Construction of sustainable polyurethane-based gel-coats containing poly( ε -caprolactone)-grafted lignin and their coating performance

Jang, Seunghyun; Kim, Dae-Hoon; Park, Dong Hyup; Kim, Oh Young; Hwang, Seok‐Ho

doi:10.1016/j.porgcoat.2018.04.008

Cited by 26 publications

(22 citation statements)

References 27 publications

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“…To reveal the reason for this phenomenon, we investigated the chemical compositions of the fabricated scaffolds ( Figure 4 b,c). The detection levels of C–O (1088) and C–O–C (1163) groups in the PCL/nHA-ZnO100 and PCL/nHA-ZnO200 scaffolds were decreased compared with those in the PCL/nHA and PCL/nHA-ZnO10 scaffolds [ 41 , 42 , 43 ]. Therefore, we could assume applying the zinc oxide coating by sputtering system broke the C–O (1088) and C–O–C (1163) groups in the PCL matrix.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Antibacterial Activity and Cell Response for 3D-Printed Polycaprolactone/Nanohydroxyapatite Scaffold with Zinc Oxide Coating

et al. 2020

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Among 3D-printed composite scaffolds for bone tissue engineering, researchers have been attracted to the use of zinc ions to improve the scaffold’s anti-bacterial activity and prevent surgical site infection. In this study, we assumed that the concentration of zinc ions released from the scaffold will be correlated with the thickness of the zinc oxide coating on 3D-printed scaffolds. We investigated the adequate thickness of zinc oxide coating by comparing different scaffolds’ characteristics, antibacterial activity, and in vitro cell response. The scaffolds’ compressive modulus decreased as the zinc oxide coating thickness increased (10, 100 and 200 nm). However, the compressive modulus of scaffolds in this study were superior to those of other reported scaffolds because our scaffolds had a kagome structure and were made of composite material. In regard to the antibacterial activity and in vitro cell response, the in vitro cell proliferation on scaffolds with a zinc oxide coating was higher than that of the control scaffold. Moreover, the antibacterial activity of scaffolds with 100 or 200 nm-thick zinc oxide coating on Escherichia coli was superior to that of other scaffolds. Therefore, we concluded that the scaffold with a 100 nm-thick zinc oxide coating was the most appropriate scaffold to use as a bone-regenerating scaffold, given its mechanical property, its antibacterial activity, and its in vitro cell proliferation.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the Antibacterial Activity and Cell Response for 3D-Printed Polycaprolactone/Nanohydroxyapatite Scaffold with Zinc Oxide Coating

et al. 2020

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“…Jang et al synthesized poly(ε-caprolactone) grafted lignin (PCL- g -lignin) via ring-opening polymerization of ε-caprolactone in the presence of organosolv lignin. The PCL- g -lignin and acrylic polyol were mixed with NCO-terminated polyethylene glycol to produce PU-based gel-coated films [ 23 ]. As the content of PCL- g -lignin increased to 35 wt%, the surface characteristics of the films, such as adhesion strength, abrasion and gloss, remained relatively constant, but the tensile strength and hardness of the films decreased, and elongation at break increased due to the reduction in crosslinking density.…”

Section: Covalent Incorporation Of Functionalized Ligninmentioning

confidence: 99%

Recent Advances in the Application of Functionalized Lignin in Value-Added Polymeric Materials

Wang

Meng

et al. 2020

Polymers

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The quest for converting lignin into high-value products has been continuously pursued in the past few decades. In its native form, lignin is a group of heterogeneous polymers comprised of phenylpropanoids. The major commercial lignin streams, including Kraft lignin, lignosulfonates, soda lignin and organosolv lignin, are produced from industrial processes including the paper and pulping industry and emerging lignocellulosic biorefineries. Although lignin has been viewed as a low-cost and renewable feedstock to replace petroleum-based materials, its utilization in polymeric materials has been suppressed due to the low reactivity and inherent physicochemical properties of lignin. Hence, various lignin modification strategies have been developed to overcome these problems. Herein, we review recent progress made in the utilization of functionalized lignins in commodity polymers including thermoset resins, blends/composites, grafted functionalized copolymers and carbon fiber precursors. In the synthesis of thermoset resins such as polyurethane, phenol-formaldehyde and epoxy, they are covalently incorporated into the polymer matrix, and the discussion is focused on chemical modifications improving the reactivity of technical lignins. In blends/composites, functionalization of technical lignins is based upon tuning the intermolecular forces between polymer components. In addition, grafted functional polymers have expanded the utilization of lignin-based copolymers to biomedical materials and value-added additives. Different modification approaches have also been applied to facilitate the application of lignin as carbon fiber precursors, heavy metal adsorbents and nanoparticles. These emerging fields will create new opportunities in cost-effectively integrating the lignin valorization into lignocellulosic biorefineries.

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“…Since their discovery in 1930 by Otto Bayer [1], polyurethanes (PU)s production and use keep growing interest. Various physical aspects of PU materials have been investigated including coatings [2,3], adhesives [4,5], rigid or soft foams [6][7][8] and thermosets [9]. Based on the alcohol-isocyanate reaction, a well-understanding relationship between the structure of the precursors (mainly polyether polyol or polyester polyol [10][11][12]) and the properties of the resulting materials has already been established [13,14].…”

Section: Introductionmentioning

confidence: 99%

Polyurethane Thermosets Using Lipidic Poly(α‐Hydroxyketone)

Briou

Caillol

et al. 2019

J Americ Oil Chem Soc

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Lipidic polyols based on -hydroxyketone reactive groups were investigated for polyurethane thermosets. The reactivity of this peculiar secondary alcohol group in triglyceride structure was compared, without use of catalyst, to that of poly(1,2-diol)triglyceride and castor oil to demonstrate the influence of ketone in  position of alcohol group in presence of HDMI for urethanisation rate. The kinetic effect of ketone group was also studied on various lipidic architectures: mono(-hydroxyketone) ester, di(-hydroxyketone) diester and tri(hydroxyketone) triglyceride. The presence of hydrogen bonds in the network coming from urethane, residual alcohol and ketone in hard segments of PU was discussed and correlated to the thermal stability and the soft mechanical properties of the resulting polyurethane thermosets.

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Construction of sustainable polyurethane-based gel-coats containing poly( ε -caprolactone)-grafted lignin and their coating performance

Cited by 26 publications

References 27 publications

Evaluation of the Antibacterial Activity and Cell Response for 3D-Printed Polycaprolactone/Nanohydroxyapatite Scaffold with Zinc Oxide Coating

Evaluation of the Antibacterial Activity and Cell Response for 3D-Printed Polycaprolactone/Nanohydroxyapatite Scaffold with Zinc Oxide Coating

Recent Advances in the Application of Functionalized Lignin in Value-Added Polymeric Materials

Polyurethane Thermosets Using Lipidic Poly(α‐Hydroxyketone)

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