Effects of carbon black nanoparticles on two-way reversible shape memory in crosslinked polyethylene

Ma, Lan; Zhao, Jun; Wang, Xiaoyan; Chen, Min; Liang, Yongri; Wang, Zhenwen; Yu, Ziniu; Hedden, Ronald C.

doi:10.1016/j.polymer.2014.11.036

Cited by 61 publications

(53 citation statements)

References 63 publications

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“…In other words, SMPs must be programmed, trained, or educated in order to demonstrate shape memory effect, at least for one‐way SMPs. For two‐way SMPs, although it seems that the polymer changes shape reversibly between two permanent shapes without programming, some special design or treatments, such as an internal tensile stress, are required, suggesting that some types of programming are also necessary. This is unique for SMPs because conventional thermosetting polymers, as the name indicated, usually cannot be physically or mechanically deformed into a temporary shape without introducing damages in the polymer or causing permanent, unrecoverable deformation.…”

Section: Introductionmentioning

confidence: 99%

Cold, warm, and hot programming of shape memory polymers

Wang

2016

J Polym Sci B Polym Phys

132

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In this article, programming is classified as hot, warm, and cold, based on the temperature zone within which the programming is conducted. The strain and stress locking and releasing mechanisms are discussed within the thermodynamics framework. A new formula is developed for quantifying the strain recovery ratio of cold-programmed SMPs. Stress fixity ratio and stress recovery ratio are also defined based on the understanding of stress locking and recovery mechanisms. State-of-the-art literature on warm and cold programming is reviewed. Well-controlled programming as well as free strain recovery test and constrained stress recovery test are conducted, in order to validate the memory mechanisms discussed in this study. It is found that, while programming temperature has an insignificant effect on the final free shape recovery, it has a significant effect on the stress recovery. The recovery stress programmed by cold programming may be lower, equal to, or higher than that by hot programming, due to the different stress locking mechanisms and other factors such as damage during the thermomechanical cycle.

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Section: Introductionmentioning

confidence: 99%

Cold, warm, and hot programming of shape memory polymers

Wang

2016

J Polym Sci B Polym Phys

132

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“…trans ‐1,4‐Polyisoprene (TPI) and polyethylene (PE) could be used as shape memory materials with a moderate degree of cross‐linking. The shape memory properties of TPI, PE, and their blends have been investigated in recent years . However, the disadvantage of most shape memory composites is their poor mechanical properties, and TPI and PE composites are no exception.…”

Section: Introductionmentioning

confidence: 99%

Shape memory behavior of carbon nanotube‐reinforced trans‐1,4‐polyisoprene and low‐density polyethylene composites

Xia

Gui-xue

2019

Polymers for Advanced Techs

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Shape memory composites of trans‐1,4‐polyisoprene (TPI) and low‐density polyethylene (LDPE) with easily achievable transition temperatures were prepared by a simple physical blending method. Carbon nanotubes (CNTs) were introduced to improve the mechanical properties of the TPI/LDPE composites. The mechanical, cure, thermal, and shape memory properties of the TPI/LDPE/CNTs composites were investigated in this study. In these composites, the cross‐linked network generated in both the TPI and LDPE portions acted as a fixed domain, while the crystalline regions of the TPI and LDPE portions acted as a domain of reversible shape memory behavior. We found that CNTs acted as not only reinforced fillers but also nucleation agents, which improved the crystalline degree of the TPI and LDPE portions of the composites. Compared with the properties at the other CNT doses, the mechanical properties of the TPI/LDPE composites when the CNT dose was 1 phr were improved significantly, showing excellent shape memory properties (Rf = 97.85%, Rr = 95.70%).

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“…Heat‐triggered SMPs usually consist of two phases, that is, stationary phase and reversible phase. Typically, stationary phase could be chemical or physical structures to maintain the permanent shape; meanwhile, the reversible phase could complete the shape transition of SMPs from permanent shape to temporary shapes . Such shape memory behavior is referred as one‐way shape memory effect (1W‐SME).…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of foamed natural Eucommia ulmoides gum composites with heat‐triggered shape memory behavior

2018

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Shape memory polymers (SMPs) are a type of smart material with potential application in aerospace engineering, biomedical devices, and sensors. In this article, we propose a new technique for the preparation of foamed Eucommia ulmoides gum (EUG) composites, which have excellent one‐way and two‐way shape memory performances. The advantages of these foamed composites are not only light weight but also good shape memory performance. For their remarkably light weight, large deformation, and efficient cost, these composites are expected to be a kind of popular smart materials in the future. We studied the properties of foamed composites via mechanical measurements, swelling experiments, thermal analysis and shape memory analysis, hoping to establish the relationship between the microstructure and macroscopic properties of composites. The results showed that the composites with 0.4 phr sulfur had superior one‐way shape memory properties and moderate mechanical properties. In the two‐way shape memory tests, the composites performed excellent two‐way shape memory properties with the applied stress ranging from 200 to 350 KPa. POLYM. COMPOS., 40:3075–3083, 2019. © 2018 Society of Plastics Engineers

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Effects of carbon black nanoparticles on two-way reversible shape memory in crosslinked polyethylene

Cited by 61 publications

References 63 publications

Cold, warm, and hot programming of shape memory polymers

Cold, warm, and hot programming of shape memory polymers

Shape memory behavior of carbon nanotube‐reinforced trans‐1,4‐polyisoprene and low‐density polyethylene composites

Facile fabrication of foamed natural Eucommia ulmoides gum composites with heat‐triggered shape memory behavior

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