Super-tough poly(lactic acid) thermoplastic vulcanizates with heat triggered shape memory behaviors based on modified natural Eucommia ulmoides gum

Wang, Yan; Liu, Jinhui; Xia, Lin; Shen, Mowei; Xin, Zhenxiang

doi:10.1016/j.polymertesting.2019.106077

Cited by 25 publications

(25 citation statements)

References 31 publications

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“…This increase can be ascribed to the increase in cross‐linking density, and the latter was further evidenced by swelling measurement results (Figure 2B). Based on the aforementioned results as well as our previous findings, [ 10,23,35 ] the formation of covalent cross‐linking networks in the EUG/PB‐1 composites are schematically shown in Figure 2C. As the initiating reaction, DCP was decomposed into free radicals, which attacked EUG and PB‐1 molecules at 170°C leading to the formation of macromolecular free radicals.…”

Section: Resultssupporting

confidence: 68%

“…[17][18][19][20][21][22] However, formation of "sea-island" phase morphology is unfavorable for high shape recovery force as well as excellent mechanical properties of polymer composites due to weakened interfacial adhesion. [19,23,24] Therefore, it is essential to promote interfacial interaction by tailoring the phase morphology for the development of shape memory composites via polymer blending.…”

Section: Introductionmentioning

confidence: 99%

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Covalent crosslinks turn natural Eucommia ulmoides gum/polybutene‐1 composites into multiple shape memory materials

et al. 2021

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A series of shape memory natural Eucommia ulmoides gum (EUG)/polybutene‐1 (PB‐1) composites were developed based on polymer blending. It was revealed that covalent crosslinks turned typical “sea‐island” phase morphology in the EUG/PB‐1 blend into a chemical co‐continuous structure, which played a vital role in promoting mechanical performances and fulfilling multiple shape memory effect dominated by the two well‐separated crystalline and melting phase transitions. Although the increase in cross‐linking density was a disadvantage to mechanical performances and shape fixing, the composite with more covalent crosslinks displayed better shape recovery capacity. The EUG/PB‐1 composite crosslinked by 0.4 phr diycumyl peroxide (DCP) displayed the highest shape fixing capacity, while the best shape recovery ability was given by that crosslinked by 1.6 phr DCP. The findings would provide a new technique to develop intelligent materials applied in smart packaging and hot‐shrinkable products.

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Section: Resultssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Covalent crosslinks turn natural Eucommia ulmoides gum/polybutene‐1 composites into multiple shape memory materials

et al. 2021

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“…Summarizing T g and T di values of fully and partially biobased SMPs reported in literature so far (Figure b, Table S1), − ,,− it is interesting to conclude that poly(IE-dea) and poly(G-dea) have superiorly high, and in fact the highest, thermal resistance among all available fully biobased SMPs reported so far.…”

Section: Results and Discussionmentioning

confidence: 85%

Development and Mechanism of High-Performance Fully Biobased Shape Memory Benzoxazine Resins with a Green Strategy

Sha

Yuan

Liang

et al. 2020

ACS Sustainable Chem. Eng.

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Developing high-performance fully biobased shape memory thermosets with a green strategy is a challenging topic of great interest. Herein, two unique fully biobased benzoxazine resins with excellent shape memory properties, denoted as poly(IE-dea) and poly(G-dea), were developed by synthesizing two fully biobased benzoxazine monomers (IE-dea and G-dea) using a solvent-free method. The thermal, mechanical, and shape memory properties of poly(IE-dea) and poly(G-dea) were studied. Among the fully biobased shape memory polymers reported so far, poly(IE-dea) and poly(G-dea) have the highest glass transition temperatures (138 and 216 °C), initial thermal decomposition temperatures (340 and 347 °C), and tensile strengths (85.1 ± 2.5 and 65.9 ± 2.7 MPa). In addition, poly(IE-dea) and poly(G-dea) exhibit excellent shape memory properties. After four shape memory cycles, their shape fixity ratios are 97.7–98.0% and 96.7–97.2%, respectively, and their shape recovery ratios are 96.7–97.2% and 93.0–93.4%. In fact, they are the first two fully neat biobased shape memory benzoxazine resins up-to-date. The mechanism behind the excellent integrated performances of poly(IE-dea) and poly(G-dea) results from unique integrated actions of the flexible decane segment and rigid cross-linked structure from the polymerization of oxazine rings.

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“…USA) in force control mode. The shape fixity ratio (R f ) and shape recovery ratio (R r ) were used to assess shape memory properties, which are calculate as following: [55]…”

Section: Methodsmentioning

confidence: 99%

Bio‐Based, Self‐CrosslinkableEucommia ulmoidesGum/Silica Hybrids with Body Temperature Triggering Shape Memory Capability

Jia

et al. 2021

Macro Materials & Eng

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At present, the synthesis of body temperature triggering shape memory polymers usually requires elaborate structural design, which limits their wide application. Herein, starting from bio-based Eucommia ulmoides gum (EUG), a series of EUG/silica hybrids (ESHs) are prepared through a facile one-pot process, in which EUG is epoxied and then self-crosslinked with SiO 2 by epoxy ring-open reaction. Varying the amount of H 2 O 2 , the shape memory transition temperature (T trans ) of ESHs is adjusted to 47.4-36.6 °C, which is close to human body temperature (37 °C). Among them, ESH-17 exhibited the best body temperature triggering shape memory ability (T trans = 36.6 °C), which can restore the permanent shape within 60 s at 37 °C with a shape fixity ratio of 99% and shape recovery ratio near 100%. In addition, the shape memory mechanism is discussed and shows some application scenarios of ESHs. The as-produced materials can be used as smart biomaterials such as self-tightening sutures, self-sealing root canal filling materials, and so on.

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Super-tough poly(lactic acid) thermoplastic vulcanizates with heat triggered shape memory behaviors based on modified natural Eucommia ulmoides gum

Cited by 25 publications

References 31 publications

Covalent crosslinks turn natural Eucommia ulmoides gum/polybutene‐1 composites into multiple shape memory materials

Covalent crosslinks turn natural Eucommia ulmoides gum/polybutene‐1 composites into multiple shape memory materials

Development and Mechanism of High-Performance Fully Biobased Shape Memory Benzoxazine Resins with a Green Strategy

Bio‐Based, Self‐CrosslinkableEucommia ulmoidesGum/Silica Hybrids with Body Temperature Triggering Shape Memory Capability

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