Urethane-silica functionalized graphene oxide for enhancing mechanical property and fire safety of waterborne polyurethane composites

Du, Wei; Jin, Yong; Lai, Shuangquan; Shi, Liangjie; Shen, Yichao; Pan, Jiezhou

doi:10.1016/j.apsusc.2019.06.227

Cited by 34 publications

(22 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is shown that the Tg s values obtained from DMA are little higher than the Tg s obtained from DSC. This is due to DMA determines the change in mechanical relaxation of the polymer chains, while DSC determines the heat capacity change from frozen to un‐frozen state 62 . The Tg a of the P1, P2, P3 and P4 are 24.1, 39.4, 30.5, and 29.3°C, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…This is due to DMA determines the change in mechanical relaxation of the polymer chains, while DSC determines the heat capacity change from frozen to un-frozen state. 62 The Tg a of the P1, P2, P3 and P4 are 24.1, 39.4, 30. influence on the Tg a and Tg p of PUAs but little on Tg s , corresponding to the DSC results. The tensile strength and elongation at break of the PUA and composite films were analyzed by electronic universal testing machine, as shown in Figure 6(d).…”

Section: Thermal Analysis Of the Filmsmentioning

confidence: 99%

See 1 more Smart Citation

Functional nano‐fillers in waterborne polyurethane/acrylic composites and the thermal, mechanical, and dielectrical properties

Zhou

Song

Wang

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

Modification is mostly used to adjust and increase the performance of polymers by employing organic or inorganic fillers in composites. It is significant to investigate the functions of different fillers in polymer matrix. In this work, we prepared a series of composites by using polyurethane/acrylic dispersions as polymer matrix and nanofillers (cellulose nanocrystals, carbon nanotubes and aluminum oxide nanoparticles) as modifiers to study their micro-structure and applied performance. It is found that the different nanofillers can be dispersed in PUA homogenously, which are inclusive physically. Different nanofillers have a noticeable influence on the T g for the acrylate copolymers and the T g of the interphase between the acrylate and polyurethane. The CNTs significantly increases the elongation to 127.29%, and gives the highest dielectric response. We imply that the CNTs may be the most significant fillers to increase the mechanical and electrical properties.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Thermal Analysis Of the Filmsmentioning

confidence: 99%

Functional nano‐fillers in waterborne polyurethane/acrylic composites and the thermal, mechanical, and dielectrical properties

Zhou

Song

Wang

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…9 The formation of hydrogen bonds between urethane and acrylate groups resulted in the improvement of mechanical properties. Physical cross-linking agents and nanofillers, such as nanoclays, [16][17][18] nanofibers, 19,20 functionalized graphene oxides (FGO), [21][22][23] functionalized metal nanoparticles, [24][25][26][27][28] etc. were also preferred to be reinforcements.…”

Section: Introductionmentioning

confidence: 99%

Improvement of polyurethane film strength by H‐bonding crosslinking with hydroxylated melamine

Xing-ya

Xie

Chen

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

Due to the condensation reaction of hydroxylated melamine molecules is possible to take place in the whole pH range, especially in acidic water medium or at high temperature, losing its water solubility. In this work, freeze drying perfectly removes water at pretty low temperature, avoiding condensation reaction of hydroxylated melamine. Therefore, a hydroxylated melamine in solid form (MOH‐S) was prepared. It can be not only dissolved in water after storing for 180 days but also well dispersed in waterborne polyurethane emulsion. The addition of hydroxylated melamine significantly improves the tensile strength of polyurethane films by 170%. After soaking the films in water for 24 h, the tensile strength of WPU/30%MOH‐S film lost only 6%, but 34% loss for the neat. Fourier transform infrared spectroscopy peak fitting demonstrates that the H‐bonding degree of N─H in WPU/30%MOH‐S film is 20.72 that is much higher than 3.33 in neat WPU. This indicates that H‐bonding cross‐linked structure is formed between polyurethane chains and hydroxylated melamine molecules. This work provides an effective strategy for preparing stable hydroxylated melamine and enhancing the strength of polyurethane film.

show abstract

“…This method prevents volatilization or migration of the combustion inhibitor to the surface of the material [ 7 , 8 ]. The most popular and promising substances used in recent years to obtain polyurethanes with improved thermal stability and flame retardancy are metal compounds [ 5 , 9 , 10 ], melamine and its derivatives [ 11 ], boron compounds [ 12 ], polyhedral oligomeric silsesquioxanes [ 13 ], functionalized graphene oxide [ 14 , 15 ], expanded graphite [ 16 ], carbon nanotubes [ 17 ] and phosphorus-containing substances. Due to environmental and health aspects, some halogenated substances, e.g., brominated and chlorinated compounds, are excluded from use, despite their high effectiveness [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Novel Cast Polyurethanes Obtained by Using Reactive Phosphorus-Containing Polyol: Synthesis, Thermal Analysis and Combustion Behaviors

2021

View full text Add to dashboard Cite

Phosphorus-containing polyol applications in polyurethane synthesis can prevent volatilization of flame retardants and their migration on the surface of a material. In this work, novel cast polyurethanes were prepared by a one-step method with the use of different amounts of phosphorus-containing polyol, 4,4′–diphenylmethane diisocyanate and 1,4-butanediol. The chemical structure, thermal, physicochemical and mechanical properties and flame resistance of the prepared materials were investigated. The results obtained for cast flame-retarded polyurethanes were compared with cast polyurethane synthesized with commonly known polyether polyol. It has been shown that with an increasing amount of phosphorus content to polyurethane’s chemical structure, an increased flame resistance and char yield were found during combustion tests. Phosphorus polyol worked in both the condensed (reduced heat and mass exchange) and gas phase (inhibition of flame propagation during burning). The obtained materials contained phosphorus polyol, indicating higher thermal stability in an oxidative environment than an inert atmosphere.

show abstract

Urethane-silica functionalized graphene oxide for enhancing mechanical property and fire safety of waterborne polyurethane composites

Cited by 34 publications

References 46 publications

Functional nano‐fillers in waterborne polyurethane/acrylic composites and the thermal, mechanical, and dielectrical properties

Functional nano‐fillers in waterborne polyurethane/acrylic composites and the thermal, mechanical, and dielectrical properties

Improvement of polyurethane film strength by H‐bonding crosslinking with hydroxylated melamine

Novel Cast Polyurethanes Obtained by Using Reactive Phosphorus-Containing Polyol: Synthesis, Thermal Analysis and Combustion Behaviors

Contact Info

Product

Resources

About