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FAQ | POLYCAPROLACTONE POLYOL

Explore our frequently asked questions

What makes Polycaprolactone Polyols unique in polyurethanes?

Polycaprolactone polyols are a special class of aliphatic polyester polyols, used in the soft block segment of high-performance polyurethane elastomers. The polycaprolactone polyols are produced with very low acid values (significantly improves hydrolytic stability), perfect hydroxyl end-group termination (excellent reactivity and high molecular weight control), narrow MW distributions (low viscosities including in the prepolymer form) and low glass transitions that affect good low temperature flexibility in polyurethane elastomers.

 

What are the different grades of polycaprolactone polyols?

The caprolactone polyols are available in molecular weight grades from 310 to 4000, and are offered as diols, triols an tetraols. They are created by a Ring-Opening Polymerization (ROP) process under mild conditions using a “initiator” diol or triol and caprolactone monomer.  The process is depicted below.

polycaprolactone-structure-faq


The initiator selected allows the design of customized features in the polycaprolactone polyols which are manifested in the performance of the resulting polyurethane elastomers.

 

What effects can be achieved through the selection of the initiator?

While many initiator types are use, the following exemplifies the effects of three diol initiators used.

  • Butanediol: Affords high cut, chip and tear resistance, high tensile properties
  • Neopentyl Glycol: Reduced the polyol crystallization, the propensity of the PUR to “cold harden” and affords better hydrolytic stability
  • Diethylene Glycol: Contributes some polyether performance characteristics and more liquid diols



Gantrade experts can assist in the selection of the appropriate polycaprolactone polyol for your specific application.

 

What are some of the key attributes of polyurethanes based on polycaprolactone diols?

The molecular features of the polycaprolactone polyols manifest themselves in polyurethanes characterized by the following property profiles, many of which are best-in-class performance attributes.

  • Superior resistance to hydrolysis
  • Excellent weatherability and UV stability
  • Good high temperature performance and low temperature flexibility
  • Durability, flex-fatigue life and elastic memory
  • Compression set resistance
  • Enhanced abrasion and impact resistance
  • Chemical resistance to oils, fuels, & solvents

 

Can you name a few additional features that differentiate your polycaprolactone products offerings?

Our product line of Placcel® Polycaprolactone offers the following differentiated grades.

  • Placcel N series of narrow MW distribution diols
  • Placcel T series of very low acid value polyols
  • Placcel T and E series of highly hydrolytic resistance polyols
  • Placcel L series of liquid higher MW polyols
  • Placcel K eco-friendly series which do not contain tin

 

 

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