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Method for controlling spherulitic radial relative growth rate of iP-1-B by blending iP-1-B with LDPE

A technology of isotactic polybutene and growth rate, which is applied in the field of relative radial growth rate of tactic polybutene spherulites, can solve problems such as limitation and size shrinkage, and achieve the effect of simple operation and simple process

Active Publication Date: 2018-07-10
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

[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 and low hardness etc., but its application is limited due to the size shrinkage caused by crystal transformation during processing

Method used

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  • Method for controlling spherulitic radial relative growth rate of iP-1-B by blending iP-1-B with LDPE
  • Method for controlling spherulitic radial relative growth rate of iP-1-B by blending iP-1-B with LDPE
  • Method for controlling spherulitic radial relative growth rate of iP-1-B by blending iP-1-B with LDPE

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Embodiment Construction

[0015] The present invention will be further described in detail below in combination with specific embodiments.

[0016] Weigh 50g 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 , with a melt flow rate of 0.4g / 10min (190°C / 2.16kg)) and 5.5556g of LDPE 112A-1 (Beijing Yanshan Petrochemical, grade 112A-1, MFR = 2.0g / min, density 0.918g / cm 3 ), after mixing uniformly in advance, in the XSS-30 type torque rheometer, at 180 ℃, blending 12min, rotating speed is 30rpm, obtains the iP-1-B / LDPE blend of 10wt% LDPE content, denoted as iP-1-B / LDPE (90 / 10, that is, the ratio of the added mass of LDPE to the sum of the mass of iP-1-B+LDPE), the obtained sample was cooled to room temperature for later use. 7g iP-1-B and 7giP-1-B / LDPE (90 / 10) were preheated at 180°C for 10 minutes with a laboratory-made flat vulcanizer, and then the pressure was gradually increased to 25MPa by gradually increasing the pr...

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Abstract

The invention discloses a method for controlling the spherulitic radial relative growth rate of iP-1-B by blending iP-1-B with LDPE. The method includes the steps that iP-1-B is subjected to melt blending with different contents of LDPE, blending samples are heated to 180 DEG C, subjected to heat preservation for 5-10 min and then cooled to different temperatures for isothermal crystallization, and a polarizing microscope is used for recording the spherulitic radial growth process during isothermal crystallization to obtain the spherulitic radial relative growth rate of the crystal form II inisothermal crystallization at different temperatures. It is found that by regulating the isothermal crystallization temperature, the spherulitic radial relative growth rate of the crystal form II in iP-1-B / LDPE can be controlled.

Description

technical field [0001] The invention belongs to the technical field of polymer processing, and more specifically relates to a method for regulating the relative radial growth rate of isotactic poly-1-butene spherulites. 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 me...

Claims

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Application Information

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IPC IPC(8): C08L23/20C08L23/06C08J3/00
CPCC08J3/00C08J2323/20C08J2423/06C08L23/20C08L2207/066C08L23/06
Inventor 李景庆蔡晓倩蒋世春尚英瑞
Owner TIANJIN UNIV
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