A Glass Transition Model for Shape Memory Polymer and Its Composite

Zhou, Bo; Liu, Yanju; Lan, Xin; Leng, Jinsong; Yoon, Sungho

doi:10.1142/s0217979209060762

Cited by 38 publications

(36 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[13][14][15] Previous research work also indicates that the polymers modied via hybridization method usually have higher strength, better stiffness, and some special characteristics which can offer further advantages over SMPs. 16,17 In general, chemical hybridization is better than physical blending due to ne dispersion and improved interfaces between polymers and llers. 18,19 The llers modied by chemical hybridization can achieve multifunctional crosslinking with polymers, thereby enhancing the rubber elasticity and strain recovery.…”

Section: 10mentioning

confidence: 99%

Synergistic effects of zwitterionic segments and a silane coupling agent on zwitterionic shape memory polyurethanes

Zhang

Ren

et al. 2017

RSC Adv.

View full text Add to dashboard Cite

Recently, zwitterionic shape memory polyurethanes (ZSMPUs) have found many promising applications in smart biomedical field. This paper provides a novel strategy to improve shape memory properties of ZSMPUs by using a silane coupling agent, namely 3-glycidyloxypropyl-trimethoxysilane (KH560). The synergistic effects of zwitterionic segments and silane coupling agents on the structure, morphology, thermal properties, mechanical properties, and shape memory properties were carefully investigated.The results demonstrate that the incorporation of KH560 does not influence the original molecular structure and morphology of ZSMPUs, and the KH560-modified ZSMPUs form a hard-soft phase separation structure. Also, the KH560 modification promotes the entanglement of hard segments, and thus provides better mechanical properties to ZSMPUs-KH560. Moreover, the silane coupling agent can provide lubrication to influence the aggregation of soft segments while the zwitterionic segments promote the formation of crystal seeds. Therefore, a good semi-crystalline soft phase endows the ZSMPUs-KH560 with a decent shape fixity (e.g. above 94%), and the entangled hard segments greatly enhance the shape recovery of ZSMPUs (e.g. above 90%).

show abstract

Section: 10mentioning

confidence: 99%

Synergistic effects of zwitterionic segments and a silane coupling agent on zwitterionic shape memory polyurethanes

Zhang

Ren

et al. 2017

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…Based on Ref. [13], E can be defined mathematically as follows Definition 4.1 (Elastic Weighting Factor, E) E is a value such that E decreases as the distance is getting closer, which means that the elastic modulus of the structure decreases. This makes the structure more flexible.…”

Section: Shape Memory Polymer Modelingmentioning

confidence: 99%

Formation Flight and Collision Avoidance for Multiple UAVs using Concept of Elastic Weighting Factor

Kang¹,

Choi²,

Kim³

2013

International Journal of Aeronautical and Space Sciences

View full text Add to dashboard Cite

In this paper, the guidance law for formation flight and collision avoidance of multiple Unmanned Aerial Vehicle (UAV)s is proposed. To construct the physically comprehensible guidance law for formation flight, the virtual structure approach is used. To develop a guidance law for collision avoidance considering both other UAVs and unknown static obstacles, a geometric approach using information such as a relative position vector is utilized. Through the Lyapunov theorem, the stability of the proposed guidance law is proved. To combine guidance commands, the concept of the elastic weighting factor inspired by the elastic behavior of shape memory polymer, which tends to regain its original shape after deformation, is introduced. By using the concept of elastic weighting factor, multiple UAVs are able to cope actively with the situation of a collision between both UAVs and static obstacles during the formation flight. To verify the performance of the proposed method, numerical simulations are performed.

show abstract

“…Establishing the material parameter function which describes the relationship between the temperature and material parameters is the basis for predicting the thermo-mechanical behaviors associated with respect to the shape memory effect occurring in a SMP. Zhou et al [14] investigated the glass transition behaviors of SMPs through a DMA test, and defined three critical transition temperatures: transition starting temperature, transition peak temperature and transition finishing temperature, which can be determined from the curve of the derivative of the elastic modulus with respect to temperature. They established a cosine-type material parameter function to describe the relationship between material parameters and temperature of the SMP.…”

Section: Materials Parameter Functionmentioning

confidence: 99%

“…This model effectively explains the micromechanism of SMP's shape memory effect. In 2009, Zhou et al [14] experimentally investigated the process of SMP's glass transition between its rubbery state and glass state, and established a glass transition model to describe its glass transition behaviors. In 2009, Zhou et al [15] developed a UMAT function of SMP which can be called by the finite element method software of ABAQUS, and numerically simulated the thermo-mechanical behaviors of SMP by using ABAQUS coupled with the developed UMAT function.…”

Section: Introductionmentioning

confidence: 99%

A macro-mechanical constitutive model for shape memory polymer

Zhou

Liu

Leng

2010

Sci. China Phys. Mech. Astron.

Self Cite

View full text Add to dashboard Cite

It is of theoretical and engineering interest to establish a macro-mechanical constitutive model of the shape memory polymer (SMP), which includes the mechanical constitutive equation and the material parameter function, from the viewpoint of practical application. In this paper, a new three-dimensional macro-mechanical constitutive equation, which describes the mechanical behaviors associated with the shape memory effect of SMP, is developed based on solid mechanics and the viscoelasticity theorem. According to the results of the DMA test, a new material parameter function is established to express the relationship of the material parameters and temperature during the glass transition of SMP. The new macro-mechanical constitutive equation and material parameter function are used to numerically simulate the process producing the shape memory effect of SMP, which includes deforming at high temperature, stress freezing, unloading at low temperature and shape recovery. They are also used to investigate and analyze the influences of loading rate and temperature change rate on the thermo-mechanical behaviors of SMP. The numerical results and the comparisons with Zhou's material parameter function and Tobushi's mechanical constitutive equation illustrate that the proposed three-dimensional macro-mechanical constitutive model can effectively predict the thermo-mechanical behaviors of SMP under the state of complex stress.shape memory polymer, shape memory effect, mechanical constitutive equation, material parameter function PACS: 46.35.+z, 46.05.+b, 46.25.Hf

show abstract

A Glass Transition Model for Shape Memory Polymer and Its Composite

Cited by 38 publications

References 9 publications

Synergistic effects of zwitterionic segments and a silane coupling agent on zwitterionic shape memory polyurethanes

Synergistic effects of zwitterionic segments and a silane coupling agent on zwitterionic shape memory polyurethanes

Formation Flight and Collision Avoidance for Multiple UAVs using Concept of Elastic Weighting Factor

A macro-mechanical constitutive model for shape memory polymer

Contact Info

Product

Resources

About