Modification of the Properties of Polyvinylbutyral with Highly Dispersed Fillers

Mukha, Yu. B.; Kolupaev, B. S.; Levchuk, V. V.; Mukha, B.I.

doi:10.1177/0307174x0102800106

International Polymer Science and Technology

2001

DOI: 10.1177/0307174x0102800106

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Modification of the Properties of Polyvinylbutyral with Highly Dispersed Fillers

Yu. B. Mukha¹,

B. S. Kolupaev²,

V. V. Levchuk³

et al.

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“…The minimum of the coefficient Ap/Ap in the pressure range of 10-200 MPa for the PVC + 5 wt.% Fe system is associated with the most complete realization of adhesion-adsorption bonds at the interface in the low-filling region [6], with induction of the directive action of the filler on the polymer far into the depth of the binder as a result of the intermolecular interaction, and with a decrease in the internal pressure of the system [2][3][4]8].…”

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confidence: 97%

“…The density (p) of the PVC systems was studied using the method of hydrostatic weighing [5], and the hardness (Hv) was studied, using the Vickers method, on a PMT-3 microhardness meter with loading for a time of 2 min [6]. With a confidence coefficient of 0.95, the mean relative measurement error for p and Hv, respectively, was 0.2 and 1.3%.…”

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confidence: 99%

“…The subsequent decrease in the density of the PVC compositions for p > 200 MPa is linked with mechanodestructive phenomena, since, at the metal-polymer-metal interface in the composition, large mechanical stresses and, correspondingly, high temperatures may 143 158 140 147 147 141 154 139 144 154 155 159 150 151 155 157 161 155 174 develop [6,7]. Here, the energy of the thermal motion of the kinetic elements of the PVC structure can be higher than the energy of their chemical bond, which causes a decrease in the molecular weight of the macromolecules and, ultimately, a change in the properties of the polymer system [1][2][3].…”

mentioning

confidence: 99%

“…This is caused by the fact that within the limits of pressures p < 120 MPa, structural ordering takes place in the volume of the polymer matrix. With a subsequent rise in the compacting pressure (200-300 MPa), structural ordering of the PVC is realized at the polymer-highly disperse filler interface [6].…”

mentioning

confidence: 99%

“…The minima of p and Hv result from the most complete realization of the energy interaction between the components, the formation of relatively large boundary structures, a decrease in the elasticity of the macrochains in them, and the loosening action of the filler [6,8,10].…”

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Effect of increased compacting pressures on the physicomechanical characteristics of metal-filled polyvinyl chloride

Mukha

Kolupaev

Mukha

2000

J Eng Phys Thermophys

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Based on the principles of linear thermodynamics, molecular physics, and spatial organization of amorphous polymers, the energy of formation of microdefects and the increments in their volumes as functions of the compacting pressure and the content of the filler of polyvinyl chloride systems are calculated.Among promising methods of modifying the physicomechanical properties of polymers is their doping with highly disperse additions and directional control of the technological processes of producing composite materials [1]. Here the question of studying the effect of the T-p compaction mode on their properties remains virtually open [2,3].As the subject of inquiry, we selected industrial polyvinyl chloride (PVC) of the S-65 grade with a molecular weight of 1.4-105 that was produced by suspension polymerization and was purified by reprecipitation from soluton. Cyclohexane of "KhCh" grade (Tboil = 425.5 K, n 29°r = 0.9466) was chosen as the solvent. For more intense dissolution of PVC in cyclohexane, a prepared 3% solution was heated on a water bath with a reflux cooler at a temperature of 310 K. PVC was reprecipitated from the obtained solution with methanol (Tboil = 335 K, n 29°K = 0.7925). The precipitated polymer was washed repeatedly on a filter with methanol and dried in air and then in vacuum at a temperature of 320 K to a constant weight in 10 h. The reprecipitated PVC was a homogeneous powder of white color that was subsequently used for producing composites. As the filler, a highly disperse iron (Fe) powder that was reduced with hydrogen was selected, with a predominant particle size of 15 pro.The specimens were prepared in the T-p mode, which differs from the p-T mode [4] in that the polyvinyl chloride was placed in a mold, which was heated to a temperature of 460 K, and only afterward was a required pressure of 10, 60, 120, 200, and 300 MPa applied, maintaining the temperature mode for another 7 min. Spontaneous cooling during formation of blocks was effected at the corresponding pressure up to T < Tgl. The glass transition temperature (Tgl of the original PVC was 354 K, and the yield temperature (Ty) was 456 K.The density (p) of the PVC systems was studied using the method of hydrostatic weighing [5], and the hardness (Hv) was studied, using the Vickers method, on a PMT-3 microhardness meter with loading for a time of 2 min [6]. With a confidence coefficient of 0.95, the mean relative measurement error for p and Hv, respectively, was 0.2 and 1.3%. Table 1 presents experimental data on the physicomechanical properties of the PVC systems. It follows from the data presented that the density of the original polymer increases_ with the pressure over the entire range considered. However, the density of the PVC compositions increases only at pressures up to 200 MPa. A further increase in it leads to a decrease in the density adequate for the filling (see Table 1).The rise in the density of the PVC systems in the range of 10-200 MPa is caused by "healing" of defects of the material, i.e., a reduction in its fr...

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confidence: 97%

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confidence: 99%

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confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Effect of increased compacting pressures on the physicomechanical characteristics of metal-filled polyvinyl chloride

Mukha

Kolupaev

Mukha

2000

J Eng Phys Thermophys

Self Cite

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Modification of the Properties of Polyvinylbutyral with Highly Dispersed Fillers

Cited by 1 publication

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Effect of increased compacting pressures on the physicomechanical characteristics of metal-filled polyvinyl chloride

Effect of increased compacting pressures on the physicomechanical characteristics of metal-filled polyvinyl chloride

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