Degradation mechanisms of poly(ethylene terephthalate) tire yarn

Sawada, Shuzo; Kamiyama, Kiyosuke; Ohgushi, Shinichiro; Yabuki, Kazayuki

doi:10.1002/app.1991.070420417

Cited by 20 publications

(5 citation statements)

References 14 publications

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“…The replacement of ester group with carbonyl acid and alcohol groups is clear. This trend supports the mechanism 16,21,23,24 of hydrolytic degradation involving scission of ester linkage in PBT-PTMO copolymer. The correlation between the loss of ester carbonyl groups and intrinsic viscosity is shown in Figure 9, both implying the chain shortening occurring in hydrolysis, regardless of the ageing temperature.…”

Section: Mode Of Hydrolytic Degradationsupporting

confidence: 83%

Hydrolytic degradation of poly(1,4-butylene terephthalate-co-tetramethylene oxalate) copolymer

Shin

Yeh

1999

J. Appl. Polym. Sci.

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Experimentally synthesized poly(1,4-butylene terephthalate-co-tetramethylene oxalate) (PBT-PTMO) monofilaments were evaluated for hydrolytic stability in salt water (SW) and distilled water (DW) at temperature below and above glass transition temperature (T g ), along with commercially available poly(hexamethylene adipamide) (NY), poly(ethylene terephthalate) (PET), and polypropylene (PP) monofilaments. There was no decrease in mechanical properties in case of NY, PET, and PP in either DW or SW below their T g . The breaking strength, ultimate elongation, and thermal shrinkage of the PBT-PTMO, however, decreased as the ageing time increased. Total strength loss occurred after approximately 300 days at 25°C in either DW and SW. This can be attributed to the chain scission that occurs in the PBT-PTMO copolymer chain. The poor hydrolytic stability of the PBT-PTMO may be attributed to the higher moisture regain. The salinity of water did not have a significant effect on the breaking strength loss of the materials. The mode of hydrolytic degradation of aged PBT-PTMO polymer was confirmed by the increasing generation of the acid carbonyl and hydroxyl groups with concomitant increasing consumption of ester groups, regardless of ageing conditions. Above T g , the hydrolytic rate constant (kЈ H , day Ϫ1 ) of the PBT-PTMO, estimated by the rate of formation of acid carbonyl groups, is greater at a higher ageing temperature.

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Section: Mode Of Hydrolytic Degradationsupporting

confidence: 83%

Hydrolytic degradation of poly(1,4-butylene terephthalate-co-tetramethylene oxalate) copolymer

Shin

Yeh

1999

J. Appl. Polym. Sci.

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“…4 Therefore, many efforts have been made to improve these deficiencies. [5][6][7][8][9] On the other hand, nylon cord has the superior fatigue resistance and good adhesion but poor dimensional stability. Yilmaz B.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characteristics of an advanced polyester tire cord with hybrid effect

Tian

Wei

2019

Journal of Engineered Fibers and Fabrics

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Many efforts have been made to study new reinforced materials to meet the increasing demands of various products. Hybrid cords have attracted a great deal of attention due to low cost and incomparable properties. Nylon and polyester are currently two of the most prevalent materials used as tire cords, while how to incorporate both of their desirable properties into one cord has been a meaningful scientific research. In this study, a new advanced polyester tire cord was developed by adopting the design of experiment. Its stress-strain curve demonstrated a high modulus typical for the standard polyester thus improving tire dimensional stability and handling performance and high breaking elongation up to 21.7% that was a favorable characteristic of nylon cord creating a hybrid effect. H-adhesion experiment showed that this advanced cord had comparable adhesion to rubber as the standard polyester tire cord and could be used for production of tires.

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“…An important case of kinetics as carboxyl groups is the report of Zimmerman . The reaction rate was expressed as shown in eq k t = 1 10380 ( 1 − X c ) + C normalini × ln ( 10380 ( 1 − X c ) ( C ini + Δ[COOH] ) C normalini { 10380 false( 1 − X normalc false) − Δ[COOH] } ) C ini are initial carboxyl end groups [eq/10 6 g], Δ[COOH] represents increased number of carboxyl end groups, X c is the crystallinity [%], and t is the elapsed time [h].…”

Section: Resultsmentioning

confidence: 99%

Removal of Oligomers from Poly(ethylene terephthalate) Resins by Hydrothermal Extraction

Inagaki

Hirae

Sasaki

et al. 2013

Ind. Eng. Chem. Res.

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In this study, hydrothermal extraction experiments were performed in a semibatch apparatus at varying temperatures and different extraction times to determine the optimum operating conditions for the removal of oligomers from poly(ethylene terephthalate) (PET) resins. High-molecular-weight PET in pellet form (M w: 100 kDa) was used as the raw material. The results obtained suggest that hydrothermal treatment enables partial extraction of oligomers from PET resins. Using theoretical methods and the experimental data, we calculated the maximum reaction time at each temperature, considering the potential for application in plastic processing. A maximum extraction efficiency of 16% was achieved by hydrothermal extraction at 200 °C for 10 minutes. This novel technique is a promising tool for the development of a next-generation, low-oligomer, eco-friendly method in a short time.

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Degradation mechanisms of poly(ethylene terephthalate) tire yarn

Cited by 20 publications

References 14 publications

Hydrolytic degradation of poly(1,4-butylene terephthalate-co-tetramethylene oxalate) copolymer

Hydrolytic degradation of poly(1,4-butylene terephthalate-co-tetramethylene oxalate) copolymer

Preparation and characteristics of an advanced polyester tire cord with hybrid effect

Removal of Oligomers from Poly(ethylene terephthalate) Resins by Hydrothermal Extraction

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