Polyurethanes from modified castor oil and chitosan

Ramírez, Claudia; Andrade, Larissa Pires de; Uscátegui, Yomaira L.; Díaz, Luis Eduardo; Gómez-Tejedor, José A.; Vallés-Lluch, Ana; Valero, Manuel F.

doi:10.1177/0095244317729578

Cited by 11 publications

(5 citation statements)

References 36 publications

(74 reference statements)

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“…These results are comparable to those described by Zhang and coworkers, 87 indicating that alginate, and possibly chitosan, was incorporated to the surface 26 . The weight loss between 300 to 400°C is due to the degradation of the CH 2 OH group, 88 and the final degradation at about 600°C corresponds to the degradation of the glycoside ring 88,89 …”

Section: Resultssupporting

confidence: 88%

“…26 The weight loss between 300 to 400 C is due to the degradation of the CH 2 OH group, 88 and the final degradation at about 600 C corresponds to the degradation of the glycoside ring. 88,89 TTONIPU shows a low-temperature degradation peak (at 185.9 C) related to highly volatile compounds. The low thermal stability of TTO affected the thermal behavior of the modified film due to the high amount of TTO (20%) incorporated on the surface.…”

Section: Samplementioning

confidence: 99%

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Synthesis and surface modification of sunflower oil‐based non‐isocyanate polyurethane: Physicochemical and antibacterial properties

del Pilar Maya,

Torres,

Gartner

2024

J of Applied Polymer Sci

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In this work, non‐isocyanate polyurethane (NIPU) films are synthesized from sunflower oil (SFO) with the object of using a renewable resource and establishing a nonpolluting process. SFO also has the advantage of having a higher level of unsaturation than other commercial oils, which provides more reactive sites to be chemically modified. This feature enables a higher degree of conversion to the two monomers, cyclocarbonate, and polyamine‐polyol. NIPU is obtained from their mixture and further crosslinking at 90°C allows the films with suitable mechanical properties to be used in biomedical applications. However, NIPU does not show antibacterial activity, so the surface must be modified. Two methods are used: layer‐by‐layer coating of alginate‐chitosan, and immersion in tea tree oil (TTO), previously activating the surface with acrylic acid (AANIPU). Surface modifications are confirmed by increased hydrophilicity, thermochemical changes, and a drop in mechanical performance. TTO on NIPU films inhibits bacterial growth against S. aureus and E. Coli. NIPU and AANIPU can be accepted as noncytotoxic, while incorporation of the two agents can produce cytotoxicity. No previous reports of such modifications have been found on NIPU films, which appear as promising alternatives for biomedical applications.

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Section: Resultssupporting

confidence: 88%

Section: Samplementioning

confidence: 99%

Synthesis and surface modification of sunflower oil‐based non‐isocyanate polyurethane: Physicochemical and antibacterial properties

del Pilar Maya,

Torres,

Gartner

2024

J of Applied Polymer Sci

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“…Water enters the PU matrix. Chain scission takes place through hydrolysis, in which water molecules may facilitate the cleavage of some bonds such as urethane and esters [ 15 ]. As mentioned previously, this property is related to the swelling of water and hydrophilicity [ 16 ].…”

Section: Resultsmentioning

confidence: 99%

Surface Response Methodology-Based Mixture Design to Study the Influence of Polyol Blend Composition on Polyurethanes’ Properties

2018

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Polyurethanes are materials with a strong structure-property relationship. The goal of this research was to study the effect of a polyol blend composition of polyurethanes on its properties using a mixture design and setting mathematic models for each property. Water absorption, hydrolytic degradation, contact angle, tensile strength hardness and modulus were studied. Additionally, thermal stability was studied by thermogravimetric analysis. Area under the curve was used to evaluate the effect of polyol blend composition on thermal stability and kinetics of water absorption and hydrolytic degradation. Least squares were used to calculate the regression coefficients. Models for the properties were significant, and lack of fit was not (p < 0.05). Fit statistics suggest both good fitting and prediction. Water absorption, hydrolytic degradation and contact angle were mediated by the hydrophilic nature of the polyols. Tensile strength, modulus and hardness could be regulated by the PE content and the characteristics of polyols. Regression of DTG curves from thermal analysis showed improvement of thermal stability with the increase of PCL and PE. An ANOVA test of the model terms demonstrated that three component influences on bulk properties like water absorption, hydrolytic degradation, hardness, tensile strength and modulus. The PEG*PCL interaction influences on the contact angle, which is a surface property. Mixture design application allowed for an understanding of the structure-property relationship through mathematic models.

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“…Water enters the PU matrix. Chain scission takes place through hydrolysis, in which water molecules may facilitate the cleavage of some bonds such as urethane and esters [17]. As mentioned previously, this property is related to the swelling of water and hydrophilicity [18].…”

Section: Hydrophilicity and Hydrolytic Degradationmentioning

confidence: 93%

Surface Response Methodology-Based Mixture Design to Study the Influence of Polyol Blend Composition on Polyurethanes Properties

Morales-González¹,

Barrera²,

Valero³

2018

Preprint

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Polyurethanes are materials with a strong structure-property relationship. The goal of this research was to study the effect of a polyol blend composition of polyurethanes on its properties using a mixture design and setting mathematic models for each property. Water absorption, hydrolytic degradation, contact angle, tensile stretch, hardness and modulus were studied. Additionally, Thermal stability was studied by thermogravimetric analysis. Area under the curve was used to evaluate the effect of polyol blend composition on thermal stability and kinetics of water absorption and hydrolytic degradation. Least squares were used to calculate the regression coefficients. Models for the properties were significant, and lack of fit was not (P<0.05). Fit statistics suggest both good fitting and prediction. Water absorption, hydrolytic degradation and contact angle were mediated by the hydrophilic nature of the polyols. Tensile strength, modulus and hardness could be regulated by the molecular weight and hydroxyl index of the polyols. Regression of DTG curves from thermal analysis showed improvement of thermal stability with the increase of PCL and PE. An ANOVA test of the model terms demonstrated that three component effects on bulk properties like water absorption, hydrolytic degradation, hardness, tensile strength and modulus, and the PEG*PCL interaction with the contact angle, which is a surface property. Mixture design application allowed for an understanding of the structure-property relationship through mathematic models.     

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Polyurethanes from modified castor oil and chitosan

Cited by 11 publications

References 36 publications

Synthesis and surface modification of sunflower oil‐based non‐isocyanate polyurethane: Physicochemical and antibacterial properties

Synthesis and surface modification of sunflower oil‐based non‐isocyanate polyurethane: Physicochemical and antibacterial properties

Surface Response Methodology-Based Mixture Design to Study the Influence of Polyol Blend Composition on Polyurethanes’ Properties

Surface Response Methodology-Based Mixture Design to Study the Influence of Polyol Blend Composition on Polyurethanes Properties

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