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Home » Elastomers » Polyether Polyols » Polyether Diols

Polyether Diols

Tri-iso distributes a wide range of polyether diols that allow formulators to produce high quality polyurethane elastomers.  Polyols contain reactive hydroxyl (OH) groups which react with isocyanate (NCO) groups on isocyanates to form polyurethane elastomers. 

Polyether-based polyurethane elastomers exhibit enhanced hydrolytic stability and excellent resistance to weak acids and bases compared to polyester-based polyurethane elastomers.  However, polyether-based polyurethane elastomers are more susceptible to UV radiation and provide poor resistance to oils and fuels compared to polyester-based polyurethane elastomers.

Polyether diols are formed by propoxylating an initiator (addition of propylene oxide to an initiator).  In some cases, the initiator is ethoxylated (addition of ethylene oxide) as well as propoxylated.  Ethoxylation can be incorporated in the middle of the polyol, or at the end (tip) of the diol. When polyether diols have ethylene oxide tips, the resulting hydroxyl groups are primary hydroxyls; propylene oxide tips yield secondary hydroxyl groups.  Secondary hydroxyl groups react slower than primary hydroxyl groups as a result of the increased steric hindrance.  Ethylene oxide is more hydrophilic, and thus polyether polyols with ethylene content tend to produce polyurethane elastomers that are more hydrophilic than those produced with polyether polyols that are made solely with propylene oxide.  The initiator used to produce the diol can impact reactivity as well as functionality of the polyol.  Amine initiated polyether diols are self-catalyzing and react faster than standard glycol initated polyether diols.   Higher performance polyether diols are formed by ring opening of tetrahydrofuran (THF) to form polytetramethylene ether glycol (PTMEG). 

There are several key characteristics which define what performance properties a given polyether diol will impart in a given polyurethane elastomer.  These characteristics include:  the hydroxyl number or hydroxyl value  (OH value), OH equivalent weight, and the molecular weight of the diol.

Hydroxyl number (OH ) is the measure of the hydroxyl group content of gram of diol.  Hydroxyl value is measured by titrating a known mass of diol against potassium hydroxide (KOH), and is expressed as mg KOH/g.  Lower hydroxyl values indicates lower hydroxyl content and a higher molecular weight for the overall diol.

OH equivalent weight is the number of grams of a given product that contains one equivalent of  hydroxyl groups (NCO).  Equivalent weight = 56100/OH

Molecular Weight is determined by multiplying the equivalent weight by the diol functionality (2).

 

Your Tri-iso Technical Sales Representative is available to assist you in the selection of the appropriate polyether diol that will provide the specific properties you are trying to obtain. Click here to request a quote.

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  Product Name  Model   
Carpenter Carpol PGP-1000
Carpenter Carpol PGP-1000

1000MW Propylene Glycol based polyether polyol diol. read more
Carpol PGP-1000
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Carpenter Carpol PGP-1000-60
Carpenter Carpol PGP-1000-60

1000MW Propylene Glycol based polyether polyol diol. read more
Carpol PGP-1000-60
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Carpenter Carpol PGP-2000
Carpenter Carpol PGP-2000

Carpol PGP-2000 is a 2000MW Propylene Glycol based polyether polyol diol. read more
Carpol PGP-2000
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Carpenter Carpol PGP-2000-60
Carpenter Carpol PGP-2000-60

2000MW Propylene Glycol based polyether polyol diol. read more
Carpol PGP-2000-60
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Carpenter Carpol PGP-2012
Carpenter Carpol PGP-2012

2000MW Propylene Glycol based polyether diol with 12% EO cap read more
Carpol PGP-2012
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Carpenter Carpol PGP-3000
Carpenter Carpol PGP-3000

3000MW Propylene Glycol based polyether polyol diol. read more
Carpol PGP-3000
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Carpenter Carpol PGP-3000-60
Carpenter Carpol PGP-3000-60

3000MW Propylene Glycol based polyether polyol diol. read more
Carpol PGP-3000-60
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Carpenter Carpol PGP-3815
Carpenter Carpol PGP-3815

3800MW Propylene Glycol based polyether diol with 15% EO Cap read more
Carpol PGP-3815
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Carpenter Carpol PGP-3920
Carpenter Carpol PGP-3920

4000MW propylene glycol initiated polyether diol with 20% EO cap read more
Carpol PGP-3920
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Carpenter Carpol PGP-400
Carpenter Carpol PGP-400

400MW Propylene Glycol based polyether polyol diol. read more
Carpol PGP-400
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Carpenter Carpol PGP-400-60
Carpenter Carpol PGP-400-60

Carpol PGP-400-60 is a 400MW Propylene Glycol based polyether polyol diol. read more
Carpol PGP-400-60
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Carpenter Carpol PGP-4000
Carpenter Carpol PGP-4000

4000MW Propylene Glycol based polyether polyol diol. read more
Carpol PGP-4000
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Carpenter Carpol PGP-4000-60
Carpenter Carpol PGP-4000-60

4000MW Propylene Glycol based polyether polyol diol. read more
Carpol PGP-4000-60
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Carpenter Carpol PGP-4025
Carpenter Carpol PGP-4025

4000MW Propylene Glycol based polyether diol with 25% EO cap read more
Carpol PGP-4025
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Carpenter Carpol PGP-4025-60
Carpenter Carpol PGP-4025-60

4000MW Propylene Glycol based polyether diol with 25% EO cap read more
Carpol PGP-4025-60
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LyondellBasell  Polymeg 1000
LyondellBasell Polymeg 1000

Polymeg 1000 is Polyether diol - Polytetramethylene ether glycol (PTMEG) for hig read more
Polymeg 1000
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LyondellBasell Polymeg 650
LyondellBasell Polymeg 650
Polymeg 650
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