Shape memory effect and mechanical properties of cyanate ester-polybutadiene epoxy copolymer

Wang, Kun; Zhu, Guangming; Niu, Lei; Wang, Yongkun; Liu, Zhe

doi:10.1007/s10965-014-0385-8

Cited by 15 publications

(6 citation statements)

References 27 publications

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“…Because of introducing hydrophilic PEG, the hydrophilic of polyurethane foams get improved. Consistent with water uptake data, water contact angle revealed that all samples showed good wetting properties which emphasized hydrophilicity behavior of PUCO, probably attribute to the hydrophilicity of PEG component [33,44]. Differences in the values of contact angles and water uptakes of various polyurethane foams maybe due to the change in NCO/OH ratio.…”

Section: Water Uptake Of Foams and Contact Angle Studysupporting

confidence: 69%

Synthesis of bio-castor oil polyurethane flexible foams and the influence of biotic component on their performance

et al. 2015

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A series of bio-based polyurethane flexible foams were synthesized by substituting polyether polyol with castor oil and polyethylene glycol (PEG). The influence of the castor oil component in the prepolymers on the structure and properties of the castor oil-based polyurethane flexible foams were investigated and compared. FTIR (Fourier transform infrared spectroscopy) results confirmed that bio-based polyurethane was successfully synthesized by castor oil, PEG and MDI (diphenyl methane diisocyanate), and its urethane group content decreased as the castor oil content increased from 40 to 60 wt.%. TG (thermogravimetry) and DTG (derivative thermogravimetry) results showed that the thermal degradation of the bio-based polyurethane flexible foams occurred at about 150, 320 and 420°C. The Young's modulus improved from 0.196 to 1.235 KPa and the compression resilience improved from 97.76 to 99.65 % with increased content of castor oil. Moreover, these bio-based foams exhibited lower water absorption and higher contact angle with increased castor oil content.

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Section: Water Uptake Of Foams and Contact Angle Studysupporting

confidence: 69%

Synthesis of bio-castor oil polyurethane flexible foams and the influence of biotic component on their performance

et al. 2015

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“…Therefore, the crystalline domains act as the scaffold, and the deformation of the polymer takes place in the amorphous state. [ 58 ] The difference between these samples clearly indicates that the shape memory behavior strongly depends on the presence of crystallites in the thermosets. By changing the concentration of the PEG and the cross‐linking density of the thermosets can be controlled shape memory behavior.…”

Section: Resultsmentioning

confidence: 99%

The effect molecular weight of polyol components on shape memory effect of epoxy‐polyurethane composites

Bratasyuk

Zuev

2021

Polymer Engineering & Sci

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This paper describes the experimental findings of the study of a series of PU/epoxy composites, which formed interpenetrating networks and have shape‐memory properties. The morphological variation for different chemical compositions and the influences of morphology on mechanical performance and shape‐memory behavior are discussed. Length and mass fraction of polyethylene glycol (PEG) units are chosen as the key parameters in this study. The molecular weight of PEG was varied from 400 (as such PEG units are unable to crystallize) to 1500, 4000, and 6000, which are crystallizable. It was shown that the crystallization of PEG units is the key parameter, which determines the mechanical performance and shape‐memory behavior of PU/epoxy composites in this study. DMTA results show the linear dependence of glass transition temperature and tensile strength, elongation, and other mechanical parameters on the amount of PEG in PU/epoxy composites independently of the amount of PEG unit lengths. The maximal value of shape fixation rate was achieved for 30–40 mass percentage of PEG 4000 (4.5 × 10−2 s−1 at Tg + 20°C) or PEG 6000(4.1 × 10−2 s−1 at Tg + 20°C) in PU/epoxy composites.

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“…It was reported that if the glass storage modulus of any polymer is more than two times the rubbery storage modulus, then that polymer possesses excellent shape memory characteristics . On the basis of this theoretical consideration, Wang et al , and Ariraman et al developed CE–EP based SMP without adding a crystallizable segment. Wang et al blended the CE and polybutadiene EP (PBEP) by considering that a flexible aliphatic chain containing PBEP would serve as a reversible phase and cross-linked structure of cured CE would serve as a stationary phase.…”

Section: Shape Memory Characteristicsmentioning

confidence: 99%

Cyanate Ester—Epoxy Blends for Structural and Functional Composites

Salunke

Sasidharan

Gopinathapanicker

et al. 2021

Ind. Eng. Chem. Res.

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The blending of conventionally available polymers has been extensively investigated over the past several decades and is considered as an alternative cost-effective method for the development of new polymers for specific applications. The blending of thermosets invites special attention as many of them can be used as matrices for composites for primary load-bearing applications. Cyanate ester and epoxy are two of the most popular thermoset polymers used across various industries such as aerospace, automobile, military, and civil sectors. Nevertheless, each of these resins has its limitations when used individually. Hence the blending of cyanate ester and epoxy is significant, for both commercial and academic interests. In this article, investigations on blends of cyanate ester and epoxy are reviewed based on their properties. Emphasis has been made on modifications of such blends resulting in improvements in mechanical, thermal, and other functional properties. Various applications employing these thermoset blends are discussed subsequently.

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Shape memory effect and mechanical properties of cyanate ester-polybutadiene epoxy copolymer

Cited by 15 publications

References 27 publications

Synthesis of bio-castor oil polyurethane flexible foams and the influence of biotic component on their performance

Synthesis of bio-castor oil polyurethane flexible foams and the influence of biotic component on their performance

The effect molecular weight of polyol components on shape memory effect of epoxy‐polyurethane composites

Cyanate Ester—Epoxy Blends for Structural and Functional Composites

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