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Fabrication of Highly Anisotropic and Interconnected Porous Scaffolds to Promote Preosteoblast Proliferation for Bone Tissue Engineering

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Chinese Journal of Polymer Science 2021年第9期39卷 1191-1199页

作者： Ya-Hui Liu Wei Liu Zi-Li Zheng Xin Wei Nouman Ali Shah Hao Lin Bai-Song Zhao Shi-Shu Huang Jia-Zhuang Xu Zhong-Ming Li college of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China Department of Anesthesiology Guangzhou Women and Children's Medical CenterGuangzhou 510623China Department of Orthopaedic Surgery West China HospitalSichuan UniversityChengdu 610065China

Mimicking the complex structure of natural bone remains a challenge for bone tissue *** this study,a novel processing strategy was developed to prepare the bone-like scaffolds that are featured by highly oriented and fully interconnected *** type of biomimetic scaffolds was evolved from solid phase stretching of immiscible polycaprolactone(PCL)/poly(ethylene oxide)(PEO)blends with cocontinuous structure and the pore morphology was inherited from selective extraction of water soluble PEO *** pore anisotropy was readily tuned by varying the stretching strain without loss of *** promotion in preosteoblast proliferation,alkaline phosphatase activity and osteogenic gene expression was observed in the oriented porous scaffolds compared to the isotropic porous *** oriented architecture provided a topographical cue for aligned growth of preosteoblasts,which activated the Wnt/β-catenin signaling *** proposed strategy enriches the toolbox for the scaffold design and fabrication for bone tissue engineering.

关键词： Porous scaffold Pore anisotropy Polymer blend co-continuous structure Tissue engineering

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Preparation of Polylactide/Poly(ether)urethane Blends with Excellent Electro-actuated Shape Memory via Incorporating Carbon Black and Carbon Nanotubes Hybrids Fillers

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Chinese Journal of Polymer Science 2018年第10期36卷 1175-1186页

作者： Yuan Wei Rui Huang Peng Dong Xiao-Dong Qi Qiang Fu college of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University

In this work, hybrid conductive fillers of carbon black （CB） and carbon nanotubes （CNTs） were introduced into polylactide （PLA）/thermoplastic poly（ether）urethane （TPU） blend （70/30 by weight） to tune the phase morphology and realize rapid electrically actuated shape memory effect （SME）. Particularly, the dispersion of conductive fillers, the phase morphology, the electrical conductivities and the shape memory properties of the composites containing CB or CB/CNTs were comparatively investigated. The results suggested that both CB and CNTs were selectively localized in TPU phase, and induced the morphological change from the sea-island structure to the co-continuous structure. The presence of CNTs resulted in a denser CB/CNTs network, which enhanced the continuity of TPU phase. Because the formed continuous TPU phase provided stronger recovery driving force, the PLA/TPU/CB/CNTs composites showed better shape recovery properties compared with the PLA/TPU/CB composites at the same CB content. Moreover, the CB and CNTs exerted a synergistic effect on enhancing the electrical conduetivities of the composites. As a result, the prepared composites exhibited excellent electrically actuated SME and the shape recovery speed was also greatly enhanced. This work demonstrated a promising strategy to achieve rapid electrically actuated SME via the addition of hybrid nanoparticles with self-networking ability in binary PLA/TPU blends over a much larger composition range.

关键词： Polymer composites Shape memory polymer co-continuous structure Self-networking behavior Hybrid filler

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Fabrication and performance of 3D co-continuous magnesium composites reinforced with Ti_(2)AlN_(x) MAX phase

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International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1406-1412页

作者： Wantong Chen Wenbo Yu Pengcheng Zhang Xufeng Pi Chaosheng Ma Guozheng Ma Lin Zhang Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China National Key Lab for Remanufacturing Army Academy of Armored ForcesBeijing 100072China China Academy of Machinery Science and Technology Group co. Ltd.Beijing 100044China

Magnesium composites reinforced by N-deficient Ti_(2)AlN MAX phase were first fabricated by non-pressure infiltration of Mg into three-dimensional(3D)co-continuous porous Ti_(2)AlN_(x)(x=0.9,1.0)*** relationship between their mechanical properties and micro-structure is discussed with the assessment of 2D and 3D characterization.X-ray diffraction(XRD)and scanning electron microscopy detected no *** 3D reconstruction shows that the uniformly distributed pores in Ti_(2)AlN_(x) preforms are interconnected,which act as infiltra-tion tunnels for the melt *** compressive yield strength and microhardness of Ti_(2)AlN_(0.9)/Mg are 353 MPa and 1.12 GPa,respectively,which are 8.55%and 6.67%lower than those of Ti_(2)AlN/Mg,*** typical delamination and kink band occurred in Ti_(2)AlN_(x) under compressive and Vickers hardness(V_(H))*** to the continuous skeleton structure and strong interfacial bonding strength,the crack ini-tiated in Ti_(2)AlN_(x) was blocked by the plastic Mg *** suggests the possibility of regulating the mechanical performance of Ti_(2)AlN/Mg composites by controlling the N vacancy and the hierarchical structure of Ti_(2)AlN skeleton.

关键词： Ti_(2)AlN magnesium matrix composites co-continuous structure Nvacancy

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Membrane Designing For Membrane Distillation Process

Membrane Designing For Membrane Distillation Process

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第十五届中国水论坛

作者： WANG Ziyi TANG Yuanyuan LI Bao'an School of Environmental Science and Engineering South University of Science and Technology School of Environmental Science and Engineering

With excellent permeability as the foremost requirement for membrane used in membrane distillation（MD） process, the co-continuous structure is identified as the best morphology of porous membrane for permeation. Since hydrophobicity is a basic requirement for membrane used in MD process, the membrane wetting and fouling can be effectively alleviated with superhydrophobic surface. In this study, the binary diluent was employed to generate the porous polyvinylidene fluoride（PVDF） hollow fiber membrane with co-continuous structure. A facile method was introduced for superhydrophobic coating with papillae-like structure on PVDF membrane surface. The original membrane with co-continuous structure exhibits narrow pore size distribution and excellent permeability. The MD flux, wetting and fouling resistance were significantly enhanced after superhydrophobic modification. This study proposed a promising strategy to design PVDF membrane with co-continuous structure and improve the performance of PVDF membrane in the MD process.

关键词： Membrane distillation PVDF membrane co-continuous structure Superhydrophobic surface

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原位反应加工制备BN/CF混杂填充PP/PS复合材料的导热性能研究

原位反应加工制备BN/CF混杂填充PP/PS复合材料的导热性能研究

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2019树脂基复合材料学术研讨会

作者：周聪马鹏飞郭文文江学良游峰湖北省等离子体化学与新材料重点实验室武汉工程大学材料科学与工程学院

＜正＞导热及电绝缘聚合物复合材料一直以来都是热管理领域的研究热点并且有着良好的应用和发展前景。提升复合材料导热系数的方法主要有加入各种导热填料[1-2]、对填料或基体表面改性[3-4]以及材料内部导热结构的设计[5-6]等。然而由... 详细信息

＜正＞导热及电绝缘聚合物复合材料一直以来都是热管理领域的研究热点并且有着良好的应用和发展前景。提升复合材料导热系数的方法主要有加入各种导热填料[1-2]、对填料或基体表面改性[3-4]以及材料内部导热结构的设计[5-6]等。然而由于填料与高分子之间存在无法消除的界面热阻,它们分别对复合材料导热性能的提升都有着一定的局限性。为了更好地提高导热系数,结合以上几种主要方法的优点,使导热填料得到充分地利用,才是我们的研究重点,也是构建高导热聚合物复合材料导热途径的关键[7]。因此,我们提出一种简便的方法,通过反应性加工以及双逾渗结构设计[8],将BN和CF选择性的选择性地分散在聚苯乙烯（PS）相中,另一基体相为聚丙烯（PP）,制备出了导热性能提升可观的导热复合材料。

关键词： In-situ reactive processing Thermal conductivity co-continuous structure Polymer composites

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