Enhancing Mechanical Properties of Polyurethane with Cellulose Acetate as Chain Extender

Mustapha, Safarul; Andou, Yoshito

doi:10.1007/s12221-021-0789-0

Cited by 4 publications

(2 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cellulose acetate (CA) can be added to PCU for this purpose. It is a thermoplastic material produced by the esterification of cellulose and presents low toxicity, good thermal stability, good mechanical resistance, high flexibility and durability, chemical resistance, tailorable surface chemistry and great solubility in organic solvents 33–35 CA or other cellulose‐based compounds may act as chain extenders or crosslinking agents when added to PU‐based materials 36,37 . Their effect depends on factors such as the amount of CA added and the material's preparation stage when CA is added.…”

Section: Introductionmentioning

confidence: 99%

Development of polycarbonate urethane‐based materials with controlled diclofenac release for cartilage replacement

et al. 2022

View full text Add to dashboard Cite

Hydrogels are very promising human cartilage replacement materials since they are able to mimic its structure and properties. Besides, they can be used as platforms for drug delivery to reduce inflammatory postsurgical reactions. Polycarbonate urethane (PCU) has been used in orthopedic applications due to its long‐term biocompatibility and bio‐durability. In this work, PCU‐based hydrogels with the ability to release an anti‐inflammatory (diclofenac) were developed, for the first time, for such purpose. The materials were reinforced with different amounts of cellulose acetate (CA, 10%, 15%, and 25% w/w) or carbon nanotubes (CNT, 1% and 2% w/w) in order to improve their mechanical properties. Samples were characterized in terms of compressive and tensile mechanical behavior. It was found that 15% CA and 2% CNT reinforcement led to the best mechanical properties. Thus, these materials were further characterized in terms of morphology, wettability, and friction coefficient (CoF). Contrarily to CNTs, the addition of CA significantly increased the material's porosity. Both materials became more hydrophilic, and the CoF slightly increased for PCU + 15%CA. The materials were loaded by soaking with diclofenac, and drug release experiments were conducted. PCU, PCU + 15%CA and PCU + 2%CNT presented similar release profiles, being able to ensure a controlled release of DFN for at least 4 days. Finally, in vitro cytotoxicity tests using human chondrocytes were also performed and confirmed a high biocompatibility for the three studied materials.

show abstract

Section: Introductionmentioning

confidence: 99%

Development of polycarbonate urethane‐based materials with controlled diclofenac release for cartilage replacement

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Although blocked isocyanates are useful for their non-hazardous methods, the stability and environment-friendliness of polyurethane elastomers depends on the use of aromatic or aliphatic isocyanates and chain extenders like diols, triols and anddiamines [28]. Their recyclability and properties have been studied in a few cases [29].…”

Section: Introductionmentioning

confidence: 99%

Blocking and Deblocking of Diisocyanate to Synthesize Polyurethanes

et al. 2021

View full text Add to dashboard Cite

Diisocyanates, particularly toluene diisocyanate (TDI), are useful for the preparation of various polyurethanes with specific applications as leather-like materials, adhesives and insoles, etc. Blocking agents can be used for the operational simplicity and to reduce the hazards of TDI. In this paper, we reported the use of 3-(4-bromo-phenyl)-1H-pyrazole to block toluene diisocyanate (TDI). FTIR, NMR, thermogravimetric analysis, contact angle analysis and differential scanning calorimetry (DSC) were used for the characterization. The effectiveness of the blocking was confirmed by spectroscopic techniques. The DSC thermogram showed that blocked adducts deblock at 240 °C, causing the regeneration of TDI, and causing the diisocyanates to react with polyols of different molecular weights, forming polyurethanes. The characterization of the polyurethanes was performed by infrared spectroscopy, nuclear magnetic resonance spectroscopy, thermogravimetric analysis, differential scanning calorimetry and a contact angle study.

show abstract

Performance study and tunnel waterproofing application of polyurethane prepolymer prepared by prepolymer and acetone combination

Yang,

He,

Zhang

2023

mat express

View full text Add to dashboard Cite

Waterproof measures are an important guarantee to protect the tunnel structure and maintain its safe and reliable operation. With the continuous progress of science and technology, waterborne polyurethane (WPU) is widely used in various applications such as coatings and adhesives due to its excellent mechanical properties. With the presence of hydrophilic groups, it is necessary to chemically modify PU due to its reduced performance. The PU prepolymer was prepared using the prepolymer acetone combination method and was emulsified by the high gravity strengthening technology for a better synthetic process. The modified PU composite lotion (CL) was then prepared. When the acrylate content increased, the two parameters, i.e., the size and particle size distribution of PU CL, showed opposite trends. For instance, the size changed from 61.45 nm to 106.5 nm, and the particle size distribution index changed from 0.255 to 0.11. Furthermore, the compressive strength of the material is 13.7 Mpa. When the acrylate content gradually increases, the material tensile strength changes from 11.9 MPa to about 6.5 MPa, and the overall elongation at break remains within 200%–250%. In the actual test of tunnel waterproofing (TW), the water absorption rate of the modified polyurethane changes slightly and is generally kept in the range of 4%–4.5%. It has a good waterproof effect, providing a new method reference for PU CL modification and TW.

show abstract

Enhancing Mechanical Properties of Polyurethane with Cellulose Acetate as Chain Extender

Cited by 4 publications

References 43 publications

Development of polycarbonate urethane‐based materials with controlled diclofenac release for cartilage replacement

Development of polycarbonate urethane‐based materials with controlled diclofenac release for cartilage replacement

Blocking and Deblocking of Diisocyanate to Synthesize Polyurethanes

Performance study and tunnel waterproofing application of polyurethane prepolymer prepared by prepolymer and acetone combination

Contact Info

Product

Resources

About