Temperature is one of the laboratory environmental conditions and requires constant temperature and humidity in the test environment unless otherwise specified. For high molecular polymers, temperature changes can have a significant impact on the properties of the material, and this effect varies with the specific material properties, can not be unified, requires specific analysis. An important part of the material's breathability database being developed by Languang Lab is to measure the oxygen permeability of various materials from cryogenic to high temperature. Experts have recently introduced the "polycarbonate oxygen permeability test data". Polycarbonate (PC) is a generic term for a class of polymer compounds containing a carbonate in a molecular chain, and is also a polyester. Bisphenol a polycarbonate is one of the most productive and versatile polycarbonates and one of the fastest growing engineering plastics.

Bisphenol a-type polycarbonate has excellent impact strength, creep resistance, heat resistance and cold resistance, and can be used in the temperature range of -100 to 140 ° C, and the transmittance of visible light can reach about 90%. High tensile strength, flexural strength, elongation and rigidity, excellent aging resistance, electrical properties, low water absorption, but poor oil resistance, abrasion resistance and processing properties. According to experts, polycarbonate is widely used in automotive, electrical and electronic, construction machinery, office automation equipment, packaging, sports equipment, health care and household goods. What is the detection technology of polycarbonate oxygen permeability detection data? The standard test environment for material permeability required in the standard is 23 °C. Since the detecting device does not have a temperature control function, or its detecting element cannot be used under too high or too low temperature conditions, the usual gas permeability detecting device can only be used in the vicinity of room temperature or a slightly larger temperature range. For non-temperature-controlled testing equipment, temperature control can only be achieved by adjusting the temperature of the test chamber. Even if the equipment has temperature control function, the actual test temperature that can be provided is often limited to between 0 °C and 50 °C.

Although there are certain practical testing requirements for the gas permeability test of materials at other special temperatures, the temperature range requirements are not consistent, and some need to be tested at -5 ° C (for example, if the vegetables are fresh), but some also need to be Temperatures of -30 ° C or lower, and temperature control of specific temperatures and detection of material permeability are currently commercially difficult to achieve and are very costly. In order to meet these special testing needs, and to facilitate the researcher's permeability coefficient of the material, there is a general understanding of the temperature change, LabthinkVaC-V1 based on the realized temperature control from room temperature to 50 °C, and these actual test data Based on the description of the influence of temperature in the classical membrane technology, the data fitting function for obtaining various parameters of the permeability performance at different temperatures is provided. Experts say that curve fitting (CurveFitting) is a data processing method that approximates a continuous curve or a function relationship between the coordinates represented by discrete points on a plane. It uses an analytical expression to approximate discrete data. a way. In scientific experiments or social activities, a set of data x (y, yi) (i = 1, 2, ... m) is obtained by experiment or observation, wherein each xi is different from each other. It is desirable to use a analytic expression that fits the background material law of the data, y = f(x, c) to reflect the dependence between the quantity x and y, that is, "best" approximation in a certain sense or Fit known data.

f(x,c) is often referred to as a fitting model, where c=(c1, c2, ... cn) is some pending parameter. When c appears linearly in f, it is called a linear model, otherwise it is called a nonlinear model. There is not necessarily a linear relationship between variables in actual work, so the most commonly used method for better analysis of various data is to perform curve fitting. The LabthinkVaC-V1 gas permeation instrument adopts a fitting method based on the arrhenius equation, and uses a variety of materials to perform fitting data verification to verify the ideal data. Experts said that the Languang laboratory uses a 125μm polycarbonate film to conduct oxygen permeability tests at temperatures between 10 ° C and 45 ° C. The equipment used is the Labthink VaC-V1 gas permeation meter. The test temperatures are 10, 23, 30, 35, 40, 45, respectively. The number of effective tests performed at each temperature point is not less than 3, and the relative standard deviation of the test data is within 3.5%. The data of the oxygen permeability of the polycarbonate film obtained at any temperature of -120 to 350 ° C (ie, 153 K to 623 K) was obtained by using the data fitting function of VaC-V1. This temperature range is selected according to the embrittlement temperature of common plastics, as well as the thermodynamic conversion temperature, combined with the actual use temperature of the general film material, is a relatively comprehensive temperature range. Of course, if the test gas source used is nitrogen or other inorganic gases, the data fitting function of the device can also be used to obtain the gas permeability of other gases.

Experts say that it is important to note that the organic gas is condensed when it penetrates through the film, so there is some restriction when using the fitting function. The test shows that the oxygen permeability of polycarbonate has obvious influence with the increase of temperature. Therefore, according to the membrane technology theory, the solubility coefficient of the sample and the diffusion coefficient of the gas in the material can be detected while detecting the gas permeability and the gas permeability of the sample. Of course, the permeability coefficient of the material is proportional to the amount of gas permeability, so the trend with temperature increase is consistent with the curve in FIG. The oxygen permeability database of polycarbonate film at any temperature in the temperature range of -120 ° C to 350 ° C has been built by Labthink Lab, and the oxygen permeability data at these special temperatures can help users package reasonably and efficiently. Structural design of the material. The Languang Laboratory will conduct the testing of commonly used materials such as polyester, polyethylene, polypropylene, and polyvinyl chloride, and establish a database of oxygen permeability in the temperature range of -120 to 350 °C. The material structure is designed to better meet the packaging requirements at special temperatures.

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