Insights into the development of crystallinity in liquid urea-formaldehyde resins

Nuryawan, Arif; Singh, Adya P.; Zanetti, Michela; Park, Byung‐Dae; Causin, Valerio

doi:10.1016/j.ijadhadh.2016.10.004

Cited by 30 publications

(32 citation statements)

References 25 publications

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“…Generally, it is acknowledged that the crystallization is the ordered array of molecules and cross-linking will lead to its crystallinity reduction for the adhesive system 7 . However, this result clearly indicated that the crystallinity in STP adhesives was not associated with the usual cross-linking modification, but developed with the formation of amorphous network for SPI chains 47 . Most importantly, with the integration of TAPI, SPI segments were favorably re-arranged closely and orderly together, and more crystalline domain (including the crystallization of TAPI itself) interpenetrated into the STP adhesives 41 .…”

Section: Resultsmentioning

confidence: 84%

The synergy between natural polyphenol-inspired catechol moieties and plant protein-derived bio-adhesive enhances the wet bonding strength

Zhong

Zhao

Song

et al. 2017

Sci Rep

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Novel soybean meal-based biomimetic (STP) adhesives were fabricated via soybean meal (SM) and enhanced by tannic acid (TA) and polyetheylenimine (PEI) (TAPI) co-crosslinking network based on natural polyphenol-inspired chemistry. The multiple physico-chemical interactions (including intermolecular H-bonding and covalent bonding) between the TAPI co-crosslinking system and SM matrices were examined by the Fourier transform infrared spectroscopy, solid-state 13C nuclear magnetic resonance, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy. The results showed that a dense, robust, and water-resistant adhesive layer was constructed between network-bound catechol moieties in the TAPI and SM system, endowing the STP adhesive with high wet bonding strength for plywood. As expected, TAPI-modified SM adhesives showed a 156.1% increase in wet bonding strength compared to the control SM adhesive. The adhesion meets standard requirements for interior-use plywood. Both the solid content and residual mass analysis also confirmed that the enhancement in the STP adhesive was attributable to the network crosslinking density and stiffness after integrating the TAPI system. Moreover, the thermal stability of the resultant STP adhesive exhibited a significant improvement. The proposed STP adhesive may be a promising cost-effective and wet-resistant bio-adhesive for the application in the wood composites industry.

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Section: Resultsmentioning

confidence: 84%

The synergy between natural polyphenol-inspired catechol moieties and plant protein-derived bio-adhesive enhances the wet bonding strength

Zhong

Zhao

Song

et al. 2017

Sci Rep

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“…The results might not be appropriate to determine the crystalline structures of the resin sample. 12 The clearest image here showed a scale bar of 500 nm, which is impossible to observe the atom level distances between the planes of a crystal. To conrm the crystalline structure of an analyte, the most reliable way is to obtain its electron diffraction pattern.…”

Section: Introductionmentioning

confidence: 75%

“…The results indicate that acid and hardener types for pH value control during resin preparation and resin curing, respectively, did not inuence the formation and the development of the crystalline structures in cured UF resins. 12 The higher intensity in type "b" resin at 2q degrees of 21.55 and 24.35 might be attributed to a higher population of the related crystalline regions. This indicates that the types of hardener and acid could control the percentage of crystalline regions in cured UF resins even at the same F/U molar ratio.…”

Section: Xrd Pattern Of Cured Uf Resinmentioning

confidence: 98%

Characterization of the crystalline regions of cured urea formaldehyde resin

2017

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“…Fortunately, there is possible interaction between hydroxyl groups of cellulose and methylol groups from UF resin that results in improvement of ductility of the adhesive (Fornué et al, 2011). The formation of various morphologies and size of crystalline region regarded as polycrystals in the UF resin adhesives especially at low formaldehyde/urea (F/U), i.e., 0.9 to 1.0 had been reported by Park and Causin (2013) ;Singh A. P. et al (2014), andNuryawan et al (2017). Singh et al studied the pattern of cured UF resin in contact with and without wood (Singh A. P. et al, 2014).…”

Section: Nanocellulose In Wood Adhesivesmentioning

confidence: 99%

Nanocellulose: From Fundamentals to Advanced Applications

et al. 2020

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Over the past few years, nanocellulose (NC), cellulose in the form of nanostructures, has been proved to be one of the most prominent green materials of modern times. NC materials have gained growing interests owing to their attractive and excellent characteristics such as abundance, high aspect ratio, better mechanical properties, renewability, and biocompatibility. The abundant hydroxyl functional groups allow a wide range of functionalizations via chemical reactions, leading to developing various materials with tunable features. In this review, recent advances in the preparation, modification, and emerging application of nanocellulose, especially cellulose nanocrystals (CNCs), are described and discussed based on the analysis of the latest investigations (particularly for the reports of the past 3 years). We start with a concise background of cellulose, its structural organization as well as the nomenclature of cellulose nanomaterials for beginners in this field. Then, different experimental procedures for the production of nanocelluloses, their properties, and functionalization approaches were elaborated. Furthermore, a number of recent and emerging uses of nanocellulose in nanocomposites, Pickering emulsifiers, wood adhesives, wastewater treatment, as well as in new evolving biomedical applications are presented. Finally, the challenges and opportunities of NC-based emerging materials are discussed.

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Insights into the development of crystallinity in liquid urea-formaldehyde resins

Cited by 30 publications

References 25 publications

The synergy between natural polyphenol-inspired catechol moieties and plant protein-derived bio-adhesive enhances the wet bonding strength

The synergy between natural polyphenol-inspired catechol moieties and plant protein-derived bio-adhesive enhances the wet bonding strength

Characterization of the crystalline regions of cured urea formaldehyde resin

Nanocellulose: From Fundamentals to Advanced Applications

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