2.1.2. Porous films of PE, software, PS
Porous films of PE have been received from linear polyethylene of high density with Mw = 2.5? 105, Mw∕Mn = 4-5 and melting point Tpl = 132°С.
Process of manufacturing of porous films includes a numberConsecutive stages: melt extrusion through a slot-hole spinneret at 200°С, an uniaxial stretching at ambient temperature (a stage poroobrazovanija), annealing at 130°С and thermofixation of the generated cellular structure by ageing at elevated temperature [24,172]. For the purpose of pore size increase the porous films received in the course of a cold drawing (PE-1) subjected to an additional extract at elevated temperature (hot drawing). In work porous films of PE-1, and also a film received by one (PE-2) and two (PE-3) were investigated by consecutive hot drawing at temperature 110°С. As comparative samples the monolithic films of PE received by melt extrusion through a spinneret have been used.
The general porosity of samples () measured by a gravimetric method and counted under the formula [172]:
Where r - density of the monolithic sample of PE of high density which made 950 kg/m3, rp - the density of a porous film defined by weighing. Investigated porous PE of a film had characteristics specified in tab. 2.2.
Distributions on the sizes of through channels have been measured by a method filtration porometrii and calculated on parity Puazejlja [173]. Porous films of software have been in a similar way prepared also.
Table 2.2. Characteristics of porous films of PE
Properties | PE-1 | PE-2 | PE-3 |
Thickness, micron | 17 | 13 | 8 |
The general porosity, % | 39 | 52 | 58 |
Porous films PS on a substrate from 1П1 prepared on the technology described in works [45-47]. Ready samples have been given The College of Judea and Samaria, The Research Institute, Ariel, Israel.
2.1.2.
More on topic 2.1.2. Porous films of PE, software, PS:
- 4.2. Definition of effective diameter of pores and their distribution in the sizes in porous polymeric materials
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- 2.5. Experimental researches of an expulsion mechanism of oil water from a porous medium
- the List of the used software
- 4.2.1 Hardware-software stand for conducting of tests
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- the Analysis and the software description
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- CONCLUSIONS of a software to SECTION III
- CONCLUSIONS And RECOMMENDATIONS of a software of the DISSERTATION As a whole 1.
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- thin films