荧光染料,纳米棒双语报告

1、department of chemistry and chemical engineering,china west normal universitythe report on chemical experimentexperiment: shape recovery of shape memory dolymer based on chemicallcross-linkedpoly(vinylacohol)course: student: grade class student id: position: instructor: experiment condition: tempera

2、ture °c relative humidity: atmosphere pressure date: month day yearobjectives:1. to understand the important of the safe glass of pvb2. to grasp the synthesis procedure of pvbprinciple:shape memory have the capability to store and recover large strains in response to specific environmental stim

3、uli :temperature, ph, magnetic field and light ect, structurally ,smps are polymer networks equipped with a suitable switching structure , the net points can be physical entanglement of polymer chains or chemical cross-linking ,determining the permanent shape ,while the switching structure can be cr

4、ystalline oramorphous providing properties of primarily recovery and energyabsorption. all polymers can exhibit the shape memory effect.materials & apparatus:chemical agentspolyvinyl alcoholglutaraldehyde36%hydrogen chloride deionized waterapparatus magnetic stirrer injector beaker shape glass t

5、ubesprocedure & phenomena (including the figures of experiment devices):1、in a type experiment, 0.4 ml ga was added to 10 ml aqueous pva solution (8 wt %) with ph=4. after homogeneous stirring, the mixture was injected into certain shaped glass tubes, with a diameter of 5 mm. the cross-linking r

6、eaction was conducted for 36 h at room temperature (25 °c).2、the sample was washed with deionized water to remove the catalytic hc1; and then it was dried for 48 h at room temperature in air and under vacuum.experiment records & datawe can see the phenomenon that after the experiment, the t

7、ransparent material was gotten.experimental results:the transparent material was gotten.discussions:(1) what effect is the hydrogen chloride?answer: adding hydrogen chloride, in order to modify the ph value of mixture to an acid degree, prompt the mixture forms colloidal substance (2) what is meaning of the glass transition temperature?answer: polymer by high elastic state into glass state temperature, refers to the amorphous polymer (including an amorphous part of the crystalline polymer) from the glassy state to the high elastic state or by the latter to the former transition temperat