Study on shape-memory behavior of polyether-based polyurethanes. II. Influence of soft-segment molecular weight

Lin, Jiang-Jen; Chen, L. W.

doi:10.1002/(sici)1097-4628(19980822)69:8<1575::aid-app12>3.0.co;2-u

Cited by 200 publications

(124 citation statements)

References 4 publications

(4 reference statements)

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“…Compared with shape memory metallic alloys and shape memory ceramics, SMPs possess the advantages of light weight, low cost, good processability, high shape deformability and recoverability, and tailored switch temperature [1][2][3][4][5][6][7][8][9][10]. Since the 1990s, SMPs have been increasingly developed and widely applied in smart textiles and apparels [11,12], intelligent medical devices [13][14][15], and self-deployable structures in spacecrafts [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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A type of thermal-induced shape memory polymer was fabricated using a new epoxy resin-polybutadiene epoxy (PBEP) and bisphenol A-type cyanate ester in different mass ratios. Mechanical performance, thermal properties, and shape memory behaviors were investigated systematically. This polymer system presented good shape memory properties. The deformation recovery speed increased with the increase in the amount of PBEP. The maximum deformation recovery speed was 0.0128 s , and the minimum value was 0.0073 s −1 . The deformation recovery rate was almost 100 %.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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“…This was called shape fixity in shape memory behavior. To change the deformed shape, SMPs could recover the memorized shape by heating over glass transition temperature under a free load condition (step 4), and then go through the process again as above [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Shape memory effect and mechanical properties of carbon nanotube/shape memory polymer nanocomposites

Zhang

Fu³

et al. 2007

Composite Structures

227

102

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Abstract:Carbon nanotubes (CNT) have remarkable mechanical properties with very high elastic modulus and electrical conductivity. Shape memory polymer (SMP) as one of smart materials is characterized with its remarkable recoverability and shape memory effect, but its mechanical properties such as strength and elastic modulus is not high enough. In this study, CNT/SMP nanocomposites were developed with the typical CNTs of the vapor growth carbon fibers (VGCFs). A fine and homogeneous dispersion of VGCF throughout the SMP matrix is obtained. The specimens with different VGCF weight fraction, such as SMP bulk, 1.7wt%, 3.3wt% and 5.0wt%, were prepared, and their dynamic mechanical properties and shape recovery behavior were investigated. It was found that storage elastic modulus is improved obviously with increment of VGCF weight fraction, and the CNT/SMP nanocomposites showed a good shape memory effect. It is indicated that the recovery stress of CNT/SMP nanocomposites with only 3.3% weight fraction of carbon nanotubes will reach almost twice of that in SMP bulk.

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“…DSC results show that as increase the hard segment content (higher n), higher is the glass transition temperature 11,12 . This suggests that hard segment interaction among polymeric chains were strengthened at low hard segment content, due to these hard segments can achieve a more well-oriented position within the polymeric structure.…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Synthesis and characterization of shape memory polyurethanes

Sáenz-Pérez

Laza

León

et al. 2015

Proceedings of MOL2NET, International Conference on Multidisciplinary Sciences

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Shape memory polymers (SMPs) have attracted extensive attention from basic and fundamental research to industrial and practical applications because they have emerged as a cheap and efficient alternative to well-known metallic shape-memory alloys. Among them, shape memory polyurethanes (SMPUs) own different applications such as the textile finishing, adhesives, coatings, automotive, furniture, construction, and thermal insulation and footwear industries, due to it can be synthesized with different types of molecular architectures by manipulating their composition and choosing properly the chemical structure of their components. In this work, the synthesis and characterization of shape memory polyurethanes, based on two-step polymerization, is reported. The hard segment of SMPU was composed of diisocyanate and a chain extender. On the other hand, the soft segment was prepared by polyols with different molecular weights. Depending on the structure of the synthetized polyurethanes, the materials presented different properties. Thermal characterization was performed by means of Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). Furthermore, mechanical properties and shape memory effect were also determined by Dynamic Mechanical Analysis (DMA) and Thermo-Mechanical Analysis (TMA).

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Study on shape-memory behavior of polyether-based polyurethanes. II. Influence of soft-segment molecular weight

Cited by 200 publications

References 4 publications

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

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

Shape memory effect and mechanical properties of carbon nanotube/shape memory polymer nanocomposites

Synthesis and characterization of shape memory polyurethanes

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