Degradation cracking of poly(ethylene terephthalate) filaments by methylamine andN-propylamine

Kish, Mohammad Haghighat; Borhani, Shahin

doi:10.1002/1097-4628(20001209)78:11<1923::aid-app110>3.0.co;2-u

Cited by 18 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such a phenomenon could bring about a plateau value after a peak in the number of amines present on PCL due to the detachment of the interested portion of the PCL chain at a longer time of treatment. Crack formation as well as a massive loss of mechanical properties after partial degradation during aminolysis is already reported, mainly in the case of PET. , The influence on bulk properties and the control over the surface chemistry and evolution during the treatment of its physicochemical properties were studied as key aspects. In particular, it was demonstrated that the bulk mechanical properties are not significantly affected by aminolysis in the proposed reaction conditions.…”

Section: Discussionmentioning

confidence: 99%

Surface Investigation on Biomimetic Materials to Control Cell Adhesion: The Case of RGD Conjugation on PCL

et al. 2010

View full text Add to dashboard Cite

The cell recognition of bioactive ligands immobilized on polymeric surfaces is strongly dependent on ligand presentation at the cell/material interface. While small peptide sequences such as Arg-Gly-Asp (RGD) are being widely used to obtain biomimetic interfaces, surface characteristics after immobilization as well as presentation of such ligands to cell receptors deserve more detailed investigation. Here, we immobilized an RGD-based sequence on poly(epsilon-caprolactone) (PCL), a largely widespread polymeric material used in biomedical applications, after polymer aminolysis. The surface characteristics along with the efficacy of the functionalization was monitored by surface analysis (FTIR-ATR, contact angle measurements, surface free energy determination) and spectrophotometric assays specially adapted for the analytical quantification of functional groups and/or peptides at the interface. Particular attention was paid to the evaluation of a number, morphology, and penetration depth of immobilized functional groups and/or peptides engrafted on polymeric substrates. In particular, a typical morphology in peptide distribution was evidenced on the surface raised from polymer crystallites, while a significant penetration depth of the engrafted molecules was revealed. NIH3T3 fibroblast adhesion studies verified the correct presentation of the ligand with enhanced cell attachment after peptide conjugation. Such work proposes a morphological and analytical approach in surface characterization to study the surface treatment and the distribution of ligands immobilized on polymeric substrates.

show abstract

Section: Discussionmentioning

confidence: 99%

Surface Investigation on Biomimetic Materials to Control Cell Adhesion: The Case of RGD Conjugation on PCL

et al. 2010

View full text Add to dashboard Cite

show abstract

“…From this functional group transformation, PET was modified or degraded by reaction with various amines. For instance, PET fiber surface was modified by using 3-aminopropyltriethoxysilane [2,3], n-butylamine vapor and aqueous nbutylamine [4], n-propylamine and methylamine [5], by diamines [6] or by multifunctional amines [7]. The aminolytic depolymerization of PET with ethanolamine has been investigated under reflux in the presence of glacial acetic acid, Trang 102 sodium acetate and potassium sulphate, as catalysts [8], or under microwave energy and using catalysts [9], or under microwave irradiation and without the use of any catalyst [10].…”

Section: Introductionmentioning

confidence: 99%

Aminolysis of poly(ethylene terephthalate) waste bottle with tetra/hexamethylene diamine and characterization of alpha, ohmega-diamine products

Hoang

Dang

2017

Sci. Tech. Dev. J. - Nat. Sci.

View full text Add to dashboard Cite

The aminolysis of poly(ethylene terephthalate) (PET) waste bottle with excess amount of aliphatic diamines, such as tetramethylenediamine (TMDA) and hexamethylenediamine (HMDA) without catalyst has been carried out. Each trimers and pentamers in the obtained products were isolated and characterized by FTIR, NMR, HPLC methods. Although an excess of diamine was employed, longer blocks of oligomers were still formed as minor products.

show abstract

“…Several authors reported the aminolysis reaction of esters by amines. All these reports can be divided into two fields, that is, study of PET morphology18, 19 or application of the aminolysis to practical uses 20. This reaction is based on the nucleophilic reaction of an amine with the ester bonds along a polymer chain and results in polymer‐chain scission.…”

Section: Introductionmentioning

confidence: 99%

Chemical surface modification of poly(ethylene terephthalate) fibers by aminolysis and grafting of carbohydrates

Bech

Meylheuc²,

Lepoittevin

et al. 2007

J. Polym. Sci. A Polym. Chem.

139

126

View full text Add to dashboard Cite

PET is a semicrystalline thermoplastic polyester used in many fields. For a variety of applications, however, it is necessary to impart desired properties by introducing specific functional groups on the surface. Aminolysis of PET fibers with diamines (1,2-diaminoethane, 1,6-diaminohexane, 3,6-dioxa-1,8-diaminooctane, and 4,9-dioxa-1,12-diaminododecane) gives amino functional groups on the surface. The effects of temperature, reaction time, diamine concentration, and solvent employed for the grafting were studied. The graft yield was observed to increase with temperature, reaction time, and diamine concentration. Aminolysis affects greatly the geometry and surface morphology of PET fibers as observed by scanning electronic microscopy and atomic force microscopy in tapping mode. A decrease of fibers diameter and an increase of surface heterogeneity and roughness due to chemical degradation is observed. Amino groups on the surface were used to prepare glycosylated fibers by reductive amination or amidation with different carbohydrates as maltose, maltotriose, and maltohexaose. The study reveals that the yield is dependent on the initial amino groups' surface concentration and the molar mass of the carbohydrate. These surfaces could benefit to a wide range of applications in the biomedical field.

show abstract

Degradation cracking of poly(ethylene terephthalate) filaments by methylamine andN-propylamine

Cited by 18 publications

References 23 publications

Surface Investigation on Biomimetic Materials to Control Cell Adhesion: The Case of RGD Conjugation on PCL

Surface Investigation on Biomimetic Materials to Control Cell Adhesion: The Case of RGD Conjugation on PCL

Aminolysis of poly(ethylene terephthalate) waste bottle with tetra/hexamethylene diamine and characterization of alpha, ohmega-diamine products

Chemical surface modification of poly(ethylene terephthalate) fibers by aminolysis and grafting of carbohydrates

Contact Info

Product

Resources

About