Influence of chain microstructure on ethylene–norbornene copolymer film properties

Li, Shaojie; Yao, Zhen; Chen, Lin; Dai, Bin-Bin; Cao, Kun; Li, Bo‐Geng; Zhu, Shiping

doi:10.1002/app.33785

Cited by 6 publications

(9 citation statements)

References 27 publications

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“…35, 36 These investigations showed that an increase in the mol% of norbornene increased the refractive index of the thermoplastic. Liu et al .…”

Section: Introductionmentioning

confidence: 98%

“…A relationship between norbornene mol% and the refractive index of the substrate has been noted. 35,36 These investigations showed that an increase in the mol% of norbornene increased the refractive index of the thermoplastic. Liu et al also showed that the copolymer composition distribution had a significant effect on the refractive index and transparency.…”

Section: Introductionmentioning

confidence: 99%

“…For the same mol% of norbornene, the transparency of uniform compositions was higher when compared to non-uniform COC. 36 …”

Section: Introductionmentioning

confidence: 99%

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Characterization of activated cyclic olefin copolymer: effects of ethylene/norbornene content on the physiochemical properties

O'Neil

Taylor

Ratnayake

et al. 2016

Analyst

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The ethylene/norbornene content within cyclic olefin copolymer (COC) is well known to affect the chemical and physical properties of the copolymer, such as the glass transition temperature (Tg) and transparency. However, no work has been reported evaluating the effects of the ethylene/norbornene content on the surface properties of COC following UV/O3 or O2 plasma activation. Activation with either O2 plasma or UV/O3 is often used to assist in thermal assembly of fluidic devices, increasing the wettability of the surfaces, or generating functional scaffolds for the attachment of biological elements. Thus, we investigated differences in the physiochemical surface properties of various ethylene/norbornene compositions of COC following activation using analytical techniques such as water contact angle (WCA), ATR-FTIR, XPS, TOF-SIMS, UV-VIS, AFM and a colorimetric assay utilizing Toluidine Blue O (TBO). Results showed that increased norbornene content led to the generation of more oxygen containing functionalities such as alcohols, ketones, aldehydes and carboxyl groups when activated with either UV/O3 or O2 plasma. Specifically, COC with ~60% norbornene content showed a significantly higher –COOH functional group density when compared to COC with a 50% norbornene content and COC with a 35% norbornene content following UV/O3 or O2 plasma activation. Furthermore, COC with large norbornene contents showed a smaller average RMS roughness (0.65 nm) when compared to COC containing low norbornene contents (0.95 nm) following activation making this substrate especially suited for nanofluidic applications, which require smooth surfaces to minimize effects arising from dielectrophoretic trapping or non-specific adsorption. Although all COC substrates showed >90% transparency at wavelengths >475 nm, COC possessing high norbornene contents showed significantly less transparency at wavelengths below 475 nm following activation, making optical detection in this region difficult. Our data showed distinct physiochemical differences in activated COC that was dependent upon the ethylene/norbornene content of the thermoplastic and thus, careful selection of the particular COC grade must be considered for micro- and nanofluidics.

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“…35, 36 These investigations showed that an increase in the mol% of norbornene increased the refractive index of the thermoplastic. Liu et al .…”

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of activated cyclic olefin copolymer: effects of ethylene/norbornene content on the physiochemical properties

O'Neil

Taylor

Ratnayake

et al. 2016

Analyst

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“…The uniformity of copolymer composition has a great influence on its property, however, it is very difficult to control unless the copolymerization is conducted in the steady state of the continuous reactor with ideal full back‐mixing. Especially in laboratory research, the copolymerization of monomers with different reactivity is often carried out in a batch reactor.…”

Section: Introductionmentioning

confidence: 99%

Real‐Time Detection of Atmosphere Composition in Three‐Component Gas‐Phase Copolymerization of Olefins

Zhang

Yang

Huang

et al. 2018

Macro Reaction Engineering

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The uniformity of copolymer composition has a great influence on its properties; however, it is very difficult to control. Especially in the laboratory research of the multi‐component gas‐phase copolymerization of olefins, the polymerization is usually conducted in a batch reactor, and the composition of the resulting copolymers is often distributed very widely. The samples of such copolymers are in fact not representative. Detection and control of the atmospheric composition in the batch reactor during olefin gas‐phase copolymerization is of great significance for the control of the uniformity of copolymer composition. In this work, a method based on three flow meters in series has been developed for real‐time detection of the atmospheric composition in olefin gas‐phase copolymerization with a delay time of less than 3 s. The method is applicable to copolymerization of up to a ternary system, including the binary copolymerization of olefins with hydrogen modulation of molecular weight or the ternary copolymerization of olefins. The consumption rate of each monomer is also online measured.

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“…Cyclic olefin copolymers are versatile materials categorized as engineering thermoplastics . The random and alternative attachment of cyclo‐olefins such as cyclohexene, cycloheptene or norbornene into the polyolefinic backbone results in amorphous copolymers with high glass transition temperature, superior transparency, low shrinkage and good mechanical properties .…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, rheological and thermal behavior of metallocene ethylene − norbornene copolymers with low norbornene content using pentafluorophenol modified methylaluminoxane

Manteghi

Arabi

Jahani

2015

Polymer International

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Ethylene − norbornene copolymers were synthesized using rac-ethylene bis(indenyl) zirconium dichloride/pentafluorophenol modified methylaluminoxane. First, the effect of using a modifier in combination with a low ratio of Al/Zr on the catalyst activity and co-monomer incorporation was studied. The results of copolymerization reveal a 20% co-monomer incorporation improvement and a rise of activity by 2-fold in the presence of the modifier. Rheological measurements show a higher molecular weight in copolymers synthesized using modified methylaluminoxane. The alternative and dyad block microstructures of copolymers become possible in the case of a norbornene content of more than 14 mol%. Second, the effect of co-monomer content on the rheological and thermal behavior of the synthesized copolymers was investigated. The results of the rheological study indicate a lower molecular weight in samples containing a higher norbornene content. Dynamic mechanical thermal analysis confirms the influence of different microstructures on the glass transition temperature. The crystal structure of copolymers having a higher molecular weight is emphasized using wide angle X-ray scattering and DSC even with a greater incorporation of norbornene.

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Influence of chain microstructure on ethylene–norbornene copolymer film properties

Cited by 6 publications

References 27 publications

Characterization of activated cyclic olefin copolymer: effects of ethylene/norbornene content on the physiochemical properties

Characterization of activated cyclic olefin copolymer: effects of ethylene/norbornene content on the physiochemical properties

Real‐Time Detection of Atmosphere Composition in Three‐Component Gas‐Phase Copolymerization of Olefins

Synthesis, characterization, rheological and thermal behavior of metallocene ethylene − norbornene copolymers with low norbornene content using pentafluorophenol modified methylaluminoxane

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