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Interlaminar toughening of thermoplastics

A thermoplastic, thermoplastic matrix technology, applied in the direction of layered products, thin material processing, metal layered products, etc., can solve problems such as expanding damage area

Active Publication Date: 2014-04-30
CYTEC TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This configuration allows for easier transfer of impact events to the next ply, which increases the damage area

Method used

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  • Interlaminar toughening of thermoplastics
  • Interlaminar toughening of thermoplastics
  • Interlaminar toughening of thermoplastics

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0065] Example 1 - Toughening with glass

[0066] Test laminates were made by weaving BGF104I617 finished glass fabric (glass reinforced to .55oz / yd 2 ) of the two layers are placed containing Cypek TM - Formed between unidirectional tape plies of DSE resin and Hexcel AS4 carbon fiber, an unsized carbon fiber typically used for 12K fibers (12,000 filaments) of 7 μm nominal diameter. No additional resin film is used. A control laminate was also formed which was identical to the test laminate described above but was not toughened with glass fabric. CAI performance was measured using ASTM D7136. Table 1 and Table 2 show the test results based on 4 test samples.

[0067] Table 1 – Controls

[0068]

[0069] Table 2 - Toughening with glass

[0070]

[0071] The glass fabric was found to improve CAI performance when compared to the control laminate. The glass interlaminar toughening material increased the CAI to 57 KSI (normalized to correct for ply thickness), a 2 ks...

example 2

[0074] Example 2 - Toughening with thermoplastic film

[0075] The same method was used to form a test laminate as described in Example 1 above, but using 0.25 mil Cypek TM - DSE membrane instead of glass fabric as middle leaf for toughening. CAI performance was measured using ASTM D7136. Table 3 shows the test results based on 4 test samples.

[0076] Table 3 – Using Cypek TM DSE toughened

[0077]

[0078] DISCOVERCypek TM The DSE film improves post-impact compression properties. 55.1 ksi (unnormalized) was achieved relative to 53.6 ksi (unnormalized) for the control.

[0079] Figure 5 is a photomicrograph showing the interlaminar region of a laminate formed according to this example.

example 3

[0080] Example 3 - Toughening with glass and thermoplastic film

[0081] Test laminates were laminated by Cypek TM DSE resin-impregnated UD tapes of AS4 carbon fiber with 2 glass fiber cloths (0.72oz / yd) inserted between adjacent UD tapes 2 ) ply and two 0.24 mil Cypek TM DSE membrane layer to manufacture. These test laminates were processed alongside the control laminates using standard cure process conditions of 710°F / 100 psi. CAI strength was measured using ASTM D7136. Table 4 and Table 5 show the test results based on 4 test samples.

[0082] Table 4 – Controls

[0083]

[0084] Table 5 – with glass / Cypek TM PEKK toughened

[0085]

[0086]

[0087] For Cypek-based TM For the DSE matrix carbon fiber reinforced control laminate, the CAI strength was 49.8 ksi after the 1500 in-lb / in impact energy test. For use with glass fabric and Cypek TM An average CAI strength of 55.0 ksi was obtained for the DSE film toughened laminate.

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Abstract

Some embodiments herein are directed to a thermoplastic composite structure having at least one structural layer of fiber-reinforced thermoplastic resin and at least one toughening layer adjacent to a surface of the structural layer. The toughening layer is configured to create an interlaminar region in a composite laminate and may take the form of a polymer film, a woven or non-woven fibrous material, free particles, a polymer layer or non-woven veil with toughening particles dispersed therein, metal mesh or foil.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 61 / 528,561, filed August 29, 2011. Background technique [0003] Conventionally, thermoplastic tougheners are added to thermoset resin systems to impart toughness and reduce brittleness that would otherwise exist in composites without the use of thermoplastic tougheners. For example, thermoplastic toughening particles or thermoplastic tougheners are used with structural composites to improve the toughness of thermoset resin based systems. In contrast to thermoset resin systems, thermoplastic resin systems are generally not reinforced with other toughening materials because thermoplastic systems are generally considered to be sufficiently tough. However, the evolution of composite materials has been influenced by the aerospace industry and other industries that require improved properties (eg, improved toughness) of thermoplastic materials. [0004] One...

Claims

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Application Information

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IPC IPC(8): B32B27/12B29C70/08B32B7/02
CPCB32B2260/046B32B27/12B32B5/26B32B27/18B32B2260/023B32B15/14B32B2307/558B32B5/12B32B27/286B32B27/288B32B2262/0269B32B2262/101B32B2262/106Y10T428/256Y10T442/10Y10T442/198Y10T428/31504Y10T442/3854Y10T442/674Y10T428/249942Y10T428/31678Y10T428/31721
Inventor 斯科特·阿尔弗雷德·罗杰斯詹姆斯·弗朗西斯·普拉特
Owner CYTEC TECH CORP
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