the dynamic mechanical analysis of injection-molded discs of polypropylene and untreated and silane-treated talc-filled polypropylene composites. Li and Cheung [10] have investigated the effect of mold temperature on the formation of / polypropylene blends in injection molding.…”

Section: Introductionmentioning

confidence: 99%

Effect of Melt Temperature and Hold Pressure on the Weld-Line Strength of an Injection Molded Talc-Filled Polypropylene

Zhou

Mallick

2014

Journal of Composites

View full text Add to dashboard Cite

Tensile stress-strain behavior coupled with fractography was used to investigate the weld-line strength of an injection molded 40 w% talc-filled polypropylene. The relationship between processing conditions, microstructure, and tensile strength was established. Fracture surface of the weld line exhibited skin-core morphology with different degrees of talc particle orientations in the core and in the skin. Experimental results also showed that the thickness of the core decreased and the thickness of the skins increased with increasing melt temperature and increasing hold pressure, which resulted in an increase of yield strength and yield strain with increasing melt temperature and increasing hold pressure. Finally, a three-parameter nonlinear constitutive model was developed to describe the strain softening behavior of the weld-line strength of talc-filled polypropylene. The parameters in this model are the modulus E, the strain exponent m, and the compliance factor . The simulated stress-strain curves from the model are in good agreement with the test data, and both m and are functions of skin-core thickness ratio.

show abstract

Dynamic mechanical analysis of injection-moulded discs of polypropylene and untreated and silane-treated talc-filled polypropylene composites

Cited by 92 publications

References 21 publications

Understanding the viscoelastic properties of extruded polypropylene wood plastic composites

Understanding the viscoelastic properties of extruded polypropylene wood plastic composites

The effects of natural zeolite and silane coupling agents on melting and crystallization behaviour of polypropylene

Effect of Melt Temperature and Hold Pressure on the Weld-Line Strength of an Injection Molded Talc-Filled Polypropylene

Contact Info

Product

Resources

About