Silicones for Hair Strengthening

Mar 1, 2007 | Contact Author | By: Bethany K. Johnson, Kim M. Quackenbush and Brian J. Swanton, Dow Corning Corp.
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Title: Silicones for Hair Strengthening
hair damagex hair strengtheningx siliconex single fiberx tensile testingx
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Keywords: hair damage | hair strengthening | silicone | single fiber | tensile testing

Abstract: Single-fiber tensile testing demonstrates the hair-strengthening properties of several silicone materials in leave-in and rinse-off applications.

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Consumers have become increasingly aware of hair damage caused by chemical processes, heat styling and environmental factors. In addition to healthy, shiny, smooth and silky hair, both men and women look for protection against split ends and breakage, along with greater strength and resilience.

Many women believe they have damaged hair, and products that make hair-strengthening claims have caught the attention of these consumers. Silicones hold promise for providing hair-strengthening benefits, especially in products designed for damaged or ethnic hair.

A New Role for Silicones 
A variety of silicone materials are recognized for their sensory and functional benefits in hair care products. Initially incorporated into formulations for their conditioning properties, silicones also provide shine, aid color retention and protect against heat damage from curling irons and blow dryers.

In the study described in this article, a method was developed to determine whether silicones could also provide strengthening properties to hair, helping to counteract potentially damaging treatments. In combination with the other multifunctional properties of silicones, hair strengthening would offer additional consumer benefits from individual products.

The hair care industry has responded to these market needs, and a number of commercially available products incorporate organic ingredients traditionally used to strengthen or repair hair. These typically include various wheat, soy or hydrolyzed vegetable proteins. Another conventional ingredient, panthenol, is claimed to provide hair strengthening as well as some degree of conditioning.

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Table 1. Work of elongation

 Table 1. Work of elongation 

Figure 1. Mounting arrangement

Figure 1. Mounting arrangement  

Figure 2. Load force vs. displacement

Figure 2. Load force vs. displacement 

Figure 3. a) Untreated hair fiber and b) hair fiber treated with leave-on silicone

Figure 3. a) Untreated hair fiber and b) hair fiber treated with leave-on silicone 

Figure 4. a) Hair fibers treated

Figure 4. a) Hair fibers treated  

Repairing Damaged Hair

Johnson: Silicones for Hair Strengthening Footnotes

 a The Mitutoyo Laser Scan Micrometer (LSM-500) is a product of Mitutoyo Corp., Kanagawa, Japan.

b Hair samples were obtained from DeMeo Brothers Inc., New York, N.Y., USA. 
c The Branson 200 Ultrasonic Cleaner is a product of Branson Ultrasonics Corp., Danbury, Conn., USA.
d The Instron 4464 universal testing machine is manufactured by Instron Corp., Norwood, Mass., USA.
e Minitab 14 Statistical Software is a product of Minitab Inc., State College, Penn., USA.
f Dow Corning 5-7070 Si Amino Elastomer Emulsion is a product of Dow Corning Corp., Midland, Mich., USA. Dow Corning is a registered trade name of Dow Corning Corp.
g Dow Corning 5-7113 Silicone Quat Microemulsion is a product of Dow Corning Corp., Midland, Mich., USA.
h Dow Corning 2-2078 Fluid is a product of Dow Corning Corp., Midland, Mich., USA.

Formula 1. Prototype leave-on conditioner

Formula 1. Prototype leave-on conditioner 

Formula 2. Prototype leave-on conditioner

Formula 2. Prototype leave-on conditioner  

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