*2(1) 2-04-11 received, 2(1) 2-06-01 revised; nationally funded; title (item 901303535) funded; communication contact results show that PS component viscosity in non-polar high polymer (PS) content The place.

Under the condition of thin film, due to the strong effect of the substrate, many new phenomena are continuously discovered for polymer complex systems. These phenomena are different from those usually found in bulk. However, there are still many concepts that are unclear and need to be explored. Therefore, in-depth study of the interaction between the substrate and the blend, it is very important to understand the dynamic behavior of the polymer molecules in the film under the conditions of the substrate and limited dimensions. This is of great value for the application of thin film materials in the fields of structural materials and surfaces and optoelectronic functional materials.

In this paper, polystyrene (PS) polymethyl methacrylate (PMMA) and polystyrene (PS) poly-e-caprolactone (PCL) systems were selected. After the film was coated on the glass substrate, the SpinCoating was annealed. In the process of annealing, the polarity of the polar polymer under the action of the glass substrate is the low-phase phase morphology of the blend film. In addition, by changing the molecular weight of PS and PCL blending, the effect of component viscosity on the morphology of the film phase was studied.

: 3 SEM photographs and elemental analysis results of the initial and final phase morphology of the film annealing.

Since PMMA contains oxygen and PS does not contain oxygen, the carbon (C) and oxygen (O) elements in each microdomain can be analyzed by line scan to determine the composition of the dispersed and continuous phases. The ordinate of the spectrum is the carbon or oxygen content, and the abscissa corresponds to the line in the SEM image, indicating the distance.

In the early stage of film annealing at the polymer journal, the white disperse phase was observed in the black continuous phase under the phase-contrast microscope. (b) The corresponding SEM photograph (a) and the result of the halogen analysis (b) showed that when the scanning line passes through In the continuous phase (black phase) on the photo, the peak of C in the spectrum is very strong, indicating that the C content is very high at this time, but the O content is very low; when the scan line passes through the dispersed phase (white phase) on the photo, The peak of O in the spectrum is significantly increased, while the peak of C is significantly reduced. This shows that the black continuous phase at this time is the enrichment phase of PS, while the white dispersed phase is the PMMA enrichment phase.

The final phase morphology of the film (a) is a black disperse phase that is distributed in the white continuous phase. Using the line scan elemental analysis (b), it is found that when the scanning line passes through the disperse phase (black phase) on the photo, the spectrum appears clearly The peak of C, but the content of O at this time is very low; when the scan line passes through the continuous phase (white phase) on the photograph, the content of O element in the spectrum is obviously increased, and the content of C element is significantly reduced. This shows that the PMMA enrichment phase has become a white continuous phase, while the black PS enrichment phase is a dispersed phase. A small part of the spectrum (b) shows that the contents of C and O are very high. This is because the phase separation of the two polymers is not complete at the initial stage of annealing. In some locations, PMMA and PS are still present to some extent. Mixed. However, in the spectrum (b), the contents of C and O elements in (b) are not found to be very high. It is considered that due to the incompatibility of the two polymers, the PS and the PMMA gradually separate completely after long-time annealing. There has been no case where two polymers are mixed with each other.

Through the structure, a layer of PMMA is enriched at the substrate interface, and a spherical PS domain floats above the PMMA spreading phase.

2.2 PS/PCL system film phase morphology development process in the study of the PS / PMMA film system found that in the annealing process, the low-component in the blend can evolve into a continuous stick structure of the reverse of such a fact. From this we conclude that the effect of the substrate has an important influence on the final phase morphology of the blend film. The strength of the wettability of the component on the substrate can determine whether the component becomes a dispersed or continuous phase in the film. Within a certain range is independent of the proportion of the components. In order to verify the universality of this rule, we also studied the PS/PCL film system as a proof of the above viewpoint.

Through, the initial phase of annealing of the continuous phase and the dispersed phase of the blend film is basically determined by the ratio of component blending, ie when PCL is a low component, PCL is a dispersed phase and PS is a continuous phase. However, during the annealing process, PCL and the glass substrate have good wettability, resulting in the PCL quickly spreading on the surface of the glass substrate and simultaneously arching the PS phase. In the end, PCL forms a layer of infiltrated film, and PS Mandarin floats on it. Due to the surface tension, the PS phase eventually shrinks and condenses into a spherical shape.

For the other proportions of the ps/pcl system, annealing heat treatment was also performed. In the process of gradual spreading of PCL, many small white particles are slowly and differently. It shows that the viscosity of the components has a great influence on the diffusion of the molecules and the speed of the phase morphology of the blend films.

The intrinsic viscosity of PS is approximately the same when the intrinsic viscosity is 85 gmL, but in summary, (1) through the process of the development of the phase morphology of the polymer blend under the influence of the glass substrate of PS MMA blend film, etc. Chinese Journal of Chemical Chemistry, 2001: