scholarly journals Rubber Transferase Activity and Rubber Particle Sizes Derived from Lactarius Mushrooms

2013 ◽  
Vol 25 (8) ◽  
pp. 5185-5188
Author(s):  
Takeshi Ieda ◽  
Takeshi Nakamura ◽  
Yukino-Miyagi Inoue ◽  
Norimasa Ohya
Keyword(s):  
Rubber Particle ◽  
Transferase Activity ◽  
Particle Sizes ◽  
Rubber Transferase

Submicrometer Thermoplastic Vulcanizates Obtained by Reaction-Induced Phase Separation of Miscible Poly(Ε-Caprolactone)/Dimethacrylate Systems

2010 ◽  
Vol 83 (2) ◽  
pp. 160-180 ◽  
Author(s):  
Roy L'Abee ◽  
Marloes Verbruggen ◽  
Martin van Duin ◽  
Anne Spoelstra ◽  
Han Goossens
Keyword(s):  
Phase Separation ◽  
Critical Stress ◽  
Rubber Particle ◽  
Lamellar Thickness ◽  
Particle Sizes ◽  
Hydrogen Atoms ◽  
Complex Interplay ◽  
Peroxide Decomposition ◽  
Rubber Particles ◽  
Thermoplastic Vulcanizates

Abstract Reaction-induced phase separation of initially miscible mixtures of poly(Ε-caprolactone) (PCL) and elastomer precursors based on difunctional methacrylate resins was applied to prepare thermoplastic vulcanizates (TPVs) with rubber particle sizes ranging from 80 to 900 nm. The radicals formed by the peroxide decomposition initiate the formation of a cross-linked rubber network with gel contents exceeding 90%, but also abstract hydrogen atoms from the aliphatic moieties in PCL. This leads to the formation of PCL-grafted rubber particles, which show a high nucleating efficiency for crystallization of the PCL matrix. It is demonstrated that the tensile and elastic properties of these TPVs are determined by a complex interplay of the morphology, the type of elastomer precursor, the extent of PCL grafting, the crystallinity, and the lamellar thickness. The materials showed a rheological behavior that is typical for TPVs, for which the melt changes from an elastic to a viscous behavior above a critical stress.

Effect of Crumb Rubber Particle Size and Content on Properties of Crumb Rubber Modified (CRM) Asphalt

2011 ◽  
Vol 99-100 ◽  
pp. 955-959 ◽  
Author(s):  
Wei Dong Cao ◽  
Shu Tang Liu ◽  
Xin Zhuang Cui ◽  
Xiao Qing Yu
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Rubber Particle ◽  
Crumb Rubber ◽  
Particle Sizes ◽  
Test Results

Effects of crumb rubber of different particle sizes (20mesh, 40mesh, 60mesh, 80mesh and120mesh) and contents (10%, 15% and 20% by weight of the total of CRM asphalt) on the properties of CRM asphalt and change rule of performance of CRM asphalt with reaction temperature and time were studied in laboratory. The results indicate that CRM asphalt has the best performance when the particle size of crumb rubber used is 80 mesh and the content is 15%. The performance of CRM asphalt is strongly depended on reaction temperature and time. When reaction temperature is higher than 200°C and time more than 60 minutes, the viscosity of CRM asphalt significantly decline with reaction temperature rising and time delaying. The performance of CRM asphalt starts aging when reaction time more than 4 hours at high temperature. Based on test results, some suggestions for production and application of CRM asphalt are put forward.

scholarly journals Effects of Rubber Size on the Cracking Resistance of Rubberized Mortars

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3132 ◽  
Author(s):  
Yong Yu ◽  
Han Zhu
Keyword(s):  
Particle Size ◽  
Mechanical Test ◽  
Rubber Particle ◽  
Inhibitory Effect ◽  
Interfacial Transition Zone ◽  
Particle Sizes ◽  
Cracking Resistance ◽  
Eccentric Ring ◽  
Rubberized Mortar ◽  
Restrained Ring

This study investigated the cracking resistance of rubberized cement-based mortars. Three rubber particle sizes were used: Rubber A (major particle size 2–4 mm), Rubber B (major particle size 1–3 mm), and Rubber C (major particle size 0–2 mm). Traditional restrained ring shrinkage test (RRST), new restrained squared eccentric ring shrinkage test (RSERST), mechanical test, and scanning electron microscopy test were conducted. Results showed that the cracking inhibitory effect of Rubber B was the highest among the three rubber particle sizes. SEM results revealed that the particle size of the rubber does not have much effect on the ITZ (interfacial transition zone) position of rubber and cement paste. For the strength differences of the three types of rubberized mortar, it is mainly because the specific surface area increased as the rubber size decreased, which lead to more ITZ positions and pore structures. Our study verified that RSERST can predict the cracking position and shorten the test period. Compared with RRST, RSERST can also increase the restriction degree. K R is defined as the intensification factor of RSERST restriction degree. The average intensification factor is K R ¯ = 1.17 .

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