Mechanical Properties of Isotactic Polypropylene Modified with Thermoplastic Potato Starch

Knitter, Monika; Dobrzyńska‐Mizera, Monika

doi:10.1007/s11029-015-9496-5

Cited by 16 publications

(11 citation statements)

References 13 publications

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“…However, TPS has some major drawbacks such as poor mechanical properties and hydrophilicity. In order to overcome these drawbacks, TPS was blended with synthetic polymers such as PE, polypropylene (PP), and PS which are highly hydrophobic and have superior mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Biodegradable polypropylene/thermoplastic starch nanocomposites incorporating halloysite nanotubes

Raee

Kaffashi

2017

J of Applied Polymer Sci

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In this work, polypropylene/thermoplastic starch (PP/TPS) with and without halloysite nanotubes (HNTs) was prepared via melt mixing in order to obtain environmentally friendly plastics. PP-grafted maleic anhydride (PP-g-MA) was used to improve the compatibility among the highly incompatible polymers. The mechanical characterization showed a reduction in the tensile properties of the polymer when TPS increased; however, HNT successfully compensated for some of the observed losses. The results from the thermogravimetric analysis (TGA) indicated that HNT is an efficient reinforcement for the thermal stability improvement. TPS caused an increase in the storage modulus (G 0 ) and the complex viscosity (h*) which marks a change in the viscoelastic properties of the system. The scanning electron microscope (SEM) images showed the effective plasticization of starch and better dispersion of TPS in the presence of HNT. Some samples were also buried in the soil to measure their sustainability after their lifetime lapse. The results indicated that TPS improves the biodegradability of the PP/TPS system. PP considerably lowered the moisture uptake of TPS; nevertheless, HNT caused a slight increase in the moisture absorption.

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Section: Introductionmentioning

confidence: 99%

Biodegradable polypropylene/thermoplastic starch nanocomposites incorporating halloysite nanotubes

Raee

Kaffashi

2017

J of Applied Polymer Sci

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“…The measurement system recorded the response of the belts to forced oscillations in the form of the shear storage modulus G ′, the shear loss modulus G ″, the loss angle δ , and the value of the current temperature T where the sample is located. These DMTA tests were performed with the following assumptions [ 48 , 52 , 53 ]: Temperature range from −100 to +180 °C recorded in continuous mode, Rate of temperature change

= +5 °C/min during heating and

= −5 °C/min during cooling, Oscillation amplitude A = 0.02%, Oscillation frequency f = 1 Hz. …”

Section: Methodsmentioning

confidence: 99%

Comparative Analysis of Polyurethane Drive Belts with Different Cross-Section Using Thermomechanical Tests for Modeling the Hot Plate Welding Process

et al. 2021

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The paper presents a comparative analysis of the circular and flat cross-section belts using measurements of a set of thermomechanical parameters, contributing to research about hot plate welding of drive belts. On the basis of thermogravimetric and spectrophotometric tests, information about the same chemical composition of the two belts was obtained. Dynamic thermomechanical analysis and scanning differential calorimetry provided information about a small difference between belts, which disappeared when the material was placed in a state of increased temperature and mechanical stress. On the basis of the analysis of the specific heat, thermal diffusion, density, and hardness, the values of the selected thermal properties of the belt were obtained, and a large similarity between the belts was identified. On the basis of the novel performed test cycle, it has been hypothesized that circular and flat belts made from thermoplastic polyurethane elastomer could be used interchangeably for butt-welding testing. It has also been proven that cyclic thermomechanical loads unify the properties of both materials so that multiple mechanical and thermal loads do not result in any change in the material properties of the two belts. As a consequence, changes in the weld properties after welding, compared to a solid belt, are not expected.

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“…The DMTA methodology was used for the verification of thermomechanical properties of the material, especially for glass transition temperature. Another example of using the DMTA test for the evaluation of polymeric properties was conducted for modified thermoplastic material [67] when damping factor from DMTA test was used for evaluation of the changes obtained by modification. Test results, especially components connected with a modulus of elasticity G and damping factor δ allows designating the dynamic viscosity [65].…”

Section: Determination Of Dynamic Viscosity Of the Belt Materialsmentioning

confidence: 99%

Experimental approach to modeling of the plasticizing operation in the hot plate welding process

Wałęsa

Talaśka

Wilczyński

et al. 2021

Archiv.Civ.Mech.Eng

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The paper discusses the topic of butt welding of polyurethane drive belts by the hot plate method in the context of modeling the process of this technological operation. Based on the analysis of the butt welding process, a series of studies of the thermomechanical properties of the material from which the belt is made has been planned. The results will be used for mathematical modeling of the welding process, and in particular its most important phase: the plasticizing operation. On this basis, the study of the compression of cylindrical specimens taken from the belt has been performed at two different speeds. Their result is the relationship between the compressive stress σc and the modulus of longitudinal elasticity Ec at compression and: deformation εc, temperature value T, as well as the compressive velocity vc. In the next step, dynamic viscosity η of the belt material was determined based on the results of dynamic thermomechanical analysis. The research work culminated in the attempts to plasticize the material on a hot plate, in conditions similar to the process of industrial welding. These studies were performed at different speeds vpl, resulting in the correlation between the force required for plasticizing Fpl and the value of the speed of the belt end vpl relative to the hot plate heated to a temperature Tp. The obtained results will be used to formulate a mathematical model of plasticizing the material, based on the selected mechanical deformation models.

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Mechanical Properties of Isotactic Polypropylene Modified with Thermoplastic Potato Starch

Cited by 16 publications

References 13 publications

Biodegradable polypropylene/thermoplastic starch nanocomposites incorporating halloysite nanotubes

Biodegradable polypropylene/thermoplastic starch nanocomposites incorporating halloysite nanotubes

Comparative Analysis of Polyurethane Drive Belts with Different Cross-Section Using Thermomechanical Tests for Modeling the Hot Plate Welding Process

Experimental approach to modeling of the plasticizing operation in the hot plate welding process

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