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The relative molar mass changes of HBP-NH2-modified PF resin were investigated by gel permeation chromatography (GPC). The effects of HBP-NH2 on the curing of PF resin were investigated by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The effect of HBP-NH2 on the structure of PF resin was also investigated by nuclear magnetic resonance carbon spectroscopy (13C-NMR). The test results show that the gel time of the modified PF resin was reduced by 32% and 51% at 110 \u00b0C and 130 \u00b0C, respectively. Meanwhile, the addition of HBP-NH2 increased the relative molar mass of PF resin. The bonding strength test showed that the bonding strength of modified PF resin increased by 22% after soaking in boiling water (93 \u00b0C \u00b1 2) for 3 h. The DSC and DMA analysis indicated that the curing peak temperature decreased from 137 \u00b0C to 102 \u00b0C, and the curing rate of the modified PF resin was also faster than that of the pure PF resin. The 13C-NMR results showed that HBP-NH2 in the PF resin reacted to produce a co-condensation structure. Finally, the possible reaction mechanism of HBP-NH2 for the modification of PF resin was given.<\/jats:p>","DOI":"10.3390\/ma16103620","type":"journal-article","created":{"date-parts":[[2023,5,10]],"date-time":"2023-05-10T01:57:51Z","timestamp":1683683871000},"page":"3620","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Effects of the Addition of Amino-Terminated Highly Branched Polyurea on Curing Properties of Phenol-Formaldehyde Resin"],"prefix":"10.3390","volume":"16","author":[{"given":"Shiguan","family":"Lian","sequence":"first","affiliation":[{"name":"Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Material, Ministry of Science and Technology, Southwest Forestry University, Kunming 650224, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Huali","family":"Lin","sequence":"additional","affiliation":[{"name":"Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Material, Ministry of Science and Technology, Southwest Forestry University, Kunming 650224, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenbin","family":"Zhang","sequence":"additional","affiliation":[{"name":"Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Material, Ministry of Science and Technology, Southwest Forestry University, Kunming 650224, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6502-6493","authenticated-orcid":false,"given":"Hong","family":"Lei","sequence":"additional","affiliation":[{"name":"College of Chemistry and Material Engineering, Zhejiang Agriculture and Forestry University, Hangzhou 311300, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ming","family":"Cao","sequence":"additional","affiliation":[{"name":"Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Material, Ministry of Science and Technology, Southwest Forestry University, Kunming 650224, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jianrong","family":"Mao","sequence":"additional","affiliation":[{"name":"Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Material, Ministry of Science and Technology, Southwest Forestry University, Kunming 650224, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0970-7964","authenticated-orcid":false,"given":"Taohong","family":"Li","sequence":"additional","affiliation":[{"name":"Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shi","family":"Chen","sequence":"additional","affiliation":[{"name":"Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Material, Ministry of Science and Technology, Southwest Forestry University, Kunming 650224, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Long","family":"Yang","sequence":"additional","affiliation":[{"name":"Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, China"},{"name":"International Joint Research Center for Biomass Material, Ministry of Science and Technology, Southwest Forestry University, Kunming 650224, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,5,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"28924","DOI":"10.1039\/C9RA06487G","article-title":"Research Status, Industrial Application Demand and Prospects of Phenolic Resin","volume":"9","author":"Xu","year":"2019","journal-title":"RSC Adv."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Pizzi, A., and Mittal, K.L. 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