{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,7]],"date-time":"2026-02-07T20:14:09Z","timestamp":1770495249933,"version":"3.49.0"},"reference-count":31,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2022,9,16]],"date-time":"2022-09-16T00:00:00Z","timestamp":1663286400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Forestry Department of Fujian Province","award":["2018-26"],"award-info":[{"award-number":["2018-26"]}]},{"name":"Forestry Department of Fujian Province","award":["31971593"],"award-info":[{"award-number":["31971593"]}]},{"name":"Forestry Department of Fujian Province","award":["32071688"],"award-info":[{"award-number":["32071688"]}]},{"name":"Forestry Department of Fujian Province","award":["CXZX2019111S"],"award-info":[{"award-number":["CXZX2019111S"]}]},{"name":"National Natural Science Foundation of China","award":["2018-26"],"award-info":[{"award-number":["2018-26"]}]},{"name":"National Natural Science Foundation of China","award":["31971593"],"award-info":[{"award-number":["31971593"]}]},{"name":"National Natural Science Foundation of China","award":["32071688"],"award-info":[{"award-number":["32071688"]}]},{"name":"National Natural Science Foundation of China","award":["CXZX2019111S"],"award-info":[{"award-number":["CXZX2019111S"]}]},{"name":"Fujian Agriculture and Forestry University","award":["2018-26"],"award-info":[{"award-number":["2018-26"]}]},{"name":"Fujian Agriculture and Forestry University","award":["31971593"],"award-info":[{"award-number":["31971593"]}]},{"name":"Fujian Agriculture and Forestry University","award":["32071688"],"award-info":[{"award-number":["32071688"]}]},{"name":"Fujian Agriculture and Forestry University","award":["CXZX2019111S"],"award-info":[{"award-number":["CXZX2019111S"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Fast-growing Chinese fir wood has shortfalls such as loose structure and low strength because it grows faster than natural trees. Resin impregnation is a great way to increase the strength of fast-growing fir. However, the resin used for impregnation is a kind of urea-formaldehyde resin, phenolic formaldehyde resin, melamine formaldehyde resin, and the like, which introduce harmful substances such as formaldehyde or phenolic into the wood. In this paper, Chinese fir wood was impregnated with natural shellac polymer, and the effects of impregnation variables on the mechanical properties of the wood were examined. The increase in strength in compression perpendicular to grain (SCPG) of wood samples impregnated with 15% shellac solution achieved a maximum value of 39.01%, but the modulus of rupture (MOR) was slightly reduced. The effects of the impregnation pressure, time, and their interaction were investigated by the response surface method (RSM). ANOVA analysis revealed that the impregnation pressure and time and the interaction between the two seemed to have a significant effect on \u2206SCPG. Based on the response face model, the corresponding optimal parameters obtained are 1.0 MPa and 16.0 min for impregnation pressure and time, respectively. By impregnating fir wood with the above optimal conditions, the SCPG increased by 85.78%, whereas the MOR decreased by the least amount.<\/jats:p>","DOI":"10.3390\/polym14183871","type":"journal-article","created":{"date-parts":[[2022,9,19]],"date-time":"2022-09-19T04:49:22Z","timestamp":1663562962000},"page":"3871","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Effect of Impregnation with Natural Shellac Polymer on the Mechanical Properties of Fast-Growing Chinese Fir"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4045-806X","authenticated-orcid":false,"given":"Qinzhi","family":"Zeng","sequence":"first","affiliation":[{"name":"College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China"},{"name":"National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, Fuzhou 350002, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiya","family":"Yu","sequence":"additional","affiliation":[{"name":"College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nianfeng","family":"Wei","sequence":"additional","affiliation":[{"name":"Fujian Provincial Forestry Survey and Design Institute, Fuzhou 350001, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhiyong","family":"Wu","sequence":"additional","affiliation":[{"name":"Fujian Provincial Forestry Survey and Design Institute, Fuzhou 350001, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qisong","family":"Liu","sequence":"additional","affiliation":[{"name":"Fujian Provincial Forestry Survey and Design Institute, Fuzhou 350001, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nairong","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China"},{"name":"National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, Fuzhou 350002, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Weigang","family":"Zhao","sequence":"additional","affiliation":[{"name":"College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China"},{"name":"National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, Fuzhou 350002, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,9,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"101393","DOI":"10.1016\/j.ecoinf.2021.101393","article-title":"Predicting potential suitable habitats of Chinese fir under current and future climatic scenarios based on Maxent model","volume":"64","author":"Zhao","year":"2021","journal-title":"Ecol. Inform."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1087","DOI":"10.1007\/s10722-016-0428-6","article-title":"Genetic diversity and relationships of ancient Chinese fir (Cunninghamia lanceolata) genotypes revealed by sequence-related amplified polymorphism markers","volume":"64","author":"Li","year":"2017","journal-title":"Genet. Resour. Crop Evol."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"973","DOI":"10.1007\/s10021-019-00450-1","article-title":"Soil Phosphorus Bioavailability and Recycling Increased with Stand Age in Chinese Fir Plantations","volume":"23","author":"Wu","year":"2020","journal-title":"Ecosystems"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"4664","DOI":"10.1038\/s41598-021-83500-w","article-title":"Variation in wood physical properties and effects of climate for different geographic sources of Chinese fir in subtropical area of China","volume":"11","author":"You","year":"2021","journal-title":"Sci. Rep."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"113656","DOI":"10.1016\/j.indcrop.2021.113656","article-title":"Comparative metabolomics analysis reveals the color variation between heartwood and sapwood of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook","volume":"169","author":"Yang","year":"2021","journal-title":"Ind. Crops Prod."},{"key":"ref_6","first-page":"103","article-title":"Chemical Characteristics of Heartwood and Sapwood of Red-Heart Chinese Fir (Cunninghamia lanceolata)","volume":"69","author":"Li","year":"2019","journal-title":"For. Prod. J."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"126960","DOI":"10.1016\/j.conbuildmat.2022.126960","article-title":"Effects of the combination of compression and impregnation with phenolic resin on the dimensional stability in the multiscale wood structure of Chinese fir","volume":"327","author":"Wang","year":"2022","journal-title":"Constr. Build. Mater."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Spear, M.J., Curling, S.F., Dimitriou, A., and Ormondroyd, G.A. (2021). Review of Functional Treatments for Modified Wood. Coatings, 11.","DOI":"10.3390\/coatings11030327"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Zhou, T., and Liu, H. (2022). Research Progress of Wood Cell Wall Modification and Functional Improvement: A Review. Materials, 15.","DOI":"10.3390\/ma15041598"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"953","DOI":"10.1007\/s00226-011-0456-5","article-title":"Influence of temperature and steam environment on set recovery of compressive deformation of wood","volume":"46","author":"Kutnar","year":"2012","journal-title":"Wood Sci. Technol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"679","DOI":"10.1007\/s00226-009-0291-0","article-title":"Properties and set-recovery of surface densified Norway spruce and European beech","volume":"44","author":"Rautkari","year":"2010","journal-title":"Wood Sci. Technol."},{"key":"ref_12","first-page":"5279","article-title":"Optimization of the Combined Modification Process of Thermo-Mechanical Densification and Heat Treatment on Chinese Fir Wood","volume":"8","author":"Li","year":"2013","journal-title":"BioResources"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"895","DOI":"10.3832\/ifor2380-010","article-title":"Wood modification technologies\u2014A review","volume":"10","author":"Sandberg","year":"2017","journal-title":"iForest-BioGeosci. For."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"272","DOI":"10.15376\/biores.8.1.272-282","article-title":"Effect of Modification with Phenol Formaldehyde Resin on the Mechanical Properties of Wood from Chinese Fir","volume":"8","author":"Huang","year":"2012","journal-title":"BioResources"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"118101","DOI":"10.1016\/j.conbuildmat.2020.118101","article-title":"Use impregnation and densification to improve mechanical properties and combustion performance of Chinese fir","volume":"241","author":"Yue","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"39860","DOI":"10.1002\/app.39860","article-title":"Drying and curing behaviour of melamine formaldehyde resin impregnated papers","volume":"131","author":"Kohlmayr","year":"2014","journal-title":"J. Appl. Polym. Sci."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"104","DOI":"10.1007\/s11461-007-0017-0","article-title":"Improvement of wood properties by urea-formaldehyde resin and nano-SiO2","volume":"2","author":"Shi","year":"2007","journal-title":"Front. For. China"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"2195","DOI":"10.15376\/biores.15.2.2195-2211","article-title":"Low viscosity melamine urea formaldehyde resin as a bulking agent in reducing formaldehyde emission of treated wood","volume":"15","author":"Ali","year":"2020","journal-title":"Bioresources"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"543","DOI":"10.1016\/j.rinp.2016.08.017","article-title":"Modification of fast-growing Chinese Fir wood with unsaturated polyester resin: Impregnation technology and efficiency","volume":"6","author":"Ma","year":"2016","journal-title":"Results Phys."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"217","DOI":"10.1080\/17480272.2014.971428","article-title":"Effects of impregnation and heat treatment on the physical and mechanical properties of Scots pine (Pinus sylvestris) wood","volume":"11","author":"Lahtela","year":"2016","journal-title":"Wood Mater. Sci. Eng."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1043","DOI":"10.1016\/j.jmrt.2019.10.035","article-title":"Preparation and characterization of sodium silicate impregnated Chinese fir wood with high strength, water resistance, flame retardant and smoke suppression","volume":"9","author":"Li","year":"2020","journal-title":"J. Mater. Res. Technol."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"126","DOI":"10.1515\/hf-2020-0016","article-title":"Comparison of silicate impregnation methods to reinforce Chinese fir wood","volume":"75","author":"Li","year":"2021","journal-title":"Holzforschung"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"106328","DOI":"10.1016\/j.porgcoat.2021.106328","article-title":"The unique nanostructure of shellac films","volume":"157","author":"Bar","year":"2021","journal-title":"Prog. Org. Coat."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Liu, M., Xu, G., Wang, J., Tu, X., Liu, X., Wu, Z., Lv, J., and Xu, W. (2020). Effects of Shellac Treatment on Wood Hygroscopicity, Dimensional Stability and Thermostability. Coatings, 10.","DOI":"10.3390\/coatings10090881"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1058","DOI":"10.1007\/s00339-016-0577-7","article-title":"Shellac\/nanoparticles dispersions as protective materials for wood","volume":"122","author":"Weththimuni","year":"2016","journal-title":"Appl. Phys. A"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"2041","DOI":"10.32604\/jrm.2022.018027","article-title":"Study on Microwave Pretreatment Technology to Improve the Effect of Shellac Impregnation of Fast-Growing Chinese Fir","volume":"10","author":"Yu","year":"2021","journal-title":"J. Renew. Mater."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1186\/1754-6834-3-10","article-title":"Cellulose crystallinity index: Measurement techniques and their impact on interpreting cellulase performance","volume":"3","author":"Park","year":"2010","journal-title":"Biotechnol. Biofuels"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"113022","DOI":"10.1016\/j.indcrop.2020.113022","article-title":"From wood pulp fibers to tubular SiO2\/C composite as anode for Li-ion battery: In-situ regulation of cellulose microfibrils by alkali solution","volume":"158","author":"Wang","year":"2020","journal-title":"Ind. Crops Prod."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"131957","DOI":"10.1016\/j.jclepro.2022.131957","article-title":"Development and performance evaluation of wood-pulp\/glass fibre hybrid composites as core materials for vacuum insulation panels","volume":"357","author":"Zhao","year":"2022","journal-title":"J. Clean. Prod."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"123367","DOI":"10.1016\/j.energy.2022.123367","article-title":"Controlled preparation of nitrogen-doped hierarchical carbon cryogels derived from Phenolic-Based resin and their CO2 adsorption properties","volume":"246","author":"Zhou","year":"2022","journal-title":"Energy"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"760","DOI":"10.1016\/j.renene.2021.05.006","article-title":"High energy density supercapacitors with hierarchical nitrogen-doped porous carbon as active material obtained from bio-waste","volume":"175","author":"Chen","year":"2021","journal-title":"Renew. Energy"}],"container-title":["Polymers"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-4360\/14\/18\/3871\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T00:32:49Z","timestamp":1760142769000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-4360\/14\/18\/3871"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,9,16]]},"references-count":31,"journal-issue":{"issue":"18","published-online":{"date-parts":[[2022,9]]}},"alternative-id":["polym14183871"],"URL":"https:\/\/doi.org\/10.3390\/polym14183871","relation":{},"ISSN":["2073-4360"],"issn-type":[{"value":"2073-4360","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,9,16]]}}}