Glass temperatures of some acrylic polymers

Krause, Sonja; Gormley, James J.; Roman, Nicholas; Shetter, John A.; Watanabe, Warren H.

doi:10.1002/pol.1965.100031020

Cited by 77 publications

(62 citation statements)

References 21 publications

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“…The latter increased with increasing add on, suggesting that it may be attributed to the grafted poly(BzMA) chains, i.e., to their glass transition temperature. 17 The thermomechanical behavior of untreated wool [ Fig. 5 ( a ) ] was characterized by a slight extension ( õ1% ) from room temperature to about 220ЊC, followed by a sharp contraction peak with a maximum at 242ЊC, preceding the final extension due to the beginning of wool polymer, 17 might be interpreted as a result of a…”

Section: Resultsmentioning

confidence: 99%

“…17 The changes in physical structure, Beche's line method, using a polarized microscope tensile properties, and thermal behavior, as well under the monochromatic light (Na light), in as surface morphology of poly(BzMA)-grafted standard conditions. wool fibers with different polymer add ons (from Tensile properties were measured in standard 7 to 180%) were studied as a function of the inconditions with a Tensilon UTM-II (Toyo Boldwin creasing add on values.…”

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confidence: 99%

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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%

mentioning

confidence: 99%

Graft copolymerization of benzyl methacrylate onto wool fibers

Tsukada

Shiozaki²,

Freddi

et al. 1997

J. Appl. Polym. Sci.

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“…The thermal characterisation of the amphiphilic triblock copolymers was performed by DSC. The T g s of the PDMAE-b-PCH-b-PDMAE amphiphilic triblock copolymers are also reported in the 61,62 The differences could be probably ascribed to the lower molecular weight, since it is well-established that glass transition temperature increases as molecular weight does up to reaching a constant value. 63 The thermograms of the PDMAE-b-PCH-b-PDMAE triblock copolymers as well as their corresponding homopolymers are represented in the Figure 2.…”

Section: Condensed State Properties Of the Triblock Copolymersmentioning

confidence: 89%

Synthesis of poly(di[methylamine]ethyl methacrylate)‐b‐poly(cyclohexyl methacrylate)‐b‐poly(di[methylamine]ethyl methacrylate) amphiphilic triblock copolymers by ATRP: Condensed‐phase and solution properties

Muñoz‐Bonilla¹,

Haddleton²,

Cerrada³

2007

J. Polym. Sci. A Polym. Chem.

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The synthesis of amphiphilic triblock copolymers, poly(di [methylamine]ethyl methacrylate)-b-poly(cyclohexyl methacrylate)-b-poly(di[methylamine]ethyl methacrylate) PDMAE-b-PCH-b-PDMAE, has been performed by atom transfer radical polymerisation. Those have been obtained in a well-controlled manner in terms of molecular weight and polydispersity index. The triblock copolymer characterisation has been made in condensed state and in solution. The existence of microphase separation has been confirmed by differential scanning calorimetry. However, the domains of both inner and outer blocks seem not to be ordered for one another from small-angle X-ray scattering (SAXS) measurements using synchrotron radiation. The micelle formation in dilute methanol solutions has been confirmed for all triblock copolymers by dynamic light scattering analyses. The size of these micelles has been demonstrated to be dependent on the molecular weight. Similar observations have been made in concentrate methanol solutions by using SAXS experiments, pointed also out that an increment of the intermicelle interactions is produced as the concentration increases.

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“…2). Les températures de transition vitreuse sont dans les intervalles observés pour de nombreux dérivés méthacryli-ques 12) .…”

Section: Résultats Et Discussionunclassified

Modélisation de la cinétique d'hydrolyse de dérivés poly(métha)acryliques et styréniques. Application à l'étude des polymères supports

Bichara

Monthéard²,

Taverdet

1998

Angew. Makromol. Chem.

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La réaction d'amines encombrées avec le chlorure d'acryloyle ou de méthacryloyle permet la synthèse d'amides acryliques et méthacryliques. Un ester de l'acide acrylique a été également préparé par réaction d'un alcool benzylique substitué, l'alcool 2,4‐dichlorobenzylique de même que celle d'un ester styrénique par réaction de l'acide benzoïque avec le chlorométhylstyrène. Ces monomères, excepté les amides méthacryliques ont été polymérisés et leurs hydrolyses en milieu acide ou basique ont été étudiées. L'étape qui limite la vitesse globale de la réaction est la diffusion du produit d'hydrolyse à travers la matrice de polymère. Une modélisation de cette libération, basée sur un coefficient de transfert de masse a été proposée. Ce modèle pourrait être employé pour beaucoup de réaction d'hydrolyse de polymères amorphes en milieu hétérogène.

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Glass temperatures of some acrylic polymers

Cited by 77 publications

References 21 publications

Graft copolymerization of benzyl methacrylate onto wool fibers

Graft copolymerization of benzyl methacrylate onto wool fibers

Synthesis of poly(di[methylamine]ethyl methacrylate)‐b‐poly(cyclohexyl methacrylate)‐b‐poly(di[methylamine]ethyl methacrylate) amphiphilic triblock copolymers by ATRP: Condensed‐phase and solution properties

Modélisation de la cinétique d'hydrolyse de dérivés poly(métha)acryliques et styréniques. Application à l'étude des polymères supports

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