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Determination method for interfacial tension of phase-separated polymer blend

A technology of blending polymers and measurement methods, which is applied in the direction of surface tension analysis, etc., can solve the problems of unsystematic research and reporting of interfacial tension measurement, and achieve the effect of wide application range and simple sample preparation method

Active Publication Date: 2013-12-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is still no systematic study and report on the interfacial tension measurement of partially compatible phase-separated polymer blends

Method used

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  • Determination method for interfacial tension of phase-separated polymer blend
  • Determination method for interfacial tension of phase-separated polymer blend
  • Determination method for interfacial tension of phase-separated polymer blend

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Determination of the interfacial tension of phase-separated polybutadiene (PB) / polyisoprene (PI) (30wt / 70wt) blend polymers at 110℃

[0047] (1) Preparation of PB / PI blend polymer.

[0048] PB and PI are provided by Yanshan Branch of Sinopec Beijing Research Institute of Chemical Industry. Its basic parameters are as follows:

[0049]

[0050] PB and PI were dissolved in dichloromethane to prepare a polymer solution with a weight fraction of 3.22%, wherein the weight ratio of PB and PI was 30:70. The above polymer solution was filtered using a Millpore filter membrane with a pore size of 0.45 μm. The filtrate was stirred with a stirrer at room temperature at a stirring rate of 500 rpm. After the dichloromethane solvent in the filtrate was naturally volatilized, it was transferred to a vacuum oven to continue to remove the remaining small amount of solvent. The oven temperature was set to 35°C, and it stayed in the vacuum oven for 1-3 days until the sample had a cons...

Embodiment 2

[0059] Determination of interfacial tension of phase-separated PB / PI (20wt / 80wt) blend polymers at 110℃

[0060] (1) Preparation of PB / PI (20wt / 80wt) blend polymer.

[0061] The polymers PB and PI used and the preparation of the polymer blend were the same as in Example 1.

[0062] (2) Two-phase structure and zero shear viscosity of PB / PI (20wt / 80wt) blend polymer at 110℃

[0063] The two-phase structure of PB / PI (20wt / 80wt) blend polymer annealed at 110℃ for 180min was characterized by Olympus BX51 phase contrast microscope with Linkam LTS350 temperature-controlled heating stage and Olympus C-5050ZOOM digital camera image acquisition system. The results are as follows Figure 5 shown. The bright spherical droplets in the figure are the PB-rich phase, which constitutes the dispersed phase; the continuous phase is the dark-colored PI-rich phase. right Figure 5 Using Image J (NIH) image processing software, the volume-averaged droplet radius after annealing for 180 min was ...

Embodiment 3

[0067] Determination of the interfacial tension of styrene-maleic anhydride copolymer (SMA) / polymethyl methacrylate (PMMA) (15wt / 85wt) blend polymer at 220℃

[0068] (1) Preparation of SMA / PMMA blend polymer.

[0069] The mole fraction of maleic anhydride in SMA is 16%, produced by Nanjing Yinxin Chemical Co., Ltd.; PMMA is produced by BASF. The basic parameters of the two samples are as follows:

[0070]

[0071]

[0072] The SMA and PMMA samples were dried in a vacuum oven at 85°C for 12 hours before mechanical blending. The SMA and PMMA were uniformly mixed at a weight ratio of 15:85, and then added to a pre-heated HaakePolylab OS internal mixer for blending. The blending temperature was 180° C. and the rotational speed was 50 rpm. The mixing process continued until the rheometer torque no longer changed. The polymer blend obtained above was hot-pressed at 180° C. for 60 min, and finally a disk-shaped sample with a diameter of 25 mm and a thickness of 1.5 mm was pr...

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Abstract

The invention relates to a determination method for interfacial tension of a phase-separated polymer blend. The method comprises steps of preparing a polymer blend from two partially-mixable polymers through solution blending or mechanical blending; after the polymer blend is added into a commercial rheometer, heating up or cooling to a measurement temperature to perform annealing treatment with the measurement temperature being the temperature at which phase separation of the polymer blend generates; determining a linear viscoelastic region of the liquid-drop polymer blend having a structure of a "sea-island" shape by utilization of dynamic rheological measurement; subjecting a dynamic frequency scanning test to the polymer blend in the linear viscoelastic region; converting a dynamic frequency scanning curve obtained into a relaxation time spectrum with the time corresponding to the peak value of the relaxation time spectrum being the characteristic relaxation time of liquid drops; and obtaining the interfacial tension of two phases of the polymer blend by utilization of an incidence formula combining the characteristic relaxation time and the interfacial tension.

Description

technical field [0001] The invention relates to a method for measuring the interfacial tension, in particular to a method for measuring the interfacial tension of a phase-separated blended polymer. Background technique [0002] Blending and modifying two (or more) polymers to complement each other in performance or achieve synergistic effects is an important way to prepare high-performance polymer materials, and has been widely used in the industrial sector. After the polymer composition is determined, the properties of the blended material will depend on the phase morphology. An important physical quantity that affects the phase morphology of the polymer blend is the interfacial tension. Therefore, establishing and inventing more accurate and convenient methods and means to measure the interfacial tension of polymers has always been the goal that people are striving for. [0003] The measurement methods of interfacial tension of polymer blends can be roughly divided into ...

Claims

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Application Information

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IPC IPC(8): G01N13/02
Inventor 邹发生董侠韩志超
Owner INST OF CHEM CHINESE ACAD OF SCI
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