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Low-temperature stretching rheometer and method for testing low-temperature performance of high molecular film

A polymer film, low-temperature performance technology, applied in the direction of flow characteristics, the use of stable tension / pressure test material strength, instruments, etc., can solve the problems that have not been reported before, near tens of degrees below zero, to achieve accurate Temperature control, adjustable cooling rate, and large torque range

Pending Publication Date: 2018-06-12
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although there have been a lot of accumulations about flow field-induced crystallization, most of them are used to study semi-crystalline polymers, such as polyethylene and polypropylene, and for some common synthetic rubbers, the crystallization temperature is often around tens of degrees below zero. The in situ study of rubber crystallization induced by low temperature stretching has not been reported so far

Method used

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  • Low-temperature stretching rheometer and method for testing low-temperature performance of high molecular film
  • Low-temperature stretching rheometer and method for testing low-temperature performance of high molecular film
  • Low-temperature stretching rheometer and method for testing low-temperature performance of high molecular film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] A low temperature extensional rheometer comprising:

[0089] The sample cavity is a double-roller fixture arranged in the sample cavity, and the double-roller fixture includes a first roller fixture and a second roller fixture, and both the first roller fixture and the second roller fixture have undergone sandblasting treatment;

[0090] A cooling chamber arranged outside the sample chamber, the cooling chamber communicates with a cold source; the cold source is a self-pressurized liquid nitrogen tank, and the self-pressurized liquid nitrogen tank communicates with the cooling medium inlet of the cooling chamber through a liquid nitrogen solenoid valve ;

[0091] A vacuum chamber arranged outside the cooling chamber, the vacuum chamber is connected with a miniature vacuum pump;

[0092] A first high-precision servo motor that is connected to the first roller clamp and drives the rotation of the first roller clamp;

[0093] A second high-precision servo motor that is c...

Embodiment 2

[0105] 2.1 Experimental example:

[0106] Synchrotron radiation X-ray in situ study of strain-induced crystallization of polymethylvinylsiloxane at ultralow temperatures.

[0107] 2.2 Purpose of the experiment:

[0108] Silicone rubber is a typical low-temperature elastomer, and the glass transition temperature of commonly used varieties is often below -100°C. Its performance at low temperatures is currently only at the stage of simple low-temperature mechanical properties research; X-rays are an important means of crystallographic research. One is an indispensable characterization method in the field of polymer material research. With the discovery and application of synchrotron radiation X-rays, the detection time resolution has been shortened from tens of hours in the past to the order of milliseconds; whether stretching at low temperature can induce its crystallization It has guiding significance for its low temperature performance.

[0109] 2.3 Experimental process:

...

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Abstract

The invention provides a low-temperature stretching rheometer. The low-temperature stretching rheometer comprises a sample cavity, a double-roller clamp, a cooling cavity, a vacuum cavity, a first motor, a second motor, a torque sensor, a mechanical control system, a temperature measuring instrument, a first motor drive device, a second motor drive device and a motor control system, wherein the double-roller clamp is arranged in the sample cavity; the cooling cavity is arranged outside the sample cavity; the vacuum cavity is arranged outside the cooling cavity; the first motor is connected with a first roller clamp and drives the first roller clamp to rotate; the second motor is connected with the second roller clamp and drives the second roller clamp to rotate; the torque sensor is arranged between the first roller clamp and the first motor; the first motor drive device is connected with the first motor, and the second motor drive device is connected with the second motor; and the motor control system controls the first motor drive device and the second motor drive device by virtue of a motion controller. The invention also provides a method for testing the low-temperature performance of a high molecular film. The low-temperature stretching rheometer provided by the invention can be combined with the scattering of X rays to on-site research a relation between a structure evolution behavior and low-temperature application performance in the stretching process of the high molecular film.

Description

technical field [0001] The invention belongs to the technical field of polymer film performance testing, in particular to a low-temperature extensional rheometer and a method for testing the low-temperature performance of polymer films. Background technique [0002] The glass transition temperature is one of the important parameters of polymer materials. Some typical polymer materials such as rubber often have a very low glass transition temperature. In theory, the glass transition temperature is the lowest critical temperature for its use. According to research, fresh There are reports of rubber crystallization induced by stretching at low temperatures; on the other hand, due to some harsh uses of polymer materials, such as window sealants for high-altitude aircraft, tires for lunar exploration vehicles, and clothing for Antarctic scientific expedition members, all involve Use performance at low temperature, take aircraft window sealing material as an example, if improperly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00G01N3/18G01N23/20
CPCG01N3/18G01N11/00G01N23/20G01N2203/0228G01N2203/0017
Inventor 李良彬陈品章张前磊林元菲孟令蒲
Owner UNIV OF SCI & TECH OF CHINA
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