Thermal properties of wool‐<i>g</i>‐poly(methyl methacrylate) copolymers

Vellaichamy, Elangovan; Saccubai, S.

doi:10.1002/app.1992.070451016

Cited by 7 publications

(2 citation statements)

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“…with different thermal stability, belonging to sepThe storage component of the dynamic modulus arated fiber domains. [23][24][25][26][27][28][29] With increasing add on of untreated wool [ Fig. 4(a)] decreased slightly of poly(BzMA)-grafted wool fibers, the intensity in the low temperature range, from 050 to 20ЊC, of the endotherm in the high-temperature side and then remained stable until about 165-170ЊC.…”

Section: Resultsmentioning

confidence: 99%

Graft copolymerization of benzyl methacrylate onto wool fibers

Tsukada

Shiozaki²,

Freddi

et al. 1997

J. Appl. Polym. Sci.

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Benzyl methacrylate (BzMA) was graft copolymerized onto wool fibers by using ammonium peroxydisulphate as the initiator. Grafted samples with different polymer add ons (from 7 to 180%) were obtained by varying the monomer concentration in the reaction system. Following grafting with BzMA, the X-ray diffraction peak at 20.2Њ slightly moved towards higher spacing values. Birefringence decreased, indicating a lower degree of molecular orientation of grafted wool fibers. The equilibrium regain values of grafted wool decreased with increasing add on. Tensile strength increased in the range 45-77% add on, while elongation at break decreased. Differential scanning calorimetry (DSC) and thermogravimetry (TG) measurements showed a higher thermal stability for grafted wool. Following grafting, the drop of dynamic storage modulus (E) shifted to a lower temperature. Accordingly, the intensity of the loss modulus (EЉ) peak decreased, indicating that the thermally induced molecular motion was enhanced by grafting. Thermomechanical analysis (TMA) confirmed the increase in chain mobility for the grafted wool fibers. Above 35-40% add on, the presence of homopolymer on the surface of the wool fibers was identified by scanning electron microscopy.

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Section: Resultsmentioning

confidence: 99%

Graft copolymerization of benzyl methacrylate onto wool fibers

Tsukada

Shiozaki²,

Freddi

et al. 1997

J. Appl. Polym. Sci.

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“…Concerning polyacrylates, Elangovan and Saccubai observed that the graft copolymerization of methyl methacrylate (MMA) onto the wool surface improves the acid/alkali resistances and the dye uptake, also increasing the wool's tensile strength [139] and thermal properties [140]. Xu et al [141] studied the graft polymerization of hydroxyethyl methacrylate (HEMA) onto woollen fabrics by microwave irradiation, yielding a much higher graft add-on by improving the monomer's reactivity in comparison to conventional heating.…”

Section: Polyacrylates Polyacrylonitrile (Pan) and Polyacrylamide (Pam)mentioning

confidence: 99%

Keratin Associations with Synthetic, Biosynthetic and Natural Polymers: An Extensive Review

Donato

Mija

2019

Polymers

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Among the biopolymers from animal sources, keratin is one the most abundant, with a major contribution from side stream products from cattle, ovine and poultry industry, offering many opportunities to produce cost-effective and sustainable advanced materials. Although many reviews have discussed the application of keratin in polymer-based biomaterials, little attention has been paid to its potential in association with other polymer matrices. Thus, herein, we present an extensive literature review summarizing keratin’s compatibility with other synthetic, biosynthetic and natural polymers, and its effect on the materials’ final properties in a myriad of applications. First, we revise the historical context of keratin use, describe its structure, chemical toolset and methods of extraction, overview and differentiate keratins obtained from different sources, highlight the main areas where keratin associations have been applied, and describe the possibilities offered by its chemical toolset. Finally, we contextualize keratin’s potential for addressing current issues in materials sciences, focusing on the effect of keratin when associated to other polymers’ matrices from biomedical to engineering applications, and beyond.

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