I AM HASAN AHMED

AND MY ID IS

2012000400111

My assignment contains

1) Definition

2) What is Acrylic fibre

3) Chemical composition of acrylic fibre

4) Acrylic Fiber Features

5) Properties of Acrylic Fibers

6) Acrylic Fiber Characteristics

7) Advantages of Acrylic Fibers

8) Uses of Acrylic Fiber

9) Commercial market review

Acrylic is a synthetic man-made fiber which was

created to mimic wool and it does bear some

resemblance to it in softness.Some brand names for

acrylic are Acrilan, Orlan, and Creslon. The fiber

has a soft, smooth feel which is very similar to

wool, and is lightweight. It is often used to create

plush velvets, and dyes beautifully.

Acrylic can be thought of as artificial wool. It is made from theunlikely combination of coal, air, water, oil and limestone. DuPontfirst made acrylic fibers in 1944 and began commercialproduction in 1950. It is spun by either dry spinning or wetspinning. In dry spinning the dissolved polymers are extrudedinto warm air. The fibers solidify by evaporation. In wet spinningthe polymer is dissolved and extruded into a bath and then dried.In some ways, acrylic imitates wool. It has wool's warmth andsoftness, but does not absorb water. Instead, acrylic wicksmoisture to the surface where it evaporates. Acrylic is used inknitted apparels such as fleece, socks, sportswear and sweaters. Itis also used to create fake fur, craft yarns, upholstery fabric,carpet, luggage, awnings, and vehicle covers. The acrylic fibersinclude acrylic, modacrylic, and other vinyl fibers containingcyanide groups as side chains. Among the major acrylic fibersused in commerce, acrylonitrile is the comonomer containing acyanide group.

1. Specific Gravity ————— 1.14 – 1.19

2. Melt Point ———————- No definite melt.

3. Moisture Regain (%) ——— 1.0 – 2.5

4. Breaking Tenacity (gpd) — 2.2 – 5.4

5. Elongation at Break ——— 0.00 – 0.00

Resilient and retains shape

Quick drying

Resistant to water damage, sunlight and does not fade

Resistant to mold, mildew and insects

Flammable

1. Acrylic has a warm and dry hand like wool. Its density is 1.17g/cc as compared to 1.32 g/cc of wool. It is about 30% bulkierthan wool. It has about 20% greater insulating power than wool.

2. Acrylic has a moisture regain of 1.5-2% at 65% RH and 70 deg F.

3. It has a tenacity of 5 gpd in dry state and 4-8 gpd in wet state.

4. Breaking elongation is 15% ( both states)

5. It has a elastic recovery of 85% after 4% extension when the loadis released immediately.

6. It has a good thermal stability. When exposed to temperaturesabove 175 deg C for prolonged periods some discolouration takesplace.

7. Acrylic shrinks by about 1.5% when treated with boiling waterfor 30 min.

8. It has a good resistance to mineral acids. The resistance to weakalkalies is fairly good, while hot strong alkalies rapidly attackacrylic.

9. Moths, Mildew and insects do not attack Acrylic.

10. It has an outstanding stability towards

Outstanding wickability & quick drying to move moisture

from body surface

Flexible aesthetics for wool-like, cotton-like, or blended

appearance

Easily washed, retains shape

Resistant to moths, oil, and chemicals

Dyeable to bright shades with excellent fastness

Superior resistance to sunlight degradation

Due to its wicking ability and other characteristics, the fabric designers

all over world are opting acrylic fabrics for manufacturing garments for

all seasons.

Not only, the acrylic fabrics are high in performance but also they have

a luxurious feel and they also drape very well.

They are lightweight but have more bulk. This is due to their quality of

lower specific gravity.

They are comfortable to wear due to high moisture management.

Dyes can be easily applied to them and they are colorfast.

They are odor and mildew resistant too.

In cold weather acrylics provide excellent insulation and warmth

without any extra weight.

1. Knit Jersey, Sweater, blankets

2. Wrinkle resistant fabrics.

3. Pile and Fleece fabrics

4. Carpets and rugs

As shown in the figure below, major apparel and home

furnishings applications for acrylic fiber account for 63 percent

and 30 percent, respectively, of the global acrylic fibers

market. These applications reflect its properties primarily as

synthetic wool and, to a lesser extent, synthetic cotton. Thus, in

garments it is found in sweaters, socks, fleece wear, circular knit

apparel, sportswear and children’s wear. In home furnishings, it

is used in blankets, area rugs, upholstery, awnings, and outdoor

furniture.

Partially carbonized and pre-oxidized acrylic fiber tow is used

as an asbestos replacement in applications such as clutch and

brake pads. Fully carbonized sub-tow (acrylic fiber precursor )

is used to produce high tenacity carbon fiber.

An acrylic fiber precursor for high performance carbon

fibers free of defects which comprises an acrylonitrile

polymer containing at least 90% by weight of acrylonitrile

and has a surface roughness of 2.0 to 3.0 with dense inner

structure. from a solution comprising 24 to 27.5% of the

acrylonitrile polymer is dry-jet wet spun into a coagulation

bath consisting essentially of dimethylformamide or

dimethylacetamide and having a bath temperature of 5

obtained by carbonizing these precursor acrylic fibers

have no fusion bonding or agglutination of filaments and

exhibit high performance.