High strain epoxy shape memory polymer

Zheng, Ning; Fang, Guangqiang; Cao, Zhen; Zhao, Qian; Xie, Tao

doi:10.1039/c5py00172b

Cited by 182 publications

(130 citation statements)

References 52 publications

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“…V r p%{˝Cq " ∆%SR ∆T ∆%SR (11) where %SR is the percentage of original shape recovered normalized to the permanent strain (ε p ), ∆%SR is the range tested (%SR = 1%-100% and 15%-85%) and ∆T ∆%SR is the temperature increment corresponding to the ∆%SR.…”

Section: Thermo-mechanical and Network Structure Propertiesmentioning

confidence: 99%

“…The results demonstrated an improvement of the strain at break of three-to five-fold, when deforming at a temperature slightly below the T g , corresponding to the onset point of the network relaxation process (measured by dynamic-mechanical analyses). Recently, Zheng et al [11] presented a high strain two component epoxy-amine (up to 210% of strain at break when deforming at the onset temperature) with tailorable T g and excellent shape-fixity and shape-recovery performances.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Network Structure and Programming Temperature on the Shape-Memory Response of Thiol-Epoxy “Click” Systems

et al. 2015

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This paper presents a new methodology to develop "thiol-epoxy" shape-memory polymers (SMPs) with enhanced mechanical properties in a simple and efficient manner via "click" chemistry by using thermal latent initiators. The shape-memory response (SMR), defined by the mechanical capabilities of the SMP (high ultimate strength and strain), the shape-fixation and the recovery of the original shape (shape-recovery), was analyzed on thiol-epoxy systems by varying the network structure and programming temperature. The glass transition temperature (T g ) and crosslinking density were modified using 3-or 4-functional thiol curing agents and different amounts of a rigid triglycidyl isocyanurate compound. The relationship between the thermo-mechanical properties, network structure and the SMR was evidenced by means of qualitative and quantitative analysis. The influence of the programming temperature (T prog ) on the SMR was also analyzed in detail. The results demonstrate the possibility of tailoring SMPs with enhanced mechanical capabilities and excellent SMR, and intend to provide a better insight into the relationship between the network structure properties, programming temperature and the SMR of unconstrained (stress-free) systems; thus, making it easier to decide between different SMP and to define the operative parameters in the useful life.

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Section: Thermo-mechanical and Network Structure Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the Network Structure and Programming Temperature on the Shape-Memory Response of Thiol-Epoxy “Click” Systems

et al. 2015

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“…As a consequence, thermosetting SMPs, especially epoxybased SMPs, have been highly attractive particularly in advanced applications [13,18,19]. To further broaden the useful property range of shape memory epoxy, epoxy-based shape memory copolymers and epoxy-based shape memory composites have also been developed [18][19][20][21]. Recently, Xie and Rousseau [20] had developed methods to tailor transition temperature (T g ) and shape recovery properties of SMPs based on aromatic epoxy as hard segments, aliphatic epoxy as soft segments and aliphatic amine as curing agents.…”

mentioning

confidence: 99%

Effects of benzoxazine resin on property enhancement of shape memory epoxy: A dual function of benzoxazine resin as a curing agent and a stable network segment

Tanpitaksit¹,

Jubsilp²,

Rimdusit³

2015

Express Polym. Lett.

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Abstract. An ability of bisphenol-A/aniline based benzoxazine resin (BA-a) to simultaneously acts as a curing agent and a stable or rigid network segment for shape memory epoxy, i.e. a two component system, is demonstrated. This significantly simplifies a formulation of present shape memory epoxy systems, i.e. a three or four component system. A suitable content of BA-a in the aliphatic epoxy (NGDE)/polybenzoxazine (PBA-a) samples for good shape memory performance is in a range of 30 to 50 mol%. The storage modulus of the obtained NGDE/PBA-a shape memory polymers (SMPs) was increased from 3.57 GPa for 30 mol% BA-a content to 4.50 GPa for 50 mol% BA-a content. Glass transition temperature of the sample was also substantially increased with increasing BA-a fraction, i.e. from 51°C to 140°C. Flexural modulus and strength at room temperature of the samples at 50 mol% BA-a were found to be as high as 3.97 GPa and 132 MPa compared to the maximum values of 2.54 GPa and 100 MPa of SMP based on cyanate ester-epoxy. All samples exhibited a high value of shape fixity close to 100%. A presence of the BA-a in the samples also imparted a greater recovery stress ranging from 0.25 to 1.59 MPa. Consequently, the obtained NGDE/PBA-a copolymers are highly attractive for shape memory materials to be used in a broader range of applications particularly at elevated temperature and a higher recovery stress value.

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“…Therefore, it is very necessary to design the remote control of SMPs. In fact, a couple of remote triggering methods, including light and an alternating magnetic field, have been developed to achieve the noncontact activation of the shape memory effect [16]. In addition, these remote-activated SMPs have attracted a great deal of interest recently.…”

Section: Introductionmentioning

confidence: 99%

Shape Memory Polymer Composites of Poly(styrene-b-butadiene-b-styrene) Copolymer/Liner Low Density Polyethylene/Fe3O4 Nanoparticles for Remote Activation

Wang

Tian

2016

Applied Sciences

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Magnetically sensitive shape memory poly(styrene-b-butadiene-b-styrene) copolymer (SBS)/liner low density polyethylene (LLDPE) composites filled with various contents of Fe 3 O 4 nanoparticles were prepared. The influence of the Fe 3 O 4 nanoparticles content on the thermal properties, mechanical properties, fracture morphology, magnetic behavior, and shape memory effect of SBS/LLDPE/Fe 3 O 4 composites was systematically studied in this paper. The results indicated that homogeneously dispersed Fe 3 O 4 nanoparticles ensured the uniform heat generation and transfer in the alternating magnetic field, and endowed the SBS/LLDPE/Fe 3 O 4 composites with an excellent magnetically responsive shape memory effect. When the shape memory composites were in the alternating magnetic field (f = 60 kHz, H = 21.21 kA·m −1 ), the best shape recovery ratio reached 99%, the shape retention ratio reached 99.4%, and the shape recovery speed increased significantly with the increment of Fe 3 O 4 nanoparticles. It is anticipated that tagging products with this novel shape memory composite is helpful for the purpose of an intravascular delivery system in Micro-Electro-Mechanical System (MEMS) devices.

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High strain epoxy shape memory polymer

Abstract: Epoxy polymers represent a recently emerged class of thermoset shape memory polymers with superior thermo-mechanical endurance and excellent processability.

Cited by 182 publications

References 52 publications

Effect of the Network Structure and Programming Temperature on the Shape-Memory Response of Thiol-Epoxy “Click” Systems

Effect of the Network Structure and Programming Temperature on the Shape-Memory Response of Thiol-Epoxy “Click” Systems

Effects of benzoxazine resin on property enhancement of shape memory epoxy: A dual function of benzoxazine resin as a curing agent and a stable network segment

Shape Memory Polymer Composites of Poly(styrene-b-butadiene-b-styrene) Copolymer/Liner Low Density Polyethylene/Fe3O4 Nanoparticles for Remote Activation

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