Crosslinked polyurethanes with shape memory properties

Hu, Jinlian; Yang, Zhuohong; Yeung, Lapyan; Jiang, Feng; Liu, Yeqiu

doi:10.1002/pi.1785

Cited by 144 publications

(101 citation statements)

References 11 publications

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“…Thus, PU is versatile with respect to its structure and properties. Further, it is available in various forms, thermoplastic, foam, elastomer, and fiber [13,14]. Thus, among the different types of SMP, PU is a good candidate as SMP for various advanced applications.…”

Section: Introductionmentioning

confidence: 99%

Polyurethane: A Shape Memory Polymer (SMP)

Thakur¹,

Hu²

2017

Aspects of Polyurethanes

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Shape memory polymer (SMP) is a stimuli-responsive material with the ability to alter a programmed shape to its original shape upon triggering of an appropriate stimulus. For the past decades, SMP has dragged much interest in material field owing to its various and versatile applications. One archetypal SMP is polyurethane, which has a wideranging transition temperature for its shape recovery, retraction temperatures, inherent soft-hard segments, a high recoverable strain (up to 400%), high control of the softening, favorable and tunable physical properties, and so on. This chapter emphasizes on the raw materials required for the synthesis of shape memory polyurethane (SMPU), the principle of shape memory function, the design of protocol of SMPU, and their applications with future directions.

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Section: Introductionmentioning

confidence: 99%

Polyurethane: A Shape Memory Polymer (SMP)

Thakur¹,

Hu²

2017

Aspects of Polyurethanes

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“…The T m of the soft segment was selected for shape memory tests instead of T g because T g was too low for temperature control using our apparatus, and is too low for practical applications. 8,9 Shape recovery in the R series increased from 89% in R-1 to 91% in R-2 to 93% in R-5, and in the M series it increased similarly from 87% in M-1 to 92% in M-3 to 95% in M-5. In F series, shape recovery remained high for all of the dyes contents: 97% in F-1 changed to 97% in F-3 to 96% in F-5.…”

Section: Introductionmentioning

confidence: 97%

“…[1][2][3][4][5][6][7] Many structural modifications of SMPU such as flexible cross-linking method were tried to simultaneously improve both tensile mechanical and shape memory properties without a decrease in tensile strain. [8][9][10][11][12] In addition to the improvement in above properties, special effects such as electric or magnetic response, metal ion sensing, low temperature shape recovery, temperature or pH-sensing, and electric conductivity can be endowed to SMPU chains through the covalent coupling of functional molecules. For example, a SMPU that can sustain shape recovery even at −30 o C has been reported.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Fluorescent Shape Memory Polyurethanes Grafted with Various Dyes

Chung¹,

Choi²,

Lee³

et al. 2011

Bulletin of the Korean Chemical Society

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Shape memory polyurethane (SMPU), grafted with a fluorescent dye (Rhodamine, Mehylene violet, or Fluorescein) through an allophanate linking, was tested for the fluorescence and the shape recovery effect. The main chain of SMPU was composed of 4,4'-methylenebis(phenylisocyanate) (MDI), poly(tetramethyleneglycol) (PTMG), and 1,4-butanediol (BD), and a fluorescent dye was connected through a second MDI linked to the carbamate moiety of the main chain. Three series of SMPU, differing according to their dye content, were prepared to compare their shape recovery and fluorescence properties. In tensile mechanical property, maximum stress increased up to 350% compared to the linear SMPU, and strain remained above 2000%. Shape recovery went to as high as 97%, and remained almost same after repetitive shape recovery test cycles. Finally, the fluorescence emission of SMPU was demonstrated in the luminescence spectrum and fluorescent light emission pictures. In addition, the response of SMPU to external stimuli such as metal ions was investigated.

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“…Comprehensive comparisons of SMAs with SMPs have been given by Feninat et al [22] and Hornbogen [23]. An SMP can be deformed from a permanent into a stress-free temporary shape, which can be fixed and maintained until shape recovery is triggered through an external stimulus, most common a temperature increase above the SMP's so-called transformation or switching temperature [7,10,11,[24][25][26]. Depending on the material used, stimuli can also be light [27] (UV [28], infrared or laser light [29][30][31][32][33]), electricity [30,[34][35][36][37][38][39][40][41][42][43][44], an alternating magnetic field, pH changes [49] and solvents [50][51][52][53].…”

Section: Open Accessmentioning

confidence: 99%

Review on the Functional Determinants and Durability of Shape Memory Polymers

Pretsch

2010

Polymers

112

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Shape memory polymers (SMP) belong to the class of stimuli-responsive materials and have generated significant research interest. Their capability to retain an imposed, temporary shape and to recover the initial, permanent shape upon exposure to an external stimulus depends on the "functional determinants", which in simplistic terms, can be divided into structural/morphological and processing/environmental factors. The primary aim of the first part of this review is to reflect the knowledge about these fundamental relationships. In a next step, recent advances in shape memory polymer composites are summarized. In contrast to earlier reviews, studies on the impairment of shape memory properties through various factors, such as aging, compression and hibernation, lubricants, UV light and thermo-mechanical cycling, are extensively reviewed. Apart from summarizing the state-of-the-art in SMP research, recent progress is commented.

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Crosslinked polyurethanes with shape memory properties

Cited by 144 publications

References 11 publications

Polyurethane: A Shape Memory Polymer (SMP)

Polyurethane: A Shape Memory Polymer (SMP)

Investigation of Fluorescent Shape Memory Polyurethanes Grafted with Various Dyes

Review on the Functional Determinants and Durability of Shape Memory Polymers

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