A strengthening approach for damping property and shape memory property of acrylic rubber/polylactide blends

2018 ◽  
Vol 51 (7-8) ◽  
pp. 626-643
Author(s):  
Chengliang Li ◽  
Xingxing Ji ◽  
Yang Lyu ◽  
Xinyan Shi
Keyword(s):  
Shape Memory ◽  
Loss Factor ◽  
Phenol Formaldehyde ◽  
Mechanical Analysis ◽  
Damping Properties ◽  
Shape Memory Property ◽  
Memory Property ◽  
Damping Material ◽  
Shape Memory Properties ◽  
Shape Memory Effects

In this work, a damping material was successfully prepared by blending acrylic rubber (ACM) and polylactide (PLA) with sulfur and soap salt as the curing agents. A phenol-formaldehyde (PF) resin was used as a modifier. The effects of PF on the mechanical properties, damping properties, compatibility and shape memory properties of the blends were studied. The compatibility and damping properties were characterized by dynamic mechanical analysis, Fourier transform infrared spectroscope and microstructure analysis. The shape memory properties were examined by thermal mechanical analyser. The results revealed that the tensile strength of the blends was decreased and the toughness was increased with the increase of PF loadings. The introduction of PF improved the compatibility between PLA and ACM, which was deduced from the fact that the glass transition temperature of ACM was increased and the two loss factor peaks became closer. It was also found that the loss factor peak became higher and the effective damping temperature range became wider due to the formation of hydrogen bonding, implying that the damping properties of ACM/PLA blends were significantly improved. The ACM/PLA blends exhibited good dual-shape memory effect and its shape recovery ratio was increased by introduction of PF and raising the trigger temperature. The blends also exhibited good triple-shape memory property, which was dramatically improved by the introduction of PF. The mechanisms for the enhanced shape memory effects were then analysed.

Study on Shape Memory Effects of LC Epoxy Resins with Lateral Substituents

2010 ◽  
Vol 428-429 ◽  
pp. 391-393 ◽  
Author(s):  
Li Yan Liang ◽  
De Wen Zhou ◽  
Man Geng Lu
Keyword(s):  
Shape Memory ◽  
Dynamic Mechanical Analysis ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Mechanical Analysis ◽  
Memory Effects ◽  
Ordered Structures ◽  
Alkyl Groups ◽  
Shape Memory Properties ◽  
Shape Memory Effects

A series of shape memorized liquid crystalline epoxides with different length of lateral substituents were prepared with several kinds of hardener. The dynamic mechanical analysis and the sharp memory properties of the resulted LC epoxy resins were studied by POM, WAXD, DSC and DMA. The results showed that the modulus in the rubbery region (ER) of the LC epoxides decreases as the length of lateral alkyl groups increases. And the shape memory properties were strongly impacted not only by the length of lateral substituents, but also by the kinds of hardener. The recovering speeds of the shape-memory liquid crystalline epoxides decrease as the increasing length of lateral alkyl groups. And recovering speeds of LC epoxides cured with aromatic amine (DDM) are faster than that of LC epoxides cured with anhydride (THHPA). The local ordered structures and the lateral substituents played an important role in shape memory effects.

Hierarchical porous carbon nanofibrous membranes with an enhanced shape memory property for effective adsorption of proteins

RSC Advances ◽  
2015 ◽  
Vol 5 (79) ◽  
pp. 64318-64325 ◽  
Author(s):  
Gang Fan ◽  
Jianlong Ge ◽  
Hak-Yong Kim ◽  
Bin Ding ◽  
Salem S. Al-Deyab ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Protein Adsorption ◽  
Porous Carbon ◽  
Hierarchical Porous Carbon ◽  
Shape Memory Property ◽  
Memory Property ◽  
Adsorption Performance ◽  
Hierarchical Porous ◽  
Shape Memory Properties

A hierarchical porous CNF membrane with robust mechanical properties, exhibiting intriguing shape memory properties and efficient protein adsorption performance.

scholarly journals Post-Crosslinked Polyurethanes with Excellent Shape Memory Property

2017 ◽  
Vol 38 (23) ◽  
pp. 1700450 ◽  
Author(s):  
Wenkai Liu ◽  
Yun Zhao ◽  
Rong Wang ◽  
Jiehua Li ◽  
Jianshu Li ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Property ◽  
Memory Property

scholarly journals THE INFLUENCE OF SEVERAL TYPES OF RESINS ON THE DYNAMIC MECHANICAL PROPERTIES OF POLYMER MIXTURE BASED ON BUTYL RUBBER

2020 ◽  
Vol 3 (2) ◽  
pp. 36-45 ◽  
Author(s):  
O. Tarasova ◽  
Yu. Yurkin ◽  
A. Toroschin
Keyword(s):  
Phenol Formaldehyde ◽  
Dynamic Properties ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Strength Properties ◽  
Butyl Rubber ◽  
Polymer Materials ◽  
Polymer Mixture ◽  
Damping Properties ◽  
Dynamic Mechanical

this work is devoted to the problem of developing vibration-damping polymer materials with high damping properties in a wide temperature range. The study of the effect of modifying additives on the strength, damping, adhesive and cohesive properties of a butyl rubber composite is the aim of this work. The task is to identify the actual temperature, frequency, dynamic and mechanical characteristics of a composite material based on butyl rubber depending on the type and concentration of resins. The key methods for studying this problem is the dynamic mechanical analysis method, aimed at obtaining information about changes in the dynamic properties of polymer materials (bond strength with metal when peeling samples of composites, determining the flow resistance of samples, determining the migration of plasticizer). Due to the established experimental dependences, it was found that the addition of resins (3% by weight) in the composition based on butyl rubber leads to an increase in the damping properties of composite materials, and an increase to (4.25% by weight) leads to their decrease. It was established that the obtained filled mixtures with a high damping peak and good adhesive and strength properties are mixtures with the addition of alkyl phenol-formaldehyde resins.

scholarly journals Hydrogen bond-reinforced double-network hydrogels with ultrahigh elastic modulus and shape memory property

2018 ◽  
Vol 56 (19) ◽  
pp. 1281-1286 ◽  
Author(s):  
Yan Jie Wang ◽  
Chen Yu Li ◽  
Zhi Jian Wang ◽  
Yiping Zhao ◽  
Li Chen ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Elastic Modulus ◽  
Shape Memory ◽  
Shape Memory Property ◽  
Double Network ◽  
Memory Property

Remotely actuated porous composite membrane with shape memory property

2018 ◽  
Vol 192 ◽  
pp. 507-515 ◽  
Author(s):  
Yongtao Yao ◽  
Yun Luo ◽  
Haibao Lu ◽  
Bing Wang
Keyword(s):  
Shape Memory ◽  
Composite Membrane ◽  
Porous Composite ◽  
Shape Memory Property ◽  
Memory Property

Shape memory effects of EVM-GMA/PVC blends

2020 ◽  
pp. 009524432095358
Author(s):  
Yanlu Chen ◽  
Zhengwei Lin ◽  
Haotian Zhao ◽  
Xingxing Ji ◽  
Xinyan Shi
Keyword(s):  
Shape Memory ◽  
Glycidyl Methacrylate ◽  
Shape Recovery ◽  
Physical And Mechanical Properties ◽  
Ethylene Vinyl Acetate ◽  
Recovery Efficiency ◽  
Restoring Force ◽  
Shape Memory Properties ◽  
Shape Memory Effects ◽  
Two Phases

In this paper, polyvinyl chloride (PVC) masterbatch, prepared using ethylene-vinyl acetate-glycidyl methacrylate terpolymer (EVM-GMA) as a polymer plasticizer replacing traditional harmful ester, was blended with EVM-GMA in melt and then cured by peroxide in a compression mold to prepare EVM-GMA/PVC blends. The results showed that with the increase of PVC, physical and mechanical properties have improved significantly. Two phases in blends formed a “sea-island” structure and the interface was blurred. Blends riched in EVM-GMA all had excellent dual shape memory properties. After removing applied force, there was only a slight recovery of the instantaneous elastic deformation and blends still retained the original temporary shape (the shape fixation was more than 99%). The shape recovery efficiency of specimen (EVM-GMA/PVC = 90/10) was the highest, which evidenced that entropy elastic effect of molecular chains and elastic restoring force provided by crosslinked structure achieved a balance at this point.

Influence of Cobalt Addition on Microstructure and Damping Properties of Cu-Al-Ni Shape Memory Alloys

2020 ◽  
Vol 1010 ◽  
pp. 34-39
Author(s):  
Ying Ci Wee ◽  
Hamidreza Ghandvar ◽  
Tuty Asma Abu Bakar ◽  
Esah Hamzah
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Elastic Anisotropy ◽  
Mechanical Analysis ◽  
Damping Capacity ◽  
Damping Properties ◽  
Additional Element ◽  
Lower Temperature ◽  
Co Addition ◽  
High Degree

Copper-based shape memory alloys (SMAs) gaining attention due to their high damping properties during martensitic transformation and effective in energy dissipation which is applicable to damping application. However, copper-based SMAs such as the ternary Cu-Al-Ni are not easily deformed in the lower temperature martensitic phase which can be attributed to brittleness induced by coarse grain size, high degree of order and elastic anisotropy. Hence, this study aims to improve the properties of Cu-Al-Ni SMAs by addition of fourth alloying element. In this research, Cu-Al-Ni alloys with the addition of the fourth additional element, cobalt were prepared by casting. Microstructure characteristics of Cu-Al-Ni SMAs with and without Co addition were investigated via scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS) and x-ray diffraction (XRD). Damping capacity was determined by dynamic mechanical analysis (DMA). It was found that the alloy with 0.7wt% of Co addition showed the best improvement on the damping properties.

Rapidly Self-Expandable Polymeric Stents with a Shape-Memory Property

2007 ◽  
Vol 8 (9) ◽  
pp. 2774-2780 ◽  
Author(s):  
Mei-Chin Chen ◽  
Hung-Wen Tsai ◽  
Yen Chang ◽  
Wei-Yun Lai ◽  
Fwu-Long Mi ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Property ◽  
Memory Property
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