智能材料英文PPT

1、2021/3/10讲解：XX1 高材03班 余函 帅婉华 2021/3/10讲解：XX2 Main content Overview of smart polymer materials Classification and application of smart polymer materials Outlook of smart polymer materials 2021/3/10讲解：XX3 2021/3/10讲解：XX4 Intelligent material : It is also known as smart material, which has the function

2、 of perception, self diagnosis, self adaptation and self repair. Features:polymer materials integrating perception, driver and information processing, to form an intelligent properties similar to the biological material. 2021/3/10讲解：XX5 Biological function of the Intelligent materials Have feedback

3、system Information accumulation and recognition function Learning ability and predictive function Response function Self repairing function Self diagnostic function Dynamic balance and adaptive function 2021/3/10讲解：XX6 A material system with the form of the above structure, it may be reflected of th

4、e following characteristics: With sensing capabilities, can detect the outside world (or internal) of the stimulus intensity With information transfer function, to set up the optimal way to choose and control response Function of response and execution to the environmental transformation Sensitive r

5、esponse The external stimulus can quickly return to the original state. 2021/3/10讲解：XX7 Intelligent material Intelligent metal materials Intelligent inorganic non metallic materials Intelligent polymer materials advantanges Multi level structure Weak intermolecular forcesSide chain is easy to introd

6、uce functional groups Facilitate molecular design and fine control Easy coating Conducive to the perception of the environment to achieve environmental response 2021/3/10讲解：XX8 Classification of intelligent polymer materials Smart polymer gel Shape memory polymer materials Intelligent polymer compos

7、ites 2021/3/10讲解：XX9 Definition of polymer gels nThe gel is between liquid and solid material form . Polymer gel is made up of molecules between three-dimensional crosslinked network, its network consists of the macromolecular main chain and side chain with hydrophilic groups (polarity) and hydropho

8、bic groups, or (and) dissociative group, solvent was fixed in the molecular network. nAlthough solvent can not be dissolved the three dimensional network structure of polymer, but high molecular compound solvent affinity groups part can through solvent effect and make the polymer swelling, this also

9、 is one of the reasons for the formation of polymer gel. 2021/3/10讲解：XX10 Definition of polymer gels Three dimensional network structure of polymer gels The system of three-dimensional polymer network and solvent Solvent swelling, which can be solvent swelling Biggest feature: volume phase transitio

10、n The polymer gel, which can be chemically bonded, can be chemically and physically cross-linked. 2021/3/10讲解：XX11 Classification of polymer gels According to the classification of solvent in the polymer network: Polymer gel Hydrogel Organic gel 2021/3/10讲解：XX12 lHydrogels are the most common and on

11、e of the most important polymer gels. The vast majority of creatures, the presence of natural plant gel and many synthetic polymer gel are belong to the hydrogel. And biological gel have excellent intelligence and high strength. lIntelligent hydrogel is a kind of hydrogel which can produce sensitive

12、 response to external stimuli. lHydrogels can absorb hundreds of times beyond the weight of water,so it is also used in health materials. Classification of polymer gels 2021/3/10讲解：XX13 The volume phase transition of gel: Gel equilibrium swelling volume changes with the changes of the environment. S

13、welling phase Contraction phase Environmental factors change Volume discontinuity Internal cause: Fan Dehua force, hydrogen bond, hydrophobic interaction and electrostatic force. 2021/3/10讲解：XX14 Preparation of smart polymer gels Starting material Monomer (water soluble or oil soluble monomer) Polym

14、ers (natural or synthetic polymers) Mixtures of monomers and polymers Two premises: The main chain or side chain with a large number of Pro solvent groups Appropriate crosslinking network structure Preparation method: Crosslinking polymerization of monomers Graft copolymerization Chemical initiator

15、Radiation technology Free radical polymerization or copolymerization Monomer smart polymer gels Other cross-linking or transformation, etc. Olefin monome r Covalent attachmentNatural polymer (starch cellulose) and its derivatives 2021/3/10讲解：XX15 Application of polymer gel Chemical film and chemical

16、 valve l For intelligent large molecules, their conformation can be changed due to the small changes in the external conditions, and the change may be lost due to the disappearance of the change of external conditions. l It is based on this kind of controllable conformational change of intelligent m

17、acromolecule, which is designed and produced a variety of molecular weight which can be controlled to separate membrane. l For example, at the end of disulfide bond poly L2 glutamic acid grafted onto a polycarbonate membrane pore structure, the use of this molecule in the low pH conformation shrinka

18、ge, high pH conformation stretching controlling membrane pore size. Experiments show that the membrane water permeability dependence on the pH of the solution and changes in the ionic strength of the solution will also affect the water permeability, with the increase of the ionic strength, water per

19、meability on the pH dependence decreases. 2021/3/10讲解：XX16 chemical mechanical device v Different hydrogel composite, making a wide variety of chemical mechanical devices. When stimulated, these materials can be bent into a predetermined shape, when the stimulus disappears, the material is returned

20、to the original shape. v For example, the PNIPAM gel was modified at four equally spaced points on a temperature insensitive PAM gel. At room temperature, the composite material is shaped in a straight line, but when the temperature rises, composite gel in the PNIPAM modified at began to bend, formi

21、ng a pentagonal, then continue to bend so as to form a square pattern, cooling, reverse bending process, materials and recovery is a linear type. According to this, the design and manufacture of the gel hand and other gel device can be grabbed. Application of polymer gel 2021/3/10讲解：XX17 drug control release To smart polymer materials as the basis, it can make the drug release system intelligence, drug is released when needed, otherwise not be released. The characteristic