Reactions induced by triphenyl phosphite addition during melt mixing of poly(ethylene terephthalate)/poly(butylene terephthalate) blends: influence of phosphite structure and polyester chain-end concentration

Jacques, B.; Devaux, Jacques; Legras, Roger; Nield, E.

doi:10.1016/0032-3861(96)00251-0

Cited by 16 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As shown in Figure 2, for the pure PLLA 0 , the melt torque (M) in the compounder decreased with increasing residence time at 160 C. This indicated that the PLLA was prone to degradation in the compounding process at the melting state. A similar relationship between the melt torque and molecular weight of PET was observed by Jacques et al 12 …”

Section: Resultssupporting

confidence: 79%

Preparation and characterization of high‐molecular‐weight poly(l‐lactic acid) by chain‐extending reaction with phosphites

Xie

Yang

2011

J of Applied Polymer Sci

View full text Add to dashboard Cite

Poly(L-lactic acid) (PLLA) of high molecular weight was prepared by a chain-extending reaction in a microcompounder. Phosphites were used as chain extenders to increase the molecular weight of the PLLA prepolymer, which was prepared by the bulk polycondensation of l-lactic acid. The effects of the amount of phosphite, the temperature, and the screw speed on the torque of the PLLA melt were studied. Under the optimal conditions, the molecular weight of PLLA increased from 62,100 to 126,000 g/mol. The chemical structure and crystallinity of PLLA were characterized by Fourier transform infrared spectroscopy, 1 H-NMR and 13 C-NMR, differential scanning calorimetry, and X-ray diffraction. The mechanical properties of PLLA were measured. The results indicate that triphenyl phosphite (TPPi) was an effective chain extender for PLLA. The role of the TPPi in chain extending is suggested to be an esterification-promotion agent.

show abstract

Section: Resultssupporting

confidence: 79%

Preparation and characterization of high‐molecular‐weight poly(l‐lactic acid) by chain‐extending reaction with phosphites

Xie

Yang

2011

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Nos estudos de Legras e colaboradores [12] envolvendo a extensão de PET na presença de TPP, foi determinado que a adição de 1,78% de TPP equivale a uma molécula de TPP por cadeia de poliéster. Levando em consideração tal afirmação e a possível evaporação de pequena quantidade de fosfito durante a mistura, escolheu-se a concentração de 2% de TPP como a melhor concentração a ser utilizada.…”

Section: Efeito Do Teor De Fosfito De Trifenilaunclassified

“…O aumento do peso molecular de poliésteres e poliamidas pode ser obtido de forma rápida pelo uso de extensores de cadeia [6][7][8][9][10][11][12][13][14] . Os extensores de cadeia são normalmente moléculas de baixa massa molar capazes de reagir com os grupos terminais de cadeia desses polímeros de condensação, promovendo a ligação entre cadeias.…”

Section: Introductionunclassified

Extensão de Cadeia em Poli(Naftalato de Etileno) pelo Fosfito de Trifenila

Dias

Silva

2001

Polímeros

View full text Add to dashboard Cite

O processamento reativo de poli(naftalato de etileno) (PEN) na presença de fostito de trifenila (TPP) em um misturador interno acoplado ao reômetro de torque foi investigado. O acompanhamento do torque e da temperatura durante o processamento revelou a ocorrência de reações de extensão de cadeia. A massa molecular do poliéster aumentou com o tempo de processamento, passando por um máximo, após o qual começa a decrescer como resultado de degradação molecular acelerada pela presença de subprodutos da extensão de cadeia. A intensidade das reações de extensão de cadeia aumenta com o aumento do teor de TPP, da temperatura e do cisalhamento. Tanto a extensão de cadeia quanto a degradação ocorrem mais lentamente para o PEN que para o poli(tereftalato de etileno). A presença de TPP no material provoca modificações na Tg, devido a um efeito de plastificação, e aumenta a velocidade de cristalização.

show abstract

“…Phosphites react with hydroxyl and carboxyl end groups of PET to diminish the possibility of their reaction via hydrolysis. They can also reduce the hydroperoxides to alcohol in polyolefins [3][4][5][6] according to the following reaction:…”

Section: Introductionmentioning

confidence: 99%

Rheological and mechanical properties of recycled poly(ethylene terephtalate)/high density polyethylene blends

Guessoum

Medjdoub

Nekkaa

et al. 2013

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract. Triphenylphosphite (TPP) has been used as a chain extender to regenerate polyethylene terephtalate (PET) and high density polyethylene (HDPE) wastes and to improve the properties of PET/HDPE system based on recycled materials. TPP incorporation in PET and HDPE showed a noticeable increase of the torque as a function of the mixing time and proved that the degradation reactions are considerably decreased. In the case of PET/ HDPE blends, the increase of the torque was strongly dependent on the composition of the homopolymers and on the time of mixing. TPP incorporation contributed to significant variations of the rheological and mechanical properties of the regenerated PET and HDPE and their blends.

show abstract

Reactions induced by triphenyl phosphite addition during melt mixing of poly(ethylene terephthalate)/poly(butylene terephthalate) blends: influence of phosphite structure and polyester chain-end concentration

Cited by 16 publications

References 10 publications

Preparation and characterization of high‐molecular‐weight poly(l‐lactic acid) by chain‐extending reaction with phosphites

Preparation and characterization of high‐molecular‐weight poly(l‐lactic acid) by chain‐extending reaction with phosphites

Extensão de Cadeia em Poli(Naftalato de Etileno) pelo Fosfito de Trifenila

Rheological and mechanical properties of recycled poly(ethylene terephtalate)/high density polyethylene blends

Contact Info

Product

Resources

About