What is the density of vulcanized rubber?
0.950 g/cc
Vendors:
| Physical Properties | Metric | English |
|---|---|---|
| Density | 0.950 g/cc | 0.0343 lb/in³ |
| Mechanical Properties | Metric | English |
| Hardness, Shore A | 30 – 100 | 30 – 100 |
| Hardness, Shore D | 30 – 45 | 30 – 45 |
How do you find the crosslink density of rubber?
- • Crosslink density of a vulcanised rubber can be measured using the solvent.
- swelling method.
- • A good solvent (for the unvulcanised rubber) should be used such that the.
- crosslinked rubber can absorb and swell as much as possible until the retractive.
- forces in the network balance the forces of swelling.
How do you calculate crosslink density?
The molecular weight between cross-links is simply the average molecular weight of the monomers, Mav, divided by the number of cross-links per molecule: (7.10) The cross-link density resulting from chemical cross-link chains can then be calculated by dividing the polymer density by Mc.
What is crosslink density of rubber?
The average molecular weight of the intercrosslink chains (Mc) was about 7089 g/mol (taking the density of rubber as 0.95 g/cm3) when the tensile strength reached its maximum value in the studied system.
Does rubber have density?
The density of soft rubber is 0.11 grams per cubic centimeter.
How do you find the density of rubber?
The true innovation of the RD 3000 is the way it measures density. Typically, a strip of rubber is cut directly from the mill, identified at the control panel of the instrument and weighed. All air is compressed out of the sample in a compression cylinder and the volume of the material is taken.
How does crosslinks calculate molecular weight?
The molecular weight between crosslinks of a perfect and:ideal network, for which this parameter is equal to l, is given by: Mc = pRT/G’ (2) where G’ can be measured by dynamic mechanical analysis. where Mnis the number average molecular weight of the base polymer.
How is vulcanized rubber made?
The Basics of Vulcanized Rubber It’s made via a curing process in which the rubber’s elastomers harden in response to heat and sulfur. Exposure to heat and sulfur creates new cross-links in the rubber that, ultimately, makes the rubber stronger and more elastic.
What density is rubber?
Density of selected solids
| Solid | Density (10³ kg/m³) |
|---|---|
| Rubber, hard | 1.2 |
| Rubber, soft commercial | 1.1 |
| Rubber, pure gum | 0.91 – 0.93 |
| Rubber, foam | 0.070 |
What are the steps of calculating density?
The five steps for determining density can be expressed in simple form as follows: measure the mass of the container, measure the volume of the liquid, measure the combined mass of the liquid and the container, determine the mass of the liquid alone and divide the mass by the volume.
How to calculate crosslink density in vulcanised rubber?
For vulcanised rubber containing filler, Vr is obtained from the following equation: = the volume fraction of filled rubber in swollen gel, φ= the volume fraction of filler in the unswollenfilled rubber, c= the filler rubber interaction parameter. Failing to consider the filler effect will lead to over estimation of crosslink density.
What happens to rubber when it is vulcanized?
Rubber becomes less elastic as it is cooled, and at a certain temperature (around \70 C for vulcanized rubber) it undergoes a continuous phase transition into a typ- ical brittle glass-like state as the rotational degrees of freedom of the joints freeze out.
What is the elastic force of a crosslink in rubber?
The value of crosslink density may be in the order of 10 -3 to 10 -5 mol/cm 3 for a typical rubber material, corresponding to 15 to 1500 monomer units between the crosslinks. The elastic force of retraction, elasticity, is directly proportional to the crosslink density.