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PHBV mono-polymer composite material having high fiber volume content and preparation method thereof

A volume content, composite material technology, applied in the direction of conjugated synthetic polymer artificial filaments, chemical instruments and methods, synthetic resin layered products, etc., can solve the problems of narrow processing window, high viscosity, poor interface compatibility, etc. Achieve the effects of good interface compatibility, large difference in melting point, and wide processing window

Active Publication Date: 2017-05-10
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems with traditional fiber-reinforced composites: first, the reinforcement phase and matrix are not homogeneous, the interfacial compatibility is poor, and they cannot be recycled
Second, the reinforcing phase is inorganic fiber or petroleum-based polymer fiber, and the matrix is ​​petroleum-based polymer, which has problems such as resource shortage and environmental pollution
[0003] At present, the PHBV single polymer composite material and its preparation method have the following problems: (1) the matrix and the reinforcing phase are both PHBV, so that the processing window is narrow; (2) PHBV is a thermoplastic polymer material with high viscosity, and the PHBV matrix is ​​difficult to reinforce The phase PHBV fibers are fully infiltrated, and the reinforcing phase PHBV fibers are difficult to disperse uniformly in the PHBV matrix, so that the volume content of the PHBV fibers is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The skin-core structure PHBV short fiber is used as raw material, and the core layer is PHBV fiber with 3-hydroxyvalerate (HV) content of 0, that is, PHB, and the viscosity-average molecular weight is 3.9×10 5 ; The cortex is PHBV with HV content of 20mol%, and the viscosity-average molecular weight is 4.5×10 5 , the volume ratio of the skin to the core is 30:70, and the skin-core structure PHBV nonwoven fabric (area density 22g / m 2 ), superimpose 100 layers of PHBV nonwoven fabrics together, and heat press them into a single-polymer PHBV composite material under a pressure of 5 MPa and a temperature of 130 ° C on a hot press. The tensile breaking strength of the obtained PHBV single polymer composite material is 50.8MPa, and the breaking elongation is 45.2%.

Embodiment 2

[0024] The skin-core structure PHBV short fiber is used as a raw material, wherein the core layer is a PHBV fiber with a 3-hydroxyvalerate (HV) content of 2.5 mol%, and a viscosity-average molecular weight of 5.6×10 5 ; The cortex is a PHBV with a HV content of 29mol%, and a viscosity-average molecular weight of 2.6×10 5 , the volume ratio of the skin to the core is 20:80, and the skin-core structure PHBV nonwoven fabric (area density 18g / m 2 ), superimposed 50 layers of PHBV nonwoven fabrics, and hot pressed them into a single-polymer PHBV composite material on a hot press at a pressure of 4 MPa and a temperature of 100 °C. The tensile strength at break of the obtained PHBV single polymer composite was 55.7 MPa, and the elongation at break was 30.2%.

Embodiment 3

[0026] The skin-core structure PHBV short fiber is used as raw material, and the core layer is PHBV fiber with 3-hydroxyvalerate (HV) content of 0, that is, PHB, and the viscosity-average molecular weight is 3.9×10 5 ; The cortex is PHBV with HV content of 12mol%, and the viscosity-average molecular weight is 4.8×10 5 , the volume ratio of the skin to the core is 30:70, and the skin-core structure PHBV nonwoven fabric (area density 20g / m 2 ), superimpose 100 layers of PHBV nonwoven fabrics together, and heat press them into a single-polymer PHBV composite material under a pressure of 8MPa and a temperature of 155°C on a hot press. The tensile strength at break of the obtained PHBV single polymer composite was 48.2 MPa, and the elongation at break was 37.5%.

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Abstract

The invention discloses a poly(3-hydroxybutyrate-co-3-hydroxyl pentanoate) (PHBV) mono-polymer composite material having high fiber volume content and a preparation method thereof. A reinforcing phase in the composite material is PHBV fiber with the 3-hydroxybutyrate (HV) content of 0-20 mol%, a substrate is the PHBV with the HV content of 10-100 mol%, and the volume content of the reinforcing phase fiber is 5%-90%. A preparation method of the composite material comprises the steps that 1, the PHBV fiber with a skin-core structure is processed into a fiber aggregate; 2, 1-1000 layers of PHBV fiber aggregates with the skin-core structures are superposed together; 3, the PHBV fiber aggregates with the skin-core structures are hot-pressed into the PHBV mono-polymer composite material on a hot-pressing machine under the pressure of 1-20 MPa and the temperature of 100-160 DEG C. The obtained PHBV mono-polymer composite material can be used in the fields of packaging, automobiles and the like.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) single polymer composite material with high fiber volume content and a preparation method thereof. Background technique [0002] Fiber-reinforced polymer matrix composites have been widely used in aerospace, leisure and entertainment, automobile, construction and sports industries due to their high specific strength, non-corrosion and high fracture toughness. It is making more and more contributions to the low-carbon and environmentally friendly economic development model. Therefore, the market share of fiber-reinforced composite materials is increasing. However, there are two problems with traditional fiber-reinforced composites: first, the reinforcement phase and matrix are inhomogeneous, have poor interfacial compatibility, and cannot be recycled. Second, the reinforcing phase is inorganic fiber or petroleum-based polymer fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B1/08B32B7/12B32B27/12B32B27/36B32B37/10B32B37/12D01F8/14
CPCB32B1/08B32B5/022B32B7/12B32B27/12B32B27/36B32B37/10B32B37/1207B32B2262/0276B32B2307/716D01F8/14
Inventor 刘庆生邓炳耀周钰琦
Owner JIANGNAN UNIV
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