Polyethylene Terephthalate suppliers

Polyethylene Terephthalate

CAS:: 25038-59-9

MF:: C10H12O6

MW:: 228.19868

Use：: The first stage to produce Polyethylene Terephthalate (PET) is the reaction of ethylene glycol with terephthalic acid or dimethyl terephthalate. After the initial reaction, two or three polymerization steps are then performed, depending on the required molecular weight. The chemical structure of PET is composed of repeated units. Each unit has a physical length of about 1.09 nm and a molecular weight of ~200. PET monomer consists from an aromatic ring coupled with a short aliphatic chain that makes PET a stiff molecule as compared to other aliphatic polymers such as polyolefin or polyamide. The lack of segmental mobility in the polymer chains results in relatively high thermal stability. A textile grade polymer will have an average number of 100 repeat units per molecule so that the extended length of the typical polymer chain is about 100 nm with a molecular weight of ~20,000. Higher levels of polymerization produce higher strength fibers but the melt viscosity and stability of the melt to even tiny amounts of moisture causes hydrolytic degradation.Photo-degradation of PET occurs after exposure to near-ultraviolet light resulting in either chain scission by Norrish I and II reactions. Cross-linking also takes place and polymer becomes brittle, discolored, and with uneven surface. PET when exposed to UV light degrades rather rapidly leading to deterioration in physical and mechanical properties and develops intense yellow color. It has been suggested that the photo-oxidation of PET involves the formation of hydroperoxide species through oxidation of the CH2 groups adjacent to the ester linkages and the hydroperoxide species involving the formation of photoproducts through several pathways. The ester moieties in the terephthalate moiety as well as CH2 groups are strongly involved in the photo-degradation of PET. The vinyl ester ends also act as cross-linkers and gelling agents. They polymerize and the polymers thermally degrade to give yellow or brown polyenes that discolor the final polymer. The formation of highly conjugated species is catalyzed by carboxyl groups. The formation of colored species is followed by increase of more carboxyl terminated species. Hence, the product having higher carboxyl value is subject to more discoloration. Furthermore, as the carboxyl content increases, the thermo-oxidative stability decreases. The carboxyl end groups act as catalysts for further degradation.

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You can find Polyethylene Terephthalate suppliers, manufacturers, and distributors from countries such as China, United States and the Switzerland here. Browse to the tetrahydrofuran product information displayed by the supplier, as well as the supplier's contact and capability information.

PT CHEM GROUP LIMITED

Polyester granular
Remarks: Purity: 0.95&0.99 | Package: 0.1KG;1KG;1000KG | CustNote: Factory Supply
TEL: 0371-
CHINA Trader

Hebei Yanxi Chemical Co., Ltd.

poly(ethylene terephthalate) macromolecule
Remarks: Purity: 0.99|Package: 1kg;50.00;USD
CHINA Manufacturer

￥50.00/1kg

Henan Tianfu Chemical Co.,Ltd.

poly(ethylene terephthalate) macromolecule
Remarks: Purity: 99% | Package: 25KG;5KG;1KG
TEL: 0371-55170693
CHINA Trader

career henan chemical co

POLY(ETHYLENE TEREPHTHALATE)
Remarks: Purity: 99% | Package: 1KG;1USD
TEL: 0371-86658258
CHINA Reagent

￥1.00/1KG

Chongqing Chemdad Co., Ltd

POLY(ETHYLENE TEREPHTHALATE)
Remarks: Purity: 0.98 | Package: 1kg，2kg，5kg，10kg，25kg
TEL: 023-+86-023-61398051
CHINA Trader

Zhengzhou Alfa Chemical Co.,Ltd

Polyethylene Terephthalate
Remarks: Purity: 95% Min. | Package: 5g, 10g, 100g; 500g; 1kg; 25kg
TEL: 0371-
CHINA Trader

Hefei TNJ Chemical Industry Co.,Ltd.

poly(ethylene terephthalate)
TEL: 0551-0551-65418671
CHINA Reagent

Dorne Chemical Technology co. LTD

POLY(ETHYLENE TEREPHTHALATE)
Remarks: Purity: 0.99
TEL: 86-13583358881
CHINA Trader

Dideu Industries Group Limited

Polyethylene Terephthalate
Remarks: Purity: 99.00% | Package: 25kgs/Drum;200kgs/Drum | CustNote: ISO 9001：2015 REACH Approved Manufacturer
TEL: 029-+86-29-89586680
CHINA Trader

￥1.10/1g

Alfa Chemistry

POLY(ETHYLENE TEREPHTHALATE)
Remarks: CustNote: https://surfactant.alfa-chemistry.com/product/polyethylene-terephthalate-cas-25038-59-9-339261.html
TEL: +1-5166625404
UNITED STATES Reagent