- ikeLv 51 decade agoFavorite Answer
1.Poly(ethylene terephthalate), or PET, is a thermoplastic polyester resin.
Such resins may be classified as low-viscosity or high-viscosity resins.
Low-viscosity PET typically has an intrinsic viscosity of less than 0.75,
while high-viscosity PET typically has an intrinsic viscosity of 0.9 or higher.
Low-viscosity resins, which are sometimes referred to as "staple" PET (when used in textileapplications), are used in a wide variety of products, such as apparel fiber, bottles, and photographic film.
High-viscosity resins, sometimes referred to as "industrial" or "heavy denier" PET, are used in tire cord, seat belts, and the like.
Two grades of PET were used in this study. One is a bottle-grade (Eastman 9921W), with an intrinsic viscosity, I.V., equal to 0.81 dl /g, a weight-average molecular weight, [M.sub.w], equal to 56,250 Da and a number-average molecular weight, [M.sub.n], equal to 26,000 Da. It will be referred to as "HPET" in the following. The other is an amorphous fiber grade, with an I.V. equal to 0.651 dl/g, and [M.sub.w] and [M.sub.n] respectively equal to 42,300 Da and 18,100 Da. It will be referred to as "LPET" in the following.
0.40 – 0.70 dℓ/g Textile
0.72 – 0.98 dℓ/g Technical, tire cord
0.60 – 0.70 dℓ/g PET film (biaxially oriented)
0.70 – 1.00 dℓ/g Sheet grade for thermoforming
0.70 – 0.78 dℓ/g Water bottles (flat)
0.78 – 0.85 dℓ/g Carbonated soft drink grade
Monofilament1.00 – 2.00 dℓ/g
- 下雪Lv 71 decade ago