The effect of physical crosslinking on dynamic mechanical properties of polycarbonate low molecular weight additive systems

1981 ◽  
Vol 4 (1-2) ◽  
pp. 127-132 ◽  
Author(s):  
Leszek Makaruk ◽  
Hanna Polanska
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Dynamic Mechanical Properties ◽  
Low Molecular Weight ◽  
Dynamic Mechanical ◽  
Physical Crosslinking

Silica-Reinforced Natural Rubber with Epoxidized Low Molecular Weight Rubber as a Compatibilizer

2013 ◽  
Vol 747 ◽  
pp. 522-525 ◽  
Author(s):  
Prachid Saramolee ◽  
Kannika Sahakaro ◽  
Natinee Lopattananon ◽  
Wilma Dierkes ◽  
Jacques W.M. Noordermeer
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Glass Transition ◽  
Natural Rubber ◽  
Periodic Acid ◽  
Dynamic Mechanical Properties ◽  
Low Molecular Weight ◽  
Service Temperature ◽  
Dynamic Mechanical ◽  
Tan Δ

This work investigates the effect of epoxidized low molecular weight natural rubber (ELMWNR) in silica-filled NR compounds on processing, mechanical and dynamic mechanical properties. The ELMWNRs with mol% epoxide groups varying from 0-50 and molecular weight in a range of 50,000-60,000 g/mol were prepared from depolymerization of epoxidized natural rubber using periodic acid in latex state. They were then added in the silica-filled NR compounds as a compatibilizer at varying loading from 0-15 phr. The addition of ELMWNR decreases compound viscosity and Payne effect, i.e. filler-filler interaction. The optimal mechanical properties of silica-filled vulcanizates are observed at the ELMWNR-28 (28 mol% epoxide) loading of 10 phr. The incorporation of ELMWNR with 28 and 51 mol% epoxide groups into NR compounds introduces a second glass transition temperature and affects on their dynamic mechanical properties. Higher epoxide content leads to higher Tan δ of the rubber vulcanizates in the range of normal service temperature.

COMPARATIVE PROPERTIES OF SILICA- AND CARBON BLACK-REINFORCED NATURAL RUBBER IN THE PRESENCE OF EPOXIDIZED LOW MOLECULAR WEIGHT POLYMER

2014 ◽  
Vol 87 (2) ◽  
pp. 320-339 ◽  
Author(s):  
P. Saramolee ◽  
K. Sahakaro ◽  
N. Lopattananon ◽  
W. K. Dierkes ◽  
J. W. M. Noordermeer
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Carbon Black ◽  
Natural Rubber ◽  
Periodic Acid ◽  
Dynamic Mechanical Properties ◽  
Low Molecular Weight ◽  
Molecular Weight Polymer ◽  
Dynamic Mechanical ◽  
Chemical Structures

ABSTRACT This work investigates the effect of epoxidized low molecular weight natural rubber (ELMWNR) in silica- and carbon black-filled natural rubber (NR) compounds on processing and mechanical and dynamic mechanical properties. The ELMWNRs with different mol% epoxide content were prepared from depolymerization of epoxidized NR using periodic acid in latex state to have a molecular weight in a range of 50 000–60 000 g/mol. Their chemical structures and actual mol% of epoxide were analyzed by 1H NMR. The ELMWNRs were added to the filled NR compounds as compatibilizers at varying loadings from 0 to 15 phr. The addition of ELMWNR decreases compound viscosity and the Payne effect, that is, filler–filler interaction, of the silica-filled compound. In the silica–silane compound and the compound with 28 mol% epoxide (ELMWNR-28), the compound viscosities are comparable. The optimal mechanical properties of silica-filled vulcanizates are obtained at the ELMWNR-28 loading of 10 phr. In contrast, the addition of ELMWNR to a carbon black-filled compound shows only a plasticizing effect. The incorporation of ELMWNR into NR compounds introduces a second glass transition temperature and affects their dynamic mechanical properties. Higher epoxide contents lead to higher loss tangent values of the rubber vulcanizates in the range of the normal service temperature of a tire.

Effect of block molecular weight on the mechanical and dynamic mechanical properties of segmented polyamide

Polymer ◽  
1998 ◽  
Vol 39 (17) ◽  
pp. 3967-3975 ◽  
Author(s):  
Subiman Ghosh ◽  
D. Khastgir ◽  
Anil K. Bhowmick
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Dynamic Mechanical Properties ◽  
Dynamic Mechanical

Mechanical and Dynamic Mechanical Properties of Degradable Polyurethane Foams with PEG/PCL Mixed Soft Segments

2011 ◽  
Vol 183-185 ◽  
pp. 1611-1615 ◽  
Author(s):  
Jian Hua Wang ◽  
Shuen Liang ◽  
Yan Yan Wang ◽  
Chun Rong Tian ◽  
Xiu Li Zhao
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Tensile Strength ◽  
Compressive Strain ◽  
Dynamic Mechanical Properties ◽  
Polyurethane Foams ◽  
Elongation At Break ◽  
Dynamic Mechanical ◽  
Soft Segments ◽  
And Storage

Polyurethane (PU) with mixed poly(ethylene glycol) / poly(ε-caprolactone) (PEG/PCL) soft segments is a representatively kind of degradable polyurethane material. Polyurethane foams (PUF) with mixed PEG/PCL soft segments were synthesized by using one pot method, and their mechanical and dynamic mechanical properties were investigated. Influences of PEG/PCL weight ratio and molecular weight of soft segments on PUF's mechanical and dynamic mechanical properties were studied. The results showed that: with increasing content of PCL, PUF's tensile strength, elongation at break, stress at certain tensile/compressive strain and storage modulus increased gradually; with increasing molecular weight of soft segment, PUF's elongation at break increased, but tensile strength, stress at certain tensile/compressive strain and storage modulus all decreased accordingly; glass transition temperature (Tg) of PUF with various soft segments decreased according to the following sequence: PEG-400, PCL-210N, PEG-1000 and PTMG1000; loss factor of PUF with PEG/PCL mixed soft segments was higher than that of PUF with individual PEG or PCL soft segments.

Effect of Molecular Weight on Dynamic Mechanical Properties of SKD cis-1,4-Butadiene Rubber

1967 ◽  
Vol 40 (2) ◽  
pp. 517-521
Author(s):  
A. I. Marei ◽  
E. A. Sidorovich
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Average Molecular Weight ◽  
Dynamic Mechanical Properties ◽  
Considerable Effect ◽  
Butadiene Rubber ◽  
Dynamic Mechanical ◽  
Temperature Range ◽  
Molecular Weights ◽  
Dynamic Mechanical Behavior

Abstract In the high-elastic temperature range the molecular weight has a considerable effect on the dynamic mechanical properties of linear (uncrosslinked) SKD cis-1, 4-butadiene rubber. In this temperature range an unequivocal correlation exists between the rebound resilience at a given temperature and the viscosity average molecular weight, and the determination of the resilience can therefore be recommended as a rapid method of finding the molecular weight of SKD. A similarity is found in the dynamic mechanical behavior of rubbers of different molecular weights in the high-elastic temperature range. In the low-temperature range an increase in the molecular weight of crystalline polymers of SKD is accompanied by an impairment of their elastic properties.

Dynamic Mechanical Properties of Dilute Polystyrene Solutions; Dependence on Molecular Weight, Concentration, and Solvent1

1964 ◽  
Vol 68 (7) ◽  
pp. 1974-1982 ◽  
Author(s):  
J. E. Frederick ◽  
N. W. Tschoegl ◽  
John D. Ferry
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Dynamic Mechanical Properties ◽  
Dynamic Mechanical ◽  
Weight Concentration

Effects of molecular weight on the dynamic mechanical properties and interfacial properties of carbon fiber fabric-reinforced polyetherketone cardo composites

2016 ◽  
Vol 28 (10) ◽  
pp. 1210-1217 ◽  
Author(s):  
Yan Ma ◽  
Ying Bi ◽  
Xingdi Zhang ◽  
Daming Wang ◽  
Guodong Dang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Carbon Fiber ◽  
Interfacial Properties ◽  
Dynamic Mechanical Properties ◽  
Dynamic Mechanical ◽  
Carbon Fiber Fabric ◽  
Fiber Fabric

scholarly journals Thermal and dynamic mechanical properties of vitamin E infused and blended ultra-high molecular weight polyethylenes

2010 ◽  
Vol 120 (4) ◽  
pp. 2282-2291 ◽  
Author(s):  
J. A. Puértolas ◽  
M. J. Martínez-Morlanes ◽  
M. D. Mariscal ◽  
F. J. Medel
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Vitamin E ◽  
High Molecular Weight ◽  
Dynamic Mechanical Properties ◽  
Dynamic Mechanical ◽  
Ultra High Molecular Weight
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