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Method for promoting crystal form II-I transformation of isotactic poly-1-butylene through high energy electronic irradiation

A high-energy electron, II-I technology, applied in the field of regular poly-1-butene crystal form II-I transformation, can solve the problems of harsh copolymerization conditions, reduced isotacticity, and complicated process, and achieves easy control of the reaction and high conversion. The effect of efficiency and simple process

Inactive Publication Date: 2018-07-03
TIANJIN UNIV
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Problems solved by technology

However, the copolymerization can inhibit the crystallization process of iP-1-B and reduce the isotacticity, but the copolymerization conditions are harsh, the reaction is greatly affected by temperature, pressure, solvent, etc., the process is complicated, and the application is limited

Method used

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  • Method for promoting crystal form II-I transformation of isotactic poly-1-butylene through high energy electronic irradiation
  • Method for promoting crystal form II-I transformation of isotactic poly-1-butylene through high energy electronic irradiation
  • Method for promoting crystal form II-I transformation of isotactic poly-1-butylene through high energy electronic irradiation

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Embodiment Construction

[0013] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0014] Weigh 7g of iP-1-B 0110M (Basell company, homopoly iP-1-B, trade mark is PB 0110M, M w =711000g / mol, T m =117°C, T g =-20°C, ρ=0.914g·cm -3 , melt flow rate is 0.4g / 10min, 190°C / 2.16kg), preheated with a flat vulcanizing machine at 180°C for 10min, and then gradually increased the pressure to 25MPa by gradually increasing the pressure, keeping the temperature at the highest pressure for 3min, and then Cold press at 25MPa for 8 minutes to form a 0.5mm-thick sheet sample. After taking it out, place it at room temperature at 20-25 degrees Celsius for 30 days (24×30 hours), so that the II crystal is basically transformed into I crystal.

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Abstract

The invention discloses a method for promoting crystal form II-I transformation of isotactic poly-1-butylene through high energy electronic irradiation. The isotactic poly-1-butylene of a crystal formI is subjected to high energy electronic irradiation, and crystal form II-I transformation in homo-polymerized iP-1-B can be promoted by adopting the high energy electronic irradiation. The method disclosed by the invention is applicable to the homo-polymerized iP-1-B, a simple process is adopted, copolymerization or applied force field is not needed, the transformation time can be greatly shortened, a high conversion ratio is reached in a short time, and copolymerization is not needed.

Description

technical field [0001] The invention belongs to the technical field of polymer processing, and more specifically relates to a method for promoting the transformation of isotactic poly-1-butene crystal form II-I. Background technique [0002] Isotactic poly-1-butene (iP-1-B) is a thermoplastic polyolefin with outstanding creep resistance, impact resistance, chemical resistance, environmental stress cracking resistance and high elastic recovery ratio with low hardness etc., but its application is limited due to the size shrinkage caused by crystal transformation during processing. iP-1-B has a complex polymorphic structure. It crystallizes under different conditions to form five different crystal forms I, II, III, I', II', and melt crystallizes to form tetragonal crystal form II. Its molecules The chain uses pairs of 11 3 The helical conformation is stacked, retaining a large amount of intramolecular mobility above the glass transition temperature of 249K, and the melting en...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/28C08L23/20
CPCC08J3/28C08J2323/20
Inventor 李景庆蔡晓倩蒋世春尚英瑞
Owner TIANJIN UNIV
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