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Elastomer toughening mechanism
by：CSSSLD
2021-02-03
Wen injection tooling/VIP
since appeared in the mid - 1950 - s elastomer toughening mechanism, many scholars in the study of polymer alloy and toughening system process, continuously explore toughening system and mechanism, from the initial simple qualitative explanation gradually to classification, model, quantitative direction. Toughening system has simple rubber elastomer, thermoplastic elastomer and rigid particles and nano materials in the mail.
the direct absorption energy theory is that when sample impact crack, then, on both sides of the rubber particles across the crack, crack development must be stretched rubber particles, the stretching, absorb a lot of energy, and thus improve the impact strength of the material.
the second transition temperature theory polymer toughness is often associated with secondary transition temperature, in rubber toughening plastics, the toughness of the increase is associated with the secondary change.
organic rigid particles toughening theory was first put forward the new concept of organic rigid particles toughening plastic and cold-drawn concept to explain the blend improve toughness. Think for organic rigid particles toughening polymer, in the process of drawing, because of the dispersed particles and matrix of young's modulus and poisson's ratio in the dispersed phase is the difference between the equatorial plane of static pressure is strong, under the effect of the static pressure is strong, the dispersed phase particle yield and produce cold drawn, the large plastic deformation, absorb the skills, so as to improve the toughness of the material.
proposed the theory of shear yield shear yield theory, this theory is developed on the basis of yield expansion theory. Its main thought that rubber particles in the matrix resin phase produced 3 d static tension, the resulting volume expansion, increase the free volume of the matrix, thereby lowering the glass transition temperature of the substrate, the substrate to produce plastic deformation.
silver lines - Shear zone theory on the basis of a large number of laboratory crazing - are put forward Shear zone theory, comparatively is produced in the 1970 s, an important theory accepted by the industry average.
hole theory refers to the low or high speed in the process of deformation under the effect of three dimensional stress, occurs within the rubber particles or rubber particle and matrix interface between cavitation phenomenon. The theory is that: the action of external force rubber modification of plastics, rubber particles dispersed phase due to stress concentration, caused the rubber and the matrix of interface and its empty, rubber granules by cavitation, the rubber around the pure tensile stress is released, the cavity between the stress state of thin matrix ligament, from the 3 d into one dimension, and plane stress, plane strain can be converted to the new state of stress is beneficial to the formation of shear band. Therefore, cavity itself does not constitute a material of the brittle ductile transition, he only lead to material stress state change, thus cause shear yield, prevent cracks further expand, spend a lot of energy, to improve the toughness of the material.
toughening theory put forward the concept of critical particle distance criterion, has carried on the science classification to thermoplastic polymer matrix and the establishment of a plastic toughening brittle ductile transition more than permeability model, the toughening theory by qualitative analysis to quantitative level.
crack the core theory of rubber particles as stress concentration, produced a large number of small crack, rather than a few large crack extension than many small crack extension a handful of big crack needs more energy. At the same time, a large number of small crack stress field interference, abate the forefront of the development of crack stress, thus, will slow down the development of crack and cause crack termination.
more wonderful to share: the development of polymer blending modification, click directly.
or copy the link: http://www. csssld。 cn//html/2016/Notice_0318/175。 HTML
nantong on plastic products factory's official website: http://www. csssld。 Cn / /
source network trimmer/injection molding processing and VIP
since appeared in the mid - 1950 - s elastomer toughening mechanism, many scholars in the study of polymer alloy and toughening system process, continuously explore toughening system and mechanism, from the initial simple qualitative explanation gradually to classification, model, quantitative direction. Toughening system has simple rubber elastomer, thermoplastic elastomer and rigid particles and nano materials in the mail.
the direct absorption energy theory is that when sample impact crack, then, on both sides of the rubber particles across the crack, crack development must be stretched rubber particles, the stretching, absorb a lot of energy, and thus improve the impact strength of the material.
the second transition temperature theory polymer toughness is often associated with secondary transition temperature, in rubber toughening plastics, the toughness of the increase is associated with the secondary change.
organic rigid particles toughening theory was first put forward the new concept of organic rigid particles toughening plastic and cold-drawn concept to explain the blend improve toughness. Think for organic rigid particles toughening polymer, in the process of drawing, because of the dispersed particles and matrix of young's modulus and poisson's ratio in the dispersed phase is the difference between the equatorial plane of static pressure is strong, under the effect of the static pressure is strong, the dispersed phase particle yield and produce cold drawn, the large plastic deformation, absorb the skills, so as to improve the toughness of the material.
proposed the theory of shear yield shear yield theory, this theory is developed on the basis of yield expansion theory. Its main thought that rubber particles in the matrix resin phase produced 3 d static tension, the resulting volume expansion, increase the free volume of the matrix, thereby lowering the glass transition temperature of the substrate, the substrate to produce plastic deformation.
silver lines - Shear zone theory on the basis of a large number of laboratory crazing - are put forward Shear zone theory, comparatively is produced in the 1970 s, an important theory accepted by the industry average.
hole theory refers to the low or high speed in the process of deformation under the effect of three dimensional stress, occurs within the rubber particles or rubber particle and matrix interface between cavitation phenomenon. The theory is that: the action of external force rubber modification of plastics, rubber particles dispersed phase due to stress concentration, caused the rubber and the matrix of interface and its empty, rubber granules by cavitation, the rubber around the pure tensile stress is released, the cavity between the stress state of thin matrix ligament, from the 3 d into one dimension, and plane stress, plane strain can be converted to the new state of stress is beneficial to the formation of shear band. Therefore, cavity itself does not constitute a material of the brittle ductile transition, he only lead to material stress state change, thus cause shear yield, prevent cracks further expand, spend a lot of energy, to improve the toughness of the material.
toughening theory put forward the concept of critical particle distance criterion, has carried on the science classification to thermoplastic polymer matrix and the establishment of a plastic toughening brittle ductile transition more than permeability model, the toughening theory by qualitative analysis to quantitative level.
crack the core theory of rubber particles as stress concentration, produced a large number of small crack, rather than a few large crack extension than many small crack extension a handful of big crack needs more energy. At the same time, a large number of small crack stress field interference, abate the forefront of the development of crack stress, thus, will slow down the development of crack and cause crack termination.
more wonderful to share: the development of polymer blending modification, click directly.
or copy the link: http://www. csssld。 cn//html/2016/Notice_0318/175。 HTML
nantong on plastic products factory's official website: http://www. csssld。 Cn / /
source network trimmer/injection molding processing and VIP
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