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1、,Intelligent polymer materials,高材03班 余函 帅婉华,Main content,Intelligent material:It is also known as smart material,which has the function of perception,self diagnosis,self adaptation and self repair.,Features:polymer materials integrating perception,driver and information processing,to form an intelli
2、gent properties similar to the biological material.,Biological function of the Intelligent materials,Have feedback systemInformation accumulation and recognition functionLearning ability and predictive functionResponse functionSelf repairing functionSelf diagnostic functionDynamic balance and adapti
3、ve function,A material system with the form of the above structure,it may be reflected of the following characteristics:,With sensing capabilities,can detect the outside world(or internal)of the stimulus intensityWith information transfer function,to set up the optimal way to choose and control resp
4、onseFunction of response and execution to the environmental transformationSensitive responseThe external stimulus can quickly return to the original state.,Intelligent material,Intelligent metal materials,Intelligent inorganic non metallic materials,Intelligent polymer materials,advantanges,Multi le
5、vel structureWeak intermolecular forcesSide chain is easy to introduce functional groupsFacilitate molecular design and fine controlEasy coating,Conducive to the perception of the environment to achieve environmental response,Classification of intelligent polymer materials,Smart polymer gelShape mem
6、ory polymer materialsIntelligent polymer composites,Definition of polymer gels,The 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 gro
7、ups(polarity)and hydrophobic groups,or(and)dissociative group,solvent was fixed in the molecular network.Although 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 s
8、welling,this also is one of the reasons for the formation of polymer gel.,Definition of polymer gels,Three dimensional network structure of polymer gels,The system of three-dimensional polymer network and solventSolvent swelling,which can be solvent swellingBiggest feature:volume phase transition,Th
9、e polymer gel,which can be chemically bonded,can be chemically and physically cross-linked.,Classification of polymer gels,According to the classification of solvent in the polymer network:,Polymer gel,Hydrogel,Organic gel,Hydrogels are the most common and one of the most important polymer gels.The
10、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.Intelligent hydrogel is a kind of hydrogel which can produce sensitive response to external stimuli.Hydrogels can ab
11、sorb hundreds of times beyond the weight of water,so it is also used in health materials.,Classification of polymer gels,The volume phase transition of gel:Gel equilibrium swelling volume changes with the changes of the environment.,Swelling phase,Contraction phase,Environmental factors change,Volum
12、e discontinuity,Internal cause:Fan Dehua force,hydrogen bond,hydrophobic interaction and electrostatic force.,Preparation of smart polymer gels,Starting materialMonomer(water soluble or oil soluble monomer)Polymers(natural or synthetic polymers)Mixtures of monomers and polymersTwo premises:The main
13、chain or side chain with a large number of Pro solvent groupsAppropriate crosslinking network structurePreparation method:Crosslinking polymerization of monomersGraft copolymerization,Chemical initiatorRadiation technology,Free radical polymerization or copolymerization,Monomer,smart polymer gels,Ot
14、her cross-linking or transformation,etc.,Olefin monomer,Covalent attachment,Natural polymer(starch cellulose)and its derivatives,Application of polymer gel,Chemical film and chemical valveFor intelligent large molecules,their conformation can be changed due to the small changes in the external condi
15、tions,and the change may be lost due to the disappearance of the change of external conditions.It is based on this kind of controllable conformational change of intelligent macromolecule,which is designed and produced a variety of molecular weight which can be controlled to separate membrane.For exa
16、mple,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 shrinkage,high pH conformation stretching controlling membrane pore size.Experiments show that the membrane water permeability dependence o
17、n 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 permeability on the pH dependence decreases.,chemical mechanical deviceDifferent hydrogel composite,making a wide variety of chemical mecha
18、nical devices.When stimulated,these materials can be bent into a predetermined shape,when the stimulus disappears,the material is returned to the original shape.For example,the PNIPAM gel was modified at four equally spaced points on a temperature insensitive PAM gel.At room temperature,the composit
19、e material is shaped in a straight line,but when the temperature rises,composite gel in the PNIPAM modified at began to bend,forming 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
20、and manufacture of the gel hand and other gel device can be grabbed.,Application of polymer gel,drug control releaseTo smart polymer materials as the basis,it can make the drug release system intelligence,drug is released when needed,otherwise not be released.The characteristics of this system integ
21、rating drugs and whether agents on their own judgment,set of sensing,processing and executive function in a body,it can signal a change in the perceived disease caused by chemical and physical quantities,pharmaceutical according to this response to the signal from the feedback and release drug or te
22、rmination of the release.In fact,the smart type of large molecules and large molecular hydrogels for biomedical applications are more reflected in the drug immobilization and controlled release.,Application of polymer gel,With the development of material science,the smart polymer material has broad development space and application prospect.,THANK YOU!,