Effects of molecular structure and composition on rheological behaviour of (methylmethacrylate N-phenylmaleimide) copolymers

Menges, Melanie; Schmidt‐Naake, Gudrun

doi:10.1016/s0032-3861(98)00273-0

Cited by 10 publications

(11 citation statements)

References 14 publications

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“…This is the reason why those compatibilized blends exhibit higher G′ and G″ than the incompatibilized blends. In addition, different than the incompatibilized blends, the G′ and G″ curves show cross‐over in the compatibilized blends (shown by an arrow) that indicate relaxation of branches formed due to the presence of PDI and increasing polydispersity index …”

Section: Resultsmentioning

confidence: 99%

Reactive compatibilization of PLA/TPU blends with a diisocyanate

Dogan

Reyes

Rastogi

et al. 2013

J of Applied Polymer Sci

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This study focuses on the compatibilization of poly(lactic acid) (PLA)/thermoplastic polyurethane (TPU) blends by using 1,4 phenylene diisocyanate (PDI) for the first time, as the compatibilizer. Because of the potential interactions of diisocyanates with OH/COOH, they are useful for reactive processing of PLA/TPU blends in the melt processing. To have insight on the reactively compatibilized structure of PLA/TPU blends, phase morphologies are observed by means of scanning electron microscopy. The mechanical, thermal, and rheological responses of the blends are investigated. The observations are that the brittle behavior of PLA changes to ductile with the addition of TPUs. The addition of PDI improves the tensile properties of the blends. The compatibilization action of PDI is monitored with DMA and rheological experiments. Cross‐over in the G′ and G″ curves of compatibilized blends indicates the relaxation of branches formed in the presence of PDI. The dispersed phase size of TPU decreases in PLA in the presence of PDI due to the improved compatibility. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40251.

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Section: Resultsmentioning

confidence: 99%

Reactive compatibilization of PLA/TPU blends with a diisocyanate

Dogan

Reyes

Rastogi

et al. 2013

J of Applied Polymer Sci

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“…24 In the present work it was not possible to observe the T g of homo poly(NPM) in the DSC traces and therefore the value 598 K was taken from the literature 24. Actually, various values for the T g of PNPM are reported in the literature,11 and this could explain the difference between the obtained values and the calculated ones.…”

Section: Resultsmentioning

confidence: 95%

“…The comonomer chosen for this work was N ‐phenylmaleimide (NPM). NPM is a 1,2‐disubstituted ethylenic monomer with the inherent advantage of hindered rotation of the imide residues around the polymeric backbone, thus providing high thermal stability, and also the opportunity for tuning the polymer properties by changing the substituent at the N‐atom 9–11…”

Section: Introductionmentioning

confidence: 99%

Ecological risk assessment of parent and halogenated polycyclic aromatic hydrocarbons in surface sediments from an urban river in south China

Sun

Zeng

2012

Enviro Toxic and Chemistry

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In the present study, 16 priority polycyclic aromatic hydrocarbons (Σ(16) PAHs), including seven carcinogenic PAHs (Σ(7) PAHs) designated by the U.S. Environmental Protection Agency, in surface sediment from an urban river (Shenzhen, south China) were measured. The concentrations of Σ(16) PAHs and Σ(7) PAHs ranged from 27.92 to 7409 ng/g and 0.53 to 2326 ng/g, respectively. Source appointments indicated that the PAHs in surface sediments were mainly derived from coal combustion (36.6%), oil spills (22.2%), vehicle emission (19.5%), and waste incineration (12.1%). The ecological risks posed by PAHs and several halogenated PAHs in these sediment samples were assessed using two redefined guidelines incorporating the toxic equivalency quotients (TEQs) of individual PAH congeners: (1) TEQs effect range-low, and (2) TEQs effect range-median. The authors' results suggested that the PAHs they measured in most of the sediments in this urban river would not cause acute biological effects. On the contrary, the ecological risk posed by some halogenated PAHs was much higher than that of their corresponding parent PAHs. Finally, the relationships between PAH levels and catchment urbanization processes were examined. The results indicated that rapid urbanization has led to an obvious increase in PAH contamination in surface sediments.

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“…These conflicting properties can be optimized by using the copolymerization technique [5−8] which enables us to control the concentrations of the hard and soft segments as well as the chromophores. The microstructure of copolymers plays a determining influence on their properties, [9] and a better understanding of the relationship between different parameters (composition, temperature, molecular weight, etc.) and the flow properties is very important from the standpoints of both polymer preparation and polymer processing.…”

Section: Introductionmentioning

confidence: 99%

Rheological Investigations of Copolymers of N-(Substituted Maleimide)s with Styrene in Dimethylsulfoxide

Morariu¹,

Bercea²,

Hulubei³

2008

Journal of Macromolecular Science, Part B

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The viscoelastic behavior of poly (N-(4-formylphenoxy-4 -carbonylphenyl)maleimideco-styrene) and poly (N-(4-carboxyphenyl)maleimide-co-styrene) in dimethylsulfoxide is investigated. The rheological parameters (elastic modulus, viscous modulus, loss tangent) were determined at different temperatures in the range 20 • C-80 • C. Poly (N-(4-carboxyphenyl) maleimide-co-styrene) exhibits a Newtonian behavior in the frequency range from 0.05 to 700 rad/s at all temperatures. For poly(N-(4-formylphenoxy-4 -carbonylphenyl)maleimide-co-styrene), a shear thinning behavior was observed at temperatures below 40 • C (pseudoplastic behavior), whereas at higher temperatures the sample exhibits Newtonian flow throughout the studied frequencies range. The activation energies of the flow (calculated by using the zero shear viscosity values) giveindications about the intensity of polymer-polymer interactions as a function of the maleimide monomer structure.

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Effects of molecular structure and composition on rheological behaviour of (methylmethacrylate N-phenylmaleimide) copolymers

Cited by 10 publications

References 14 publications

Reactive compatibilization of PLA/TPU blends with a diisocyanate

Reactive compatibilization of PLA/TPU blends with a diisocyanate

Ecological risk assessment of parent and halogenated polycyclic aromatic hydrocarbons in surface sediments from an urban river in south China

Rheological Investigations of Copolymers of N-(Substituted Maleimide)s with Styrene in Dimethylsulfoxide

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