Triple-shape memory properties of thermoplastic polyurethane/olefin block copolymer/polycaprolactone blends

Lai, Sun‐Mou; You, Pei-Yun; Chiu, Yu Ting; Kuo, Chia Wen

doi:10.1007/s10965-017-1319-z

Cited by 27 publications

(15 citation statements)

References 39 publications

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“…Peroxide was known to crosslink polyolefin polymers with substantial amount of gel content. Note that peroxide was suggested to initiate free radicals on EVA and PCL to promote the formation of EVA‐co‐PCL copolymer and improve the interfacial interaction in the peroxide crosslinked blends . From the gel content measurement, as the gel content was up to 97.6 ± 0.9%, thus the macroradicals were expected to contribute to the copolymer formation as well, not just the crosslinking effect.…”

Section: Resultsmentioning

confidence: 99%

“…We have discussed some of similar experimental and characterization methods in our previous work on preparing 1-way triple-shape memory TPU/olefin block copolymer/PCL blends via a melt-blending method without chemical crosslinking. 34 A brief description on those preparation methods is described here. EVA and PCL were predried for 24 hours at 50°C in a vacuum oven, followed by melt mixing under 50 rpm.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Note that peroxide was suggested to initiate free radicals on EVA and PCL to promote the formation of EVA-co-PCL copolymer and improve the interfacial interaction in the peroxide crosslinked blends. 34 From the gel content measurement, as the gel content was up to 97.6 ± 0.9%, thus the macroradicals were expected to contribute to the copolymer formation as well, not just the crosslinking effect. Accordingly, the compatibility tended to increase with the help of peroxide curing agent acting as a compatibilizer as well.…”

Section: Morphologymentioning

confidence: 99%

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Two‐way multi‐shape memory properties of peroxide crosslinked ethylene vinyl‐acetate copolymer (EVA)/polycaprolactone (PCL) blends

Han

Lai

Chiu

2018

Polymers for Advanced Techs

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Rare studies have investigated on the 2‐way shape memory crosslinked blends with multiple shape memory behavior up to date. To consider the merit of commercial cost‐competitive crystalline polymers, ethylene vinyl‐acetate copolymer (EVA)/polycaprolactone (PCL) blends (60/40 and 30/70) were peroxide‐cured to form the 2‐way multi‐shape memory crosslinked blends using a melt‐blending method. Both resins were selected to have a similar controlled crosslinking degree, which allowed us to distinctly evaluate their actuation contributions from the cooling‐induced elongation (crystallization) and from the entropy‐driven elongation during cooling process, respectively. In the 2‐way process for the 60/40 system, 2 respective peaks contributed from the cooling‐induced crystallization of EVA and PCL in the cooling curves based on the strain derivate rates at various temperatures were observed. After the cooling process under the loading stress of 150 kPa, the 2‐step heating‐induced contraction process with increasing temperature started at 54.1°C above the melting temperature of PCL at 52.3°C and EVA at 78.3°C, demonstrating 2‐way multi‐shape memory behavior. The multi‐step behavior was more prominent at higher PCL composition and higher load for the 30/70 system. It was found that the entropy‐driven contribution to the overall actuation magnitude increased with increasing nominal loads due to the increased orientation of molecular networks in the blends. The current approach offers numerous possibilities in preparing 2‐way multi‐shape memory crosslinked blends.

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Section: Resultsmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Morphologymentioning

confidence: 99%

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Two‐way multi‐shape memory properties of peroxide crosslinked ethylene vinyl‐acetate copolymer (EVA)/polycaprolactone (PCL) blends

Han

Lai

Chiu

2018

Polymers for Advanced Techs

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“…The netpoint originated from chemical or physical cross‐links is used to stabilize the permanent shape, while the switching unit associating with transition temperature ( T trans ) can switch on/off the molecular mobility and fix a deformed shape. Generally for an immiscible shape memory polymer blend , the netpoint is usually made of rubber and/or elastomer, and the switching unit is amorphous or crystalline polymer. In styrene–butadiene–styrene tri‐block copolymer (SBS)/poly(ε‐caprolactone) (PCL) system , semicrystalline polymer PCL was introduced as the switching unit, while thermoplastic elastomer SBS was designed as the netpoint.…”

Section: Introductionmentioning

confidence: 99%

A Facile Fabrication of PCL/OBC/MWCNTs Nanocomposite with Selective Dispersion of MWCNTs to Access Electrically Responsive Shape Memory Effect

et al. 2018

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poly(ε‐caprolactone) (PCL)/ethylene‐α‐octene block copolymer (OBC)/multiwalled carbon nanotubes (MWCNTs) nanocomposite was prepared in this work. After achieving the co‐continuous phase morphology of PCL/OBC binary blend by varying the composition, MWCNTs were selectively dispersed in OBC as conductive filler to investigate the electrically responsive shape memory effect. The results indicated that the shape memory effect (SME) of PCL/OBC was sensitive to the composition of component. The optimal SME could be observed when the volume fraction of PCL and OBC was 50:50, which was applied for the further exploration of electrically responsive SME. Additionally, the MWCNTs selectively located in OBC formed percolated structure when the component of MWCNTs was 1.5 vol%, and the shape recovery ratio (Rr) increased with MWCNTs content and applied voltage. Typically, the sample exhibited the excellent electrically actuated shape memory effect when the MWCNTs loading was 5 vol%. Ultimately, it only took 30 s for the sample to achieve the 100% recoverability under 30 V. POLYM. COMPOS., 40:E1353–E1363, 2019. © 2018 Society of Plastics Engineers

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“…By so far, some multi-phase blends possessing TSME have been reported, such as polyethylene (PE)/polycyclooctene blends and thermoplastic polyurethane (TPU)/olen block copolymer/PCL blends. 33,34 For the shape memory compounds, the co-continuous morphology was known to show better shape memory performance. 20,35 However, it is hard to tailor a multicomponent structure to be co-continuous via conventional melt processing because of the numerous inuencing factors (e.g.…”

Section: Introductionmentioning

confidence: 99%

Structural design of polyurethane/poly(butylene succinate)/polycaprolactone compounds via a multilayer-assembled strategy: achieving tunable triple-shape memory performances

Zheng

Wang

et al. 2018

RSC Adv.

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Triple-shape memory properties of thermoplastic polyurethane/olefin block copolymer/polycaprolactone blends

Cited by 27 publications

References 39 publications

Two‐way multi‐shape memory properties of peroxide crosslinked ethylene vinyl‐acetate copolymer (EVA)/polycaprolactone (PCL) blends

Two‐way multi‐shape memory properties of peroxide crosslinked ethylene vinyl‐acetate copolymer (EVA)/polycaprolactone (PCL) blends

A Facile Fabrication of PCL/OBC/MWCNTs Nanocomposite with Selective Dispersion of MWCNTs to Access Electrically Responsive Shape Memory Effect

Structural design of polyurethane/poly(butylene succinate)/polycaprolactone compounds via a multilayer-assembled strategy: achieving tunable triple-shape memory performances

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