Determination of Mark–Houwink parameters of ethylene–norbornene copolymers and molecular characteristics estimation

Yao, Zhen; Li, Shaojie; Lv, Fei; Cao, Kun

doi:10.1002/app.28498

Cited by 8 publications

(5 citation statements)

References 22 publications

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“…The preparation of the E-NB copolymer and E-NB-P terpolymer samples used in this work had been reported in literature. [21][22][23][24] The composition, molecular weight, and PDI data were cited from the sources.…”

Section: Methodsmentioning

confidence: 99%

Influence of chain microstructure on ethylene–norbornene copolymer film properties

Yao

Chen

et al. 2011

J of Applied Polymer Sci

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The effects of copolymer composition, copolymer composition distribution, and polar a-olefin incorporation on transparency, refractive index, and hydrophilicity of resultant ethylene-norbornene copolymer films were investigated. It has been found that the transparency is mainly determined by the copolymer composition distribution. The samples having uniform compositions gave better transparency. However, the copolymer composition distribution had little effect on refractive index. The refractive index increased linearly with increasing norbornene content. Furthermore, the incorporation of polar a-olefin with long carbon chain improved refractive index and hydrophilicity of the films.

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Section: Methodsmentioning

confidence: 99%

Influence of chain microstructure on ethylene–norbornene copolymer film properties

Yao

Chen

et al. 2011

J of Applied Polymer Sci

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“…Table 1 summarized G e and M e of comb-like polymers. Different from other reported comb-like polymers that have a very low G e and show a several dozen times increase in M e , 25 it was found that the reduced M e (∼3.5 × 10 4 g/mol and ∼4.6 × 10 4 g/mol) of two weakly phase-separated samples is only several times larger than that of the corresponding linear polymer chains (∼17400 g/mol), 42 and the strongly phaseseparated sample has a M e (∼1.7 × 10 4 g/mol) comparable to that of linear polymer chains. Table 1 also shows that M e of other comb-like polymers is comparable to or larger than that of linear polymer chains.…”

Section: Influence Of Structure Parameters On Linear Rheological Beha...mentioning

confidence: 99%

Topology and Dynamic Regulations of Comb-like Polymers as Strong Adhesives

et al. 2023

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Strong adhesives as structural load-bearing materials can provide both adhesive bonding to substrate surfaces and cohesive bonding throughout the bulk material, which are widely used in the cement nail, electronic device, and automotive industries. By a molecular topological regulation, in this work, we developed a series of strong adhesives based on comb-like polymers. By systematically regulating the topological parameters including the side chain length, the spacer between side chains, and the degree of polymerization of the overall backbone, comprehensive studies on linear rheology (the terminal relaxation time and zero viscosity) and non-linear debonding adhesion (the work of adhesion) are performed on these comb-like polymers. It was found that the rheological behaviors depend not only on the structure parameters but also on whether or not the samples exhibit phase separation. Moreover, regardless of the topological structure of comb-like polymers with strong and weak phase separation, the universal work of adhesion is observed to be dependent on the multiplication of terminal relaxation time and the debonding rate, indicating dynamic control over the nonlinear work of adhesion. Furthermore, comb-like polymers are feasible to bind with diverse substrates, including glass, polypropylene and polyethylene terephthalate, wood, and metal. In comparison to existing works using dynamic physical or chemical bonds, molecular topology regulation is more easily fulfilled in strong adhesives without the use of additives and complicated chemical and physical modifications, lowering the barrier for practical applications.

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“…The method of Ruchatz and Fink was adopted for the chemical shift assignments and copolymer composition estimates: 3 mol %Norbornene The molecular weight and molecular weight distribution were measured at 1508C in 1,2,4-trichlorobenzene using a Waters GPCV 2000 with a combined refractive index and viscosity detector. 35 …”

Section: Characterization and Measurementsmentioning

confidence: 99%

Model development for semicontinuous production of ethylene and norbornene copolymers having uniform composition

Cao

Yao

et al. 2009

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).Terminal and penultimate models for controlling copolymer composition distribution (CCD) in ethylene and norbornene (NB) copolymerization were developed by taking into account the variation of active site concentration with the initial comonomer ratio. The models were validated by batch polymerization experimental data. The terminal model gave better correlation with the composition data whereas the penultimate model had a better fit to the rate data. The terminal model was then used to design NB feeding policies in semicontinuous processes for targeted CCD profiles. Based on the model results, a series of ethylene-NB copolymers with various NB contents were prepared. With the same NB content, the semicontinuous process produced a uniform composition, whereas the batch process yielded broad CCD. The batch samples had lower T g values and broader transition ranges, even yielded crystalline materials. In contrast, the semicontinuous samples overcame the disadvantages. (a) Copolymer yield vs. reaction time; (b) NB conversion vs. reaction time. Conditions: catalyst concentration 5 4 3 10 25 mol/l, Al/Zr 5 1500, toluene 5 50 ml, P 5 1 atm, T 5 708C, initial NB/E 5 19.6, total reaction time 5 90 min. Conditions: catalyst concentration 5 4 3 10 25 mol/l, Al/Zr 5 1500, toluene 5 50 ml, P 5 1 atm, T 5 708C.Figure 5. Copolymer yield/NB conversion vs. reaction time in the batch process for initial NB/E 5 1.3 (For the model calculation, c * varies with the initial NB/E according to Figure 4). (a) Copolymer yield vs. reaction time; (b) NB conversion vs. reaction time. Conditions: catalyst concentration 5 4 3 10 25 mol/l, Al/Zr 5 1500, toluene 5 50 ml, P 5 1 atm, T 5 708C, initial NB/E 5 1.3, total reaction time 5 10 min.

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Determination of Mark–Houwink parameters of ethylene–norbornene copolymers and molecular characteristics estimation

Cited by 8 publications

References 22 publications

Influence of chain microstructure on ethylene–norbornene copolymer film properties

Influence of chain microstructure on ethylene–norbornene copolymer film properties

Topology and Dynamic Regulations of Comb-like Polymers as Strong Adhesives

Model development for semicontinuous production of ethylene and norbornene copolymers having uniform composition

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