Huayan Pan

Northwest Institute of Nuclear Technology

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Ruihua Lv

East China University of Technology

Bing Na

East China University of Technology

Shufen Zou

East China University of Technology

Jie Zhu

Dongguan University of Technology

Qiang Yin

Anhui Academy of Agricultural Sciences

Ming‐Biao Luo

East China University of Technology

Qiang Fu

Sichuan University

Chun Li

Peking University

Zhiwei Yu

Harbin Engineering University

Mingbiao Luo

East China University of Technology

Cooperative Institutions

Northwest Institute of Nuclear Technology

East China University of Technology

North China Institute of Science and Technology

State Council of the People's Republic of China

Sichuan University

Nanjing University

Faculty (United Kingdom)

Qilu University of Technology

Changchun University of Science and Technology

Zhejiang University

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Electroactive Shape-Memory Ternary Composite Based on Bi-Component Biodegradable Polyester

Journal of Macromolecular Science Part B (2012)

Bing Na Huayan Pan Ruihua Lv Ming‐Biao Luo Shufen Zou

Shape-memory polymers (SMPs) are stimuli-responsive materials whose shape recovery is usually stimulated by directly heating above the switching temperature. However, combination of SMPs with conductive fillers enables shape recovery by applying a voltage instead of using external heating, which may permit fabrication of smart electroactive actuators. Herein, we demonstrate that, by controlling drawing temperature and related morphology, rapid electroactive shape recovery has been realized in a ternary composite consisting of multiwalled carbon nanotubes (MWCNTs) and two biodegradable polyesters, a property that was not available in composites using only one of the polyesters.

Shape-memory polymer

Electroactive polymers

Smart material

Component (thermodynamics)

10.1080/00222348.2012.659964

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Citations (2)

Embrittlement of poly (L-lactide)/poly (ε-caprolactone) blends upon physical aging

Journal of Polymer Research (2012)

Huayan Pan Bing Na Ruihua Lv Shufen Zou

Embrittlement

Toughening

Ductility (Earth science)

Brittleness

Caprolactone

Lactide

10.1007/s10965-012-9936-z

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Citations (5)

Unusual Cold Crystallization Behavior in Physically Aged Poly(l-lactide)

The Journal of Physical Chemistry B (2011)

Bing Na Shufen Zou Ruihua Lv Mingbiao Luo Huayan Pan

A comparative study of cold crystallization behavior in poly(L-lactide) (PLLA) annealed below and just above the glass transition temperature (T(g)) has been conducted. Annealing benefits the generation of local order and the subsequent cold crystallization process, which becomes significant in PLLA annealed just above T(g). Surprisingly, morphological observation reveals high density nuclei in PLLA annealed below T(g), contrary to its relatively slow crystallization kinetics. This unusual crystallization behavior in physically aged PLLA arises from the retarded crystal growth rate because of incomplete recovery of reduced segmental mobility above T(g). In contrast, annealing just above T(g) has little influence on the crystal growth rate, and the increased nucleation density alone accounts for the accelerated crystallization rate.

10.1021/jp2060816

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Citations (38)

Influence of Thermal Treatment on Cold Crystallization Behavior of PLLA/PDLLA Blends

Huayan Pan

Effect of thermal treatment on the cold crystallization of PLLA and PLLA/PDLLA (PLLA/PDLLA=1∶1) blends has been studied by differential scanning calorimetry (DSC) and atomic force microscopy (AFM) measurements. Results show that the acceleration in the cold crystallization of PLLA arises from the enhanced nucleation after the thermal treatment. The slower is the cooling rate, the higher is the nucleation effect. As compared to PLLA, the change of nucleation ability with respect to cooling rate becomes less significant in the PLLA/PDLLA blends, originating from that amorphous PDLLA prevents the formation of local order during thermal treatment.

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The plasticizer‐assisted formation of a percolating multiwalled carbon nanotube network in biodegradable poly(L‐lactide)

Journal of Applied Polymer Science (2011)

Shufen Zou Bing Na Ruihua Lv Huayan Pan

Abstract A plasticizer, polyethylene glycol (PEG), was used to disperse multiwalled carbon nanotubes (MWCNTs) in biodegradable poly( L ‐lactide) during one‐step melt mixing. Incorporation of PEG significantly promotes the formation of a percolating MWCNT network in the plasticized composites, as revealed by rheological measurements and morphological observations. It, in turn, results in the retarded glass transition and cold crystallization behaviors in these plasticized composites as a result of constrained chain relaxation. It is believed that noncovalent wrapping of MWCNTs by PEG is responsible for the improved affinity between MWCNTs and the poly( L ‐lactide) matrix. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Plasticizer

Lactide

10.1002/app.34658

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Citations (7)

Stretch‐induced molecular ordering in amorphous/crystalline polylactide blends

Polymer Engineering and Science (2012)

Ruihua Lv Shufen Zou Bing Na Huayan Pan Huiyu Deng

Abstract The effect of amorphous poly( D , L ‐lactide) (PDLLA) on the molecular orientation and crystallization of crystalline poly( L ‐lactide) (PLLA) on stretching is reported in this study. It is indicated that the presence of PDLLA in its miscible blends with PLLA is not favorable for either cohesive mesophase formation below T g or strain‐induced crystallization above T g at strains beyond the segmental extensibility limit. Because of lack of constraints imposed by cohesive mesophase or crystals, oriented segments are liable to slide each other or recoil, responsible for low‐molecular orientation in the stretched blends. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers

Lactide

10.1002/pen.23233

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Citations (11)

Emphasis on prevention and management strategy of iatrogenic injury in choledocho-pancreatico-duodenal junction

Chinese Journal of Practical Surgery (2013)

Huayan Pan

Generalized choledocho-pancreatico-duodenal junction includes distal bile duct,pancreatic duct,duodenum, peripheral blood vessels and nerves,which has a complex anatomical composition,can easily be damaged during operation. Therefore it requires further research in pathogenesis,diagnosis and management of iatrogenic injury of choledocho-pancreatico-duodenal junction. By the effective prevention,early diagnosis and proper management during perioperation,morbidity and mortality of iatrogenic injury of choledocho-pancreatico-duodenal junction can be reduced significantly.

Iatrogenic injury

Source

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A facile route to ordered γ phase in poly (vinylidene fluoride) via melt annealing and re-crystallization

Materials Letters (2012)

Bing Na Huayan Pan Ruihua Lv Jie Zhu Chun Li

10.1016/j.matlet.2012.06.102

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Citations (19)

Polar phase formation in poly(vinylidene fluoride) induced by melt annealing

Journal of Polymer Science Part B Polymer Physics (2012)

Huayan Pan Bing Na Ruihua Lv Chun Li Jie Zhu

Abstract It is still a challenge to obtain polar phase of poly(vinylidene fluoride) from melt crystallization at normal conditions. This study demonstrates that polar β‐ and γ phases can be produced through melting re‐crystallization of α phase, provided that moderate memory effects in the melt is achieved by annealing. Otherwise, it is inevitable to re‐crystallize into α phase without any trace of polar phase. Small fragments, generated from the disintegration of long TGTG′ sequences, most likely adopt trans conformation in the melt before approaching random coils, thus responsible for the formation of polar phase upon cooling. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012

10.1002/polb.23146

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Citations (113)