What solvent should be used for the polymer?
Solvents for Common Polymers
| Polymer | Solvent |
|---|---|
| Polyethylene (HDPE) | HC and halogenated HC |
| Polypropylene (atactic) | HC and halogenated HC |
| Polybutadiene | HC, THF, ketones |
| Polystyrene | ethylbenzene, CHCl3, CCl4, THF, MEK |
What is the best solvent for polyethylene?
Both forms of polyethylene are highly resistant to acids, caustic alkaline liquids and inorganic solvents. This makes polyethylene useful as a container in laboratories for storing acids and bases. However some organic solvents such as benzene and acetone can dissolve polyethylene.
What is the best solvent for polypropylene?
A good solvent for each of polyethylene & polypropylene is a mixture of TCB ” 1,2,4-trichlorobenzene” with few percent (0.015 %) BHT ” butylated hydroxytoluene”. Unfortunately, the temperature required for dissolution (of both polymers in the mixed solvent) is 160 oC.
How do solvents break down polymers?
Unlike non- polymeric materials, polymers do not dissolve instantaneously, and the dissolution is controlled by either the disentanglement of the polymer chains or by the diffusion of the chains through a boundary layer adjacent to the polymer–solvent interface.
How do you clean polymers?
How To Clean Enteric Polymers
- Common Approach 1: A two detergent process of alternating highly alkaline detergents for the polymer and highly a highly acidic detergent for the insolubles.
- Common Approach 2: Use of commodity products like sodium bicarbonate, sodium hydroxide and solvents.
- Select the Right Detergent.
Will hexane dissolve polyethylene?
There isn’t much that will dissolve polyethylene. The usual array of organic solvents (THF, ether, acetonitrile, acetone, DMSO, hexane, toluene) are more or less useless in this regard.
What is polyethylene soluble in?
Polyethylene (other than cross-linked polyethylene) usually can be dissolved at elevated temperatures in aromatic hydrocarbons such as toluene or xylene, or in chlorinated solvents such as trichloroethane or trichlorobenzene. Polyethylene absorbs almost no water.
Does ethanol dissolve polypropylene?
Polypropylene copolymers swell more than homopolymers, indicating greater absorption. Such nonpolar liquids as benzene, carbon tetrachloride, and petroleum ether have a higher absorption rate with polypropylene than polar media such as ethanol and acetone.
How do you dissolve polyethylene?
Xylene is the best solvent for polyethylene. You need to heat it to fasten the dissolution. As Xylene has boiling point range from 138 to 144 oC depending upon the type.
How do you increase the solubility of a polymer?
The solubility of polymers also depends on temperature. Usually, the temperature coefficient is positive, i.e. fractional dissolution can be carried out with a given solvent (or a non-solvent/solvent mixture at constant composition) by raising the temperature.
How do you remove polymer clay residue?
Hand Sanitizer cleans clay residue off your hands. Alcohol dissolves polymer clay, so it works well to rub some alcohol-based hand sanitizer gel into your hands, and then wipe them clean with a paper towel. Follow up with a soap and water wash and you’re good as new.
What can I use to clean polymer clay?
Try alcohol or acetone: One cool trick is to dip a Q-tip in rubbing alcohol or acetone. You can use nail polish remover, but make sure it isn’t colored. Just swipe your dipped Q-tip or a soaked tissue across the surface you want to clean and it will pull the debris off the clay.
What is polymer solubility?
Polymer solubility theory describes the behavior of polymers in mixtures and solutions with use of two main parameters: the solubility parameter and the Flory−Huggins interaction parameter.
Does ethanol dissolve polyethylene?
Poly(ethylene terephthalate), PET or PETE – PET is not very soluble in ethanol or isopropanol, but prolonged exposure may cause crazing or stiffening due to the dissolution of plasticizers. High-Density polyethylene, HDPE – HDPE is resistant to most things.
Does MEK dissolve polyethylene?
MEK is used as an effective plastic welding agent. It can dissolve many plastics, including polystyrene, and can bind plastics together. MEK works as a welding agent by dissolving the surface where it is applied and then evaporating – acting as more of a chemical welding agent.
Does xylene dissolve polypropylene?
At elevated temperature, polypropylene can be dissolved in nonpolar solvents such as xylene, tetralin and decalin.
Does xylene dissolve polyethylene?
Xylene is the best solvent for polyethylene. You need to heat it to fasten the dissolution.
What is the criteria for polymer solubility?
Solubility depends on the nature of the solvent, the temperature of the solution, the topology of the polymer, and the crystallinity. Cross-linked polymers do not dissolve, but only swell with the solvent when an interaction between the polymer and the solvent occurs.
How do you calculate log P of a compound?
log P The log P value for a compound is the logarithm (base 10) of the partition coefficient (P), which is defined as the ratio of the compound’s organic (oil)-to-aqueous phase concentrations: Partition Coefficient (P) = [Organic] / [Aqueous], where [ ] is the compound’s concentration in that solvent phase log P = Log 10 (P)
What is the log p value?
The logarithm of the ratio of the concentrations of the unionized solute in the solvents is called log P. The log P value is also known as a measure of lipophilicity1. The distribution coefficient for ionizable compounds depends on the pH. The pharmaceutical industry measures the log P value at pH = 7.4.
What is log P of lipophilicity?
The logarithm of the ratio of the concentrations of the unionized solute in the solvents is called log P. The log P value is also known as a measure of lipophilicity1. The distribution coefficient for ionizable compounds depends on the pH. The pharmaceutical industry measures the log P value at pH = 7.4.
What is the solubility of low molecular weight polymers?
• Low MW polymers are soluble in a wide variety of solvents at low temperatures. The presence of any high molecular weight polymer can greatly reduce its solubility. Dissolution is improved with longer times, higher temperatures, and solvents with polarity similar to the polymer.