Method for measuring polymer weight-average molecular weight

A weight-average molecular weight and polymer technology, which is applied in the direction of measuring devices, testing material strength by using one-time impact force, and analyzing materials, can solve the problems of polymer molecular weight difficulties, and overcome the inability or difficulty to measure insoluble or insoluble substances. Effect of Weight Average Molecular Weight Limitation

Pending Publication Date: 2019-03-08
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obtaining the molecular weight of the polymer is difficult due to the lack of readily available instruments, equipment or suitable solvents
Rheological methods can indirectly estimate the molecular weight parameters of polymer materials. For example, patents with application numbers 200910095287.X and 201310147593.X both provide methods for measuring the molecular weight of linear polymers using rheological methods, but rheometers are required.

Method used

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  • Method for measuring polymer weight-average molecular weight
  • Method for measuring polymer weight-average molecular weight
  • Method for measuring polymer weight-average molecular weight

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The first step is to measure the notched impact strength z of the polymer sample on the impact testing machine; (standard is GB / T 1843-2008)

[0031] In the second step, the melt flow rate x of the polymer sample is measured on a melt flow rate meter; (the standard is GB / T3682-2000).

[0032] According to the above steps, the weight average molecular weight M (M A ,M B ,M C ,M D ) and melt flow rate x(x A , x B , x C , x D ) (190°C, 2.16kg) data, make the fitting curve of the weight average molecular weight M changing with the melt flow rate x, the relationship curve is as follows figure 1 shown;

[0033] from figure 1 It can be seen that the relationship between the two can be used M=10 5 ×D0×x D Formula (II) expresses,

[0034] where D=-0.24, D0=1.477.

[0035] Thus it can be known that the weight average molecular weight M of the high-density polyethylene sample A A vs. melt flow rate x A (190°C, 2.16kg);

[0036] Take two polymer materials such as HD...

Embodiment 2

[0046] The first step is to measure the notched impact strength z of the polymer sample on the impact testing machine; (the measurement standard is GB / T1843-2008)

[0047] The second step is to measure the melt flow rate x of the polymer sample on a melt flow rate meter; (measurement standard is GB / T3682-2000).

[0048] According to the above steps, the weight average molecular weight M (M A ,M B ,M C ,M D ) and melt flow rate x(x A , x B , x C , x D ) (190°C, 2.16kg) data, make the fitting curve of the weight average molecular weight M changing with the melt flow rate x, the relationship curve is as follows figure 1 shown;

[0049] from figure 1 It can be seen that the relationship between the two can be used M=10 5 ×D0×x D (II) said,

[0050] where D=-0.24, D0=1.477.

[0051] Thereby it can be known that the weight-average molecular weight M of the high-density polyethylene sample B B vs. melt flow rate x B (190°C, 2.16kg);

[0052] Take two polymer materials...

Embodiment 3

[0062] The first step is to measure the notched impact strength z of the polymer sample on the impact testing machine; (the measurement standard is GB / T1843-2008)

[0063] The second step is to measure the melt flow rate x of the polymer sample on the melt flow rate meter; (measurement standard is GB / T3682-2000);

[0064] According to the above steps, the weight average molecular weight M (M A ,M B ,M C ,M D ) and melt flow rate x(x A , x B , x C , x D ) (190°C, 2.16kg) data, make the fitting curve of the weight average molecular weight M changing with the melt flow rate x, the relationship curve is as follows figure 1 shown;

[0065] from figure 1 It can be seen that the relationship between the two can be used M=10 5 ×D0×x D (II) said,

[0066] where D=-0.24, D0=1.477.

[0067] from figure 1 The weight-average molecular weight M of the high-density polyethylene sample C C vs. melt flow rate x C (190℃, 2.16kg)

[0068] Relationship;

[0069] Choose HDPE C an...

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Abstract

The invention relates to a method for measuring polymer weight-average molecular weight. The method includes, firstly, measuring the impact strength z of a notch of the polymer on an impact tester; measuring the melt flow rate x of the polymer on a melt flow rate meter, wherein the relationship between the impact strength Z of the notch of the polymer and the melt flow rate x is a power function:z = C0* xC (I), the C and C0 are constants, the relationship between the weight-average molecular weight M of the polymer and the melt flow rate x is a power function: M = 105* D0* xD (II), the D andD0 are constants, and after the formulas (I) and (II) are simplified, M = 105* D0* (z/C0)D/C can be obtained; bringing in the impact strength z of the notch to obtain the polymer weight-average molecular weight M by solving. The invention can measure and obtain the Weight-average Molecular Weight of the polymer only through a common melt flow rate meter and an impact strength machine, and the method is fast, environment-friendly and accurate.

Description

technical field [0001] The invention relates to a method for measuring the weight-average molecular weight of a polymer (macromolecular material), in particular to testing the impact strength and melt flow rate of the polymer with a mechanical method, and solving the weight-average molecular weight with a nonlinear fitting method. Background technique [0002] At present, the method for measuring the molecular weight of polymer materials is mainly GPC method, including high temperature GPC method. Obtaining the molecular weight of a polymer is difficult due to the lack of readily available instruments, equipment or suitable solvents. Rheological methods can indirectly estimate the molecular weight parameters of polymer materials. For example, patents with application numbers 200910095287.X and 201310147593.X both provide methods for measuring the molecular weight of linear polymers using rheological methods, but rheometers are required . However, this application does not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/30G01N11/00
CPCG01N3/30G01N11/00
Inventor 廖华勇龚心玥王玥晖常承碧陶国良刘春林
Owner CHANGZHOU UNIV
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