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The influence of phenol and formaldehyde to PEG mass ratio ((P\u2009+\u2009F)\/PEG) on the hydroxyl number of PF-PEGs and mechanical properties, thermal stabilities, crystallization behaviors, as well as microstructure of polyurethane composite films were studied using chemical analysis, mechanical tests, thermogravimetric analyses (TGA), dynamic mechanical analyses (DMA), X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM and TEM), respectively. Results demonstrated that PF-PEGs with (P\u2009+\u2009F)\/PEG of 50\/50 had the highest hydroxyl number of 323\u2009mg\u2009K(OH)\/g. The incorporation of phenol and formaldehyde into PEG improved the mechanical properties of polyurethane films, glass transition temperature (<jats:italic>T<\/jats:italic><jats:sub>g<\/jats:sub>), and thermal properties but resulted in the brittleness characteristic of the composite films and low crystallization properties. Moreover, the synthesis mechanism of PF-PEGs polyurethane composite films was revealed, which would provide a theoretical base for the preparation of the rigid polyurethane foams based on phenolic resins.<\/jats:p>","DOI":"10.1038\/s41598-019-56147-x","type":"journal-article","created":{"date-parts":[[2019,12,20]],"date-time":"2019-12-20T11:03:02Z","timestamp":1576839782000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Synthesis and characterization of polyethylene glycol-phenol-formaldehyde based polyurethane composite"],"prefix":"10.1038","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5957-1762","authenticated-orcid":false,"given":"Juan","family":"Liu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"RiQing","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"ChunPeng","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"YongJun","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"FuXiang","family":"Chu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,12,20]]},"reference":[{"key":"56147_CR1","doi-asserted-by":"publisher","first-page":"86","DOI":"10.1016\/j.polymer.2018.12.050","volume":"164","author":"C Mougel","year":"2019","unstructured":"Mougel, C., Garnier, T., Cassagnau, P. & Sintes-Zydowicz, N. 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