Effect of solid‐state stress induced reaction on morphology and structure of metallocene polyethylene

Zou, Huawei; Chen, Yang; Liang, Mei; Liu, Pengbo

doi:10.1002/app.39355

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…It is well known that break point of molecular chain is probably in the middle part. The possible reactions can be expressed as follows: Direct chain scission:

\begin{matrix} \sim {CH}_{2^{}} {CH}_{2^{}} {CH}_{2^{}} {CH}_{2} \sim \to \sim {CH}_{2^{}} {CH}_{2} \cdot + \cdot {CH}_{2^{}} {CH}_{2^{\sim}} + 2 H \\ \to \sim {CH}_{2^{}} {CH}_{3} + {CH}_{3^{}} {CH}_{2 \sim} \end{matrix}

Formation of new chain:

{CH}_{3^{}} {CH}_{2^{}} {CH}_{2^{}} \sim + \cdot {CH}_{2^{}} {CH}_{2^{}} \sim \to {CH}_{3^{}} {CH}_{2^{}} {CH}_{2^{}} {CH}_{2^{}} {CH}_{2 \sim}

Formation of long chain branches:

\begin{matrix} \sim {CH}_{2^{}} {CH}_{2^{}} {CH}_{2} \sim \to \sim {CH}_{2^{}} CH \cdot ‐ {CH}_{2} \\ \sim {CH}_{2^{}} {CH}_{2 \sim} \to \sim {CH}_{2} \cdot \\ \sim {CH}_{2^{}} CH \cdot \sim {CH}_{2^{}} + \sim {CH}_{2} \cdot \to \sim {CH}_{2^{}} CH (_{{CH}_{2 ...}} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Effect of solid‐state shear milling on structure and properties of HDPE/UHMWPE blends

Yang

Zou

et al. 2013

J of Applied Polymer Sci

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The structure and properties of HDPE/UHMWPE blends prepared through a pan-milling reactor in solid state at ambient temperature were compared with the blends made by melt mixing. The changes of structure and properties of the blends were investigated by FTIR, melt flow index, mechanical properties, dynamic rheological measurement, DSC, and WAXD. DSC measurement illustrated that after pan-milling treatment, the half-width of the melting temperature became smaller. The more content of UHMWPE added in the blend, the more evident change was observed. Combined with the dynamic rheological analysis, it was proved that, the pan-milling treatment can improve the compatibility of the HDPE/UHMWPE blends. X-ray diffraction analysis showed that after pan-milling treatment some ordered structure could be induced, but after heat treatment, the induced crystalline structure disappeared. The tensile properties of pan-milled HDPE/UHMWPE blends also achieved improvement after pan milling treatment.

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“…It is well known that break point of molecular chain is probably in the middle part. The possible reactions can be expressed as follows: Direct chain scission:

\begin{matrix} \sim {CH}_{2^{}} {CH}_{2^{}} {CH}_{2^{}} {CH}_{2} \sim \to \sim {CH}_{2^{}} {CH}_{2} \cdot + \cdot {CH}_{2^{}} {CH}_{2^{\sim}} + 2 H \\ \to \sim {CH}_{2^{}} {CH}_{3} + {CH}_{3^{}} {CH}_{2 \sim} \end{matrix}

Formation of new chain:

{CH}_{3^{}} {CH}_{2^{}} {CH}_{2^{}} \sim + \cdot {CH}_{2^{}} {CH}_{2^{}} \sim \to {CH}_{3^{}} {CH}_{2^{}} {CH}_{2^{}} {CH}_{2^{}} {CH}_{2 \sim}

Formation of long chain branches:

\begin{matrix} \sim {CH}_{2^{}} {CH}_{2^{}} {CH}_{2} \sim \to \sim {CH}_{2^{}} CH \cdot ‐ {CH}_{2} \\ \sim {CH}_{2^{}} {CH}_{2 \sim} \to \sim {CH}_{2} \cdot \\ \sim {CH}_{2^{}} CH \cdot \sim {CH}_{2^{}} + \sim {CH}_{2} \cdot \to \sim {CH}_{2^{}} CH (_{{CH}_{2 ...}} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Effect of solid‐state shear milling on structure and properties of HDPE/UHMWPE blends

Yang

Zou

et al. 2013

J of Applied Polymer Sci

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“…However, in the previous work, PEN resins are very difficult to form crosslink network without the catalysts because of steric hindrance of the pendant nitriles groups on the polymer chains and the high curing temperature (>300 8C) have enormously limited the application of the reinforced composites. [20][21][22] Phthalonitrile containing benzoxazine (BA-ph) resins have widely studied for the preparation of resin matrix composites because of their excellent performance, such as high glass transportation temperature, near-zero shrinkage, low water absorption, high fire-retardant ability, and outstanding thermal and mechanical properties. Moreover, the low-temperature curing and self-catalyzed polymerization have made it a novel potential high-performance thermosetting resin.…”

Section: Introductionmentioning

confidence: 99%

Design of the phthalonitrile‐based composite laminates by improving the interfacial compatibility and their enhanced properties

Ren

Lei

Pan

et al. 2017

J of Applied Polymer Sci

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Phthalonitrile containing benzoxazine (BA‐ph) and cyanate ester (CE) were chosen as the thermosetting matrix and the glass fiber (GF) reinforced laminates formed at low temperature were designed. The polyarylene ether nitriles containing pendent carboxyl groups (CPEN) was selected to modify the interfacial interaction between the resin matrix and GFs. Two methods of introducing CPEN were compared and the effects of CPEN on curing behaviors and properties of the composites were investigated. Results showed that with the CPEN, exothermic peaks shifted to lower temperature and curing temperatures of BA‐ph/CE decreased slightly. The mechanical and thermal properties of GF‐reinforced composites were discussed and the results indicated that the composites of modified GFs with CPEN exhibited outstanding mechanical properties, higher glass transition temperature (Tg > 290 °C) than that of composites composed of CPEN mixed with BA‐ph/CE. Moreover, GF‐reinforced composites showed stable dielectric constants (3.8–4.5) and low dielectric loss (0.005–0.01), which were independent of the frequency. In sum, the various methods of the introduction of CPEN in the GF‐reinforced composites may provide a new route to prepare improved composites, meanwhile, composites with outstanding processability and excellent mechanical and thermal properties are expected to be widely applied in the fields of high‐performance structural materials. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45881.

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Effect of solid‐state stress induced reaction on morphology and structure of metallocene polyethylene

Cited by 2 publications

References 27 publications

Effect of solid‐state shear milling on structure and properties of HDPE/UHMWPE blends

Effect of solid‐state shear milling on structure and properties of HDPE/UHMWPE blends

Design of the phthalonitrile‐based composite laminates by improving the interfacial compatibility and their enhanced properties

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