Semi-interpenetrating network composites of poly(lactic acid) with cis -9-octadecenylamine modified cellulose-nanofibers from Areca catechu husk

Soman, Sumesh; Chacko, Asha; Prasad, Virendra

doi:10.1016/j.compscitech.2017.01.007

Cited by 35 publications

(10 citation statements)

References 46 publications

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“…However, if the partition coefficient was the only or most important factor, then HEM (log P = −0.32) should have presented the highest WS, and at least for BisGMA copolymerizations, the opposite was observed. This was possibly related to the formation of IPNs, as already explained, which, under certain conditions, can be more prone to solvation [50]. This allied with the low log P value, helps explain the high WS observed.…”

Section: Discussionsupporting

confidence: 58%

“…The materials with the greatest WS were also the ones to present the highest percent reductions in both YS and E. For DMAM, the drop in YS/E after water storage was 70%, while for HEM, the reduction was 91 and 99% for YS and E, respectively. DMAM still had the statistically highest WS/SL, likely also explained by the formation of interpenetrating networks [50].…”

Section: Discussionmentioning

confidence: 95%

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Use of (meth)acrylamides as alternative monomers in dental adhesive systems

et al. 2019

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Methacrylamides are proposed as components for dental adhesive systems with enhanced resistance to hydrolytic and enzymatic degradation. The specific objective of this study was to evaluate the polymerization kinetics, water sorption and solubility, pH-derived degradation and microtensile bond strength of various monofunctional acrylamides and meth(acrylamides) when copolymerized with dimethacrylates. Base monomers were added at 60 wt%, and included either BisGMA or UDMA. Monofunctional monomers were added at 40 wt%, including one (meth)acrylate as the control, two secondary methacrylamides and two tertiary acrylamides. DMPA (0.2 wt%) and DPI-PF6 (0.4 wt%)/BHT (0.1 wt%) were added as initiators/inhibitor. Polymerization kinetics wwere followed with near-IR spectroscopy in real time. Water sorption (WS) and solubility (SL) were measured following ISO 4049. Monomer degradation at different pH levels was assessed with 1 H-NMR. Microtensile bond strength (MTBS) was assessed in cariesfree human third molars 48 h and 3 weeks after restorations were placed using solvated BisGMAbased adhesives (40 vol% ethanol). Data were analyzed with one-way ANOVA/Tukey's test (α=0.05). As expected, rate of polymerization and final degree of conversion (DC) were higher for the acryl versions of each monomer, and decreased with increasing steric hindrance around the vinyl group for each molecule. In general, UDMA copolymerizations were more rapid and extensive than for BisGMA, but this was dependent upon the specific monofunctional monomer added. WS/SL were in general higher for the (meth)acrylamides compared to the (meth)acrylates, except for the tertiary acrylamide, which showed the lowest values. One of the secondary methacrylamides was significantly more stable than the methacrylate control, but the alpha substitutions decreased stability to degradation in acid pH. MTBS in general was higher for the (meth)acrylates. While for all materials the MTBS values at 3 weeks decreased in relation to the 24 h results, the tertiary acrylamide showed no reduction in bond strength. This study highlights the importance of steric and electronic factors when designing monomers for applications where rapid polymerizations are needed, especially when co-polymerizations with other base monomers are required to balance mechanical properties, as is the case with dental adhesives. The results of

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Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 95%

Use of (meth)acrylamides as alternative monomers in dental adhesive systems

et al. 2019

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“…This reasoning supports the lower Ws recorded for DEAA and its overall recorded better performance than HEAA and HEMA. Indeed, Dickens et al [48] concluded that logP is a good predictor of watersorption; it highlights the complexity of relationships between structure and properties of polymer networks [36,49].…”

Section: Discussionmentioning

confidence: 99%

Multiparameter evaluation of acrylamide HEMA alternative monomers in 2-step adhesives

et al. 2021

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Multiparameter evaluation of acrylamide HEMA alternative monomers in 2step adhesives ABSTRACT Objectives: As frequently added to adhesives, the mono-functional monomer 2-hydroxyethyl methacrylate (HEMA) acts as co-solvent and improves surface wetting. Nevertheless, HEMA promotes watersorption and hydrolysis at adhesive interfaces, affecting bond durability to dentin. This study investigated if two acrylamide co-monomer alternatives could replace HEMA in experimental adhesive-resin formulations as part of 3/2-step universal adhesives applied, respectively, in etch-andrinse (E&R) and self-etch (SE) bonding modes.Methods: Upon priming dentin with the 10-MDP-based Clearfil SE Bond 2' primer ('CSE2p'; Kuraray Noritake), three experimental adhesive resins, consisting of 50wt% Bis-GMA, 15wt% TEGDMA, and either 35wt% diethyl acrylamide ('DEAA'), hydroxyethyl acrylamide ('HEAA') or HEMA ('HEMA+'), were applied. The control HEMA-free adhesive resin contained 60wt% Bis-GMA and 40wt% TEGDMA ('HEMA-'). All adhesives were evaluated for 'immediate' and 'aged' micro-tensile bond strength (μTBS) to dentin upon, respectively, 1-week (1w) and 6-month (6m) water storage, TEM adhesive-dentin interfacial interaction, 24-hour and 6m three-point bending, contact-angle wetting, viscosity and watersorption.Results: Linear mixed-effects model statistics revealed significantly better bonding performance of the adhesives applied in E&R than SE mode, except for DEAA_1w, with the highest μTBSs recorded for DEAA and HEMA-applied in SE mode. In E&R mode, aging did not significantly reduce DEAA's μTBS.Best wetting on primed dentin was recorded for HEMA+, significantly better than DEAA, further HEAA and HEMA-, these directly related to their viscosity. HEAA absorbed significantly more water than all other adhesive-resin formulations. HEMA->DEAA>HEAA>HEMA+ was the significant order for 6m bending strength. Conclusions:The acrylamide co-monomer DEAA could replace HEMA, while HEAA not.Universal adhesives provide acidic aqueous single-solution blends of hydrophilic and hydrophobic components to achieve time-stable bonding to dentin (and enamel) following both main bonding modes [5, 6]. The mono-functional monomer 2-hydroxyethyl methacrylate (HEMA) is frequently added to many of today's commercial adhesives as an essential component. Thanks to its inherent hydrophilic nature, HEMA acts as co-solvent for other hydrophobic monomers that mix less good in water, hereby preventing phase separation between monomer ingredients and water [7]. In addition, HEMA promotes surface wetting and intra-substrate infiltration thanks to its small molecular size [8].Nevertheless, HEMA exhibits a noticeably low degree of polymerization conversion (DC) [9]. It holds water, present as basic ingredient in dental adhesives up to 40% [5,10], inside the adhesive, by which water is more difficult to remove by gentle air-blowing upon the adhesive's application. If water remains within the adhesive, it impairs polymerization. All these factors enhance the adhesive's solubility and...

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“…The obtained PLA/CNF nanocomposite not only had excellent flame-retardancy, but also gained a 24% increase in tensile strength. The surface modification of TOCN by cis-9-octadecenylamine (OA) was performed by Soman and co-workers for the reinforcement of PLA [ 242 ]. In this case, the authors carried out the peptidic coupling reaction between TOCN and OA by EDC/NHS.…”

Section: Polymer Nanocomposites Reinforced By Cnfmentioning

confidence: 99%

Recent Advances in Nanocellulose Composites with Polymers: A Guide for Choosing Partners and How to Incorporate Them

2018

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Abstract:In recent years, the research on nanocellulose composites with polymers has made significant contributions to the development of functional and sustainable materials. This review outlines the chemistry of the interaction between the nanocellulose and the polymer matrix, along with the extent of the reinforcement in their nanocomposites. In order to fabricate well-defined nanocomposites, the type of nanomaterial and the selection of the polymer matrix are always crucial from the viewpoint of polymer-filler compatibility for the desired reinforcement and specific application. In this review, recent articles on polymer/nanocellulose composites were taken into account to provide a clear understanding on how to use the surface functionalities of nanocellulose and to choose the polymer matrix in order to produce the nanocomposite. Here, we considered cellulose nanocrystal (CNC) and cellulose nanofiber (CNF) as the nanocellulosic materials. A brief discussion on their synthesis and properties was also incorporated. This review, overall, is a guide to help in designing polymer/nanocellulose composites through the utilization of nanocellulose properties and the selection of functional polymers, paving the way to specific polymer-filler interaction.

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Semi-interpenetrating network composites of poly(lactic acid) with cis -9-octadecenylamine modified cellulose-nanofibers from Areca catechu husk

Cited by 35 publications

References 46 publications

Use of (meth)acrylamides as alternative monomers in dental adhesive systems

Use of (meth)acrylamides as alternative monomers in dental adhesive systems

Multiparameter evaluation of acrylamide HEMA alternative monomers in 2-step adhesives

Recent Advances in Nanocellulose Composites with Polymers: A Guide for Choosing Partners and How to Incorporate Them

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