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Title: Site selective modification of cellulose nanocrystals with isocyanate for adhesion applications

Source: Proceedings of the 40th Annual Meeting of the Adhesion Society. St. Petersburg, FL. 3 p.

Author(s)Girouard, Natalie; Schueneman, Greg; Shofner, Meisha; Meredith, Carson

Publication Year: 2017  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4707-3B

Abstract: Polyurethanes and related materials such as urethaneureas, are important and versatile in achieving adhesion in a variety of applications including coatings, sealants, and structural adhesives. This talk will review recent work in incorporating cellulosic nanomaterials into urethane-based materials through attachment of an isocyanate moiety onto the surface of cellulose nanocrystals (CNCs). Previous studies of isocyanate-modified CNCs have used hexamethylene diisocyanate or methylene diisocyanate, and generally have resulted in direct chain extension of the CNCs prior to introduction into a polyol matrix. This is undesirable as it leads to aggregation of CNCs prior to formation of a composite within a urethane framework. The procedure outlined in this talk provides a route to functionalize CNCs with isocyanate prior to their covalent addition to the polymer matrix.

Isophorone diisocyanate (IPDI) is part of a class of aliphatic isocyanates used in polyurethanes, and are well-known for resistance to abrasion and UV degradation. The unequal reactivity of the two isocyanate groups in IPDI monomer was exploited to yield modified cellulose nanocrystals (CNCs) that retain an unreacted isocyanate functionality. The modified CNCs showed improvements in the onset of thermal degradation by 35°C compared to the unmodified CNCs. Polyurethane composites based on IPDI-modified CNCs and a trifunctional polyether alcohol were synthesized and compared to those using unmodified CNCs. CNC dispersion was superior when the modified CNCs were utilized, and resulted in transparent composites at loadings of up to 5% CNC with increases in the tensile strength and work of fracture of over 200% compared to the neat matrix.

Keywords: Cellulose nanocrystals; Surface modification; Adhesives

Publication Review Process: Non-Refereed (Other)

File size: 169 kb(s)

Date posted: 04/25/2017
RITS Product ID: 84582
Current FPL Scientist associated with this product
Schueneman, Gregory
Supervisory Research Materials Engineer
  

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