We advise that you perform an Anywhere search in the library catalogue for “polyethylene glycol” using the quotation marks for phrase searching. The book Poly(ethylene oxide) by Bailey reveals that polyethylene glycol is a commonly used name for the polymer Poly(ethylene oxide) and is usually applied for those formulations with a lower molecular weight. It also contains a table of the melting points of common polyethylene glycols.
Another resource for polymer melting points is the Polymer Handbook by Brandrup. Section 6 contains a range of melting points for Polyethylene oxides of various molecular rates.