Matrix polymers

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  • Vật liệu polyme nanocompozit (tiếng Anh: polymer nanocomposite) là một loại polyme compozit "mới" mà trong đó các hạt độn (filled-particles) trong mạng nền polyme (polymer matrix) có kích thước nanomet.

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  • The last RAPRA Report on Polymers in Aerospace Applications (W.W. Wright, Report 37) was published in 1990. The present report strives to provide a contemporary review of this area with an emphasis on the literature appearing after 1990. It includes coverage of new materials and technologies (particularly nanocomposites). The principal use for polymers in aerospace applications is as a matrix material and/or reinforcing  bre for composites. Other major applications include use in adhesives, anti-misting additives, coatings, elastomers,  bres, and foams...

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  • Today, nano composite material is being studied and widely used for defence security and economic development. Keeping researching on the mechanic of three-phases nano composite in which two-phases is grains of pad and the structure of one-phase in reinforced two-phases is a nano structure, basing on consideration for interaction of the polyme matrix and grains of padding, we have defined engineering constants of the three-phases polyme composite nano material.

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  • Structural and electronic transitions in polyaniline (PANI) matrix due to the presence of nickel-nanoclusters (PANI-Ni) were investigated via UV-Vis spectroscopic measurements. The obtained results indicate that there exist two populous packets of polaron (located at 872 and 973 nm) in both PANI and PANI-Ni.

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  • Polymer nanocomposites are commonly defined as the combination of a polymer matrix and additives that have at least one dimension in the nanometer range. The additives can be one-dimensional (examples include nanotubes and fibres), two-dimensional (which include layered minerals like clay), or three- dimensional (including spherical particles). Over the past decade, polymer nanocomposites have attracted considerable interests in both academia and industry, owing to their outstanding mechanical properties like elastic stiffness and strength with only a small amount of the nanoadditives.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: An antibacterial coating based on a polymer/solgel hybrid matrix loaded with silver nanoparticles

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  • In the quest for knowledge, it is not uncommon for researchers to push the limits of simulation techniques to the point where they have to be adapted or totally new techniques or approaches become necessary. True multiscale modeling techniques are becoming increasingly necessary given the growing interest in materials and processes on which large-scale properties are dependent or that can be tuned by their low-scale properties. An example would be nanocomposites, where embedded nanostructures completely change the matrix properties due to effects occurring at the atomic level.

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  • Polyurethanes are block copolymers composed of alternating short hard segments and long flexible soft segments that are thermodynamically incompatible at the temperature of use [1,2]. Phase separation of segmented polyurethanes (SPU) with a limited hard segment content results in hard segment rich domains dispersed in a continuous matrix of the soft segments [3]. The hard domains act as physical crosslink providing the polymer with mechanical strength while the soft matrix contributes to the elastomeric properties [4,5]....

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  • CHAPTER 9 COMPOSITE MATERIALS AND MECHANICAL DESIGN Carl Zweben Lockheed Martin Missiles and Space—Valley Forge Operations King of Prussia, Pennsylvania 9.1 INTRODUCTION 9.1.1 Classes and Characteristics of Composite Materials 9.1.2 Comparative Properties of Composite Materials 9.1.3 Manufacturing Considerations 9.2 REINFORCEMENTS AND MATRIX MATERIALS 9.2.1 Reinforcements 9.2.2 Matrix Materials 9.3 PROPERTIES OF COMPOSITE MATERIALS 9.3.1 Mechanical Properties of Composite Materials 9.3.

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  • Mục tiêu: Điều chế viên nén phóng thích kéo dài chứa hoạt chất tan trong nước là diltiazem hydroclorid có độ giải phóng hoạt chất đạt USP XXX. Phương pháp: Sử dụng các polyme cho viên nén phóng thích kéo dài như Kollidon SR, HPMC, Eudragit RS PO 100, Precirol ATO 5, kết hợp với phương pháp bào chế dập trực tiếp điều chế viên nén phóng thích kéo dài có cấu trúc matrix và đánh giá độ giải phóng hoạt chất theo tiêu chuẩn USP XXX. ...

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  • VIÊN NÉN PHÓNG THÍCH KÉO DÀI CHỨA NIFEDIPINE 30 mg TÓM TẮT Mục tiêu: Điều chế viên nén phóng thích kéo dài chứa hoạt chất ít tan trong nước là nifedipine có độ giải phóng hoạt chất đạt USP XXX hoặc tương đương viên đối chiếu Adalat LA 30 mg.

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  • 9.4.1 Polymer Matrix Composites There are a large and increasing number of processes for making PMC parts. Many are not very labor-intensive and can make near-net shape components. For thermoplastic matrices reinforced with discontinuous fibers, one of the most widely used processes is injection molding. However, as discussed in Section 9.3, the stiffness and strength of resulting parts are relatively low. This section focuses on processes for making composites with continuous fibers. Many PMC processes combine fibers and matrices directly.

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  • The development of concept in structural morphology lets description the location of nickel nanoclusters in conductive organic polymers, which may be a new kind of structure in conductive organic polymer composites family. As a new route, such the development was supported by electrochemical two-pot process, on which polianiline containing nanoclusters of nickel incorporated in layer by layer were prepared, in H2SO4 0.1 M solutions. The presence of nickel nanoclusters in polymer matrix and the changes in morphology were confirmed by SEM/EDS

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  • The carbon dioxide molecule becomes cluster to minimize the free energy; as a result pore nucleation is created. These pores cause the significant expansion of polymeric volume and decrease in polymeric density. A three- dimensional porous structure (scaffolds) is formed after completion of foaming process. The porosity of the scaffolds is controlled by the use of porogens like sugar, salts and wax (Ikada, 2006).

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  • The cell line, RCS-LTC (derived from the Swarm rat chondrosarcoma), deposits a copious extracellular matrix in which the collagen component is primarily a polymer of partially processed type II N-procollagen molecules. Transmission electron microscopy of the matrix shows no obvious fibrils, only a mass of thin unbanded filaments. We have used this cell system to show that the type II N-pro-collagen polymer nevertheless is stabilized by pyridinoline cross-links at molecular sites (mediated by N- and C-telo-peptide domains) found in collagen II fibrils processed nor-mally....

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