Method for promoting conversion of crystal form II in isotactic poly-1-butene composite into crystal form I by using high-energy electron irradiation

A high-energy electronic and composite material technology, applied in the field of crystal form II-I transformation, can solve the problems of complex process, limited application, harsh copolymerization conditions, etc., and achieve the effects of no solvent, easy reaction control, and high conversion rate.

Active Publication Date: 2018-07-06
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 temperatu

Method used

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  • Method for promoting conversion of crystal form II in isotactic poly-1-butene composite into crystal form I by using high-energy electron irradiation
  • Method for promoting conversion of crystal form II in isotactic poly-1-butene composite into crystal form I by using high-energy electron irradiation
  • Method for promoting conversion of crystal form II in isotactic poly-1-butene composite into crystal form I by using high-energy electron irradiation

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Embodiment Construction

[0017] The technical solutions of the present invention will be further described below in conjunction with specific embodiments. Isotactic poly-1-butene (iP-1-B), BASELL (BASELL Polyolefins GmbH, Frankfurt, Germany) homopolymer, the grade is PB 0110M, M w =711000g / mol, T m =117°C, T g =-20°C, ρ=0.914g·cm -3 , the melt flow rate is 0.4g / 10min (190°C / 2.16kg). Low-density polyethylene (LDPE), Sinopec Beijing Yanshan Petrochemical Branch, brand name is 112A-1, MFR=2.0g / min, density is 0.918g / cm 3 .

[0018] Weigh 7g of iP-1-B 0110M, preheat it with a flat vulcanizer at 180°C for 10 minutes, then gradually increase the pressure to 25MPa by gradually increasing the pressure, keep it at the highest pressure for 3 minutes, and then cold press it at 25MPa for 8 minutes. Press a 0.5mm-thick sheet sample, take it out, and place it at room temperature 20-25 degrees Celsius for 30 days (24×30 hours), so that the II crystal is basically transformed into I crystal. Cut the samples int...

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Abstract

The invention discloses a method for promoting conversion of a crystal form II in an isotactic poly-1-butene composite into a crystal form I by using high-energy electron irradiation. According to theinvention, high-energy electron irradiation is carried out on a blended composite of isotactic poly-1-butene and low-density polyethylene to promote the conversion of the crystal form II in the iP-1-B blended composite into the crystal form I. The method is applicable to blended materials based on homopolymerized iP-1-B; process flow is simple; copolymerization or application of a force field isnot needed; conversion time can be greatly shortened; and a high conversion rate can be achieved within a short period of 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 crystal form II-I in isotactic poly-1-butene composite materials by using high-energy electron irradiation. 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 a...

Claims

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Application Information

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IPC IPC(8): C08L23/20C08L23/06C08J3/28
CPCC08J3/28C08J2323/20C08J2423/06C08L23/20C08L2205/02C08L2207/066C08L23/06
Inventor 李景庆蔡晓倩蒋世春尚英瑞
Owner TIANJIN UNIV
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