Mechanical and flame retardant properties of polylactide composites with hyperbranched polymers

Cheng, Kuo‐Chung; Chang, Shun-Chih; Lin, Yan-Huei; Wang, Chun‐Chieh

doi:10.1016/j.compscitech.2015.09.001

Cited by 16 publications

(12 citation statements)

References 22 publications

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“…13,14 Hyperbranched polymers exhibit characteristics that are very different from those of linear polymers, for example, low viscosity, high solubility, and high density of the functional end-groups. 15 These particulate polymers provide various kinds of functional end groups, from hydrophilic to hydrophobic and from reactive to non-reactive. 16,17 The presence of numerous terminal groups is a typical characteristic of hyperbranched polymers.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of poly(ethylene terephthalate)/hyperbranched polymer nanocomposites by melt blending

2016

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In this paper, nanocomposites of polyethylene terephthalate (PET) including polyesteramide-based hyperbranched polymer, or PET/Hyperbranched polymer nanocomposites, have been prepared via melt blending method with different hyperbranched polymer contents. In addition, morphology, surface structure, and thermal properties of these nanocomposites and virgin PET were studied by atomic force microscopy, attenuated total reflection fourier transform infrared spectroscopy and differential scanning calorimetry (DSC), respectively. Dynamic mechanical analysis experiments in solid state were carried out to follow the effect of hyperbranched polymer on the dynamic mechanical properties of these nanocomposites. The structure of the nanostructured hyperbranched polymer was also studied by small-angle X-ray scattering. The rheometric mechanical spectroscopy results showed that the hyperbranched polymer as a modifier decreased the complex viscosity and enhanced liquid-like behavior. This happened more significantly by increasing the content of hyperbranched polymer. The DSC analysis results revealed that crystallinity and glass transition temperature decreased by adding the amount of hyperbranched polymer.

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of poly(ethylene terephthalate)/hyperbranched polymer nanocomposites by melt blending

2016

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“…As shown in Figure , the DSC thermogram exhibits a glass transition temperature ( T g ) at 58°C for pure PLA. The peak temperature of cold crystallization was approximately 119°C, and 2 melting peaks appeared at 152°C and 158°C, resulting from either a crystal transition from the α′ to α‐form during heating or a lamellar reorganization . The T g of the hyperbranched silicon‐containing polymer HBP‐B2 was approximately −42°C, as estimated by the half height of the wide‐ranging transition, and the melting peak was located at 27°C, which may be attributed to the presence of long aliphatic chains from alkyl glycidyl ethers of the HBP.…”

Section: Resultsmentioning

confidence: 97%

“…The peak temperature of cold crystallization was approximately 119°C, and 2 melting peaks appeared at 152°C and 158°C, resulting from either a crystal transition from the α′ to α-form during heating or a lamellar reorganization. 19 The T g of the hyperbranched silicon-containing polymer HBP-B2 was approximately −42°C, as estimated by the half height of the wide-ranging transition, and the melting peak was located at 27°C, which may be 160°C at a rate of 5°C/min. Figures 8 and 9 show the dependence of storage and loss modulus profiles, G′ and G″, respectively, on the temperature.…”

Section: Thermal Properties Of Pla/ath Composites With Hyperbranchementioning

confidence: 97%

“…In contrast, multifunctional monomers are more readily available. Hyperbranched polymers can also be prepared by stepwise polymerization of a mixture of bifunctional A‐type monomers, A 2 , and g‐functional B‐type monomers, B g (g > 2), with the addition of the monofunctional compound to avoid gelation . A series of HBPs with a variety of molecular structures have been synthesized via bulk polymerization of a diepoxide with a primary amine in the presence of a monoepoxide.…”

Section: Introductionmentioning

confidence: 99%

“…Hyperbranched polymers can also be prepared by stepwise polymerization of a mixture of bifunctional A-type monomers, A 2 , and g-functional B-type monomers, B g (g > 2), with the addition of the monofunctional compound to avoid gelation. 19 A series of HBPs with a variety of molecular structures have been synthesized via bulk polymerization of a diepoxide with a primary amine in the presence of a monoepoxide. Among these, the HBP containing siloxane, PEG, and aliphatic chains, referred to as HBP-B2, can be melt-blended with PLA to improve its impact strength.…”

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confidence: 99%

See 2 more Smart Citations

Mechanical and flame‐retardant properties of biodegradable polylactide composites with hyperbranched silicon‐containing polymer

Cheng

Wang

Ruan

et al. 2018

Polymers for Advanced Techs

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A hyperbranched polymer (HBP‐B2) containing siloxane chains was synthesized via bulk polymerization of diepoxide with a primary amine in the presence of monoepoxide. The weight‐average molecular weight of the prepared polymers was approximately 9200. Composites of polylactide (PLA) with aluminum trihydroxide (ATH) and the HBP‐B2 were prepared via direct melt compounding using a brabender. The test results showed that the LOI could be raised to 34% for the PLA composite with 25 wt% ATH and 5% HBP‐B2. The surface thermal profile of the composite during UL94 V test was further captured by an infrared camera, which was helpful to understand the flame‐retardant properties of the different samples. A V‐0 rating could be achieved by adding ATH and HBP‐B2 to the PLA matrix. Incorporation of HBP‐B2 as a plasticizer could increase the impact strength of a PLA blend or composite. For example, an addition of 10 wt% of HBP and 20 wt% ATH increased the elongation at break from 5% for neat PLA to 155% for the PLA composite.

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Flame retardant and mechanical properties of epoxy composites with ammonium polyphosphate and hyperbranched silicon‐containing polymers

Cheng

Kuo

2019

J of Applied Polymer Sci

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The epoxy resin was mixed with ammonium polyphosphate (APP) and hyperbranched silicon-containing polymers (HBP-B2). The cured composites were investigated by thermogravimetric analysis, Underwriters Laboratory standard for the flammability properties under vertical burning (UL-94V), and limited oxygen index (LOI) test methods. The LOI of 43.5 and could be obtained at the weight ratio of 70:25:5 for the epoxy resin:APP:HBP-B2, Sample A25B5, and the LOI was higher than that of the composite with 30 wt % APP only, Sample A30B0, of which the LOI was 34.5. It suggested that the HBP-B2 could cooperate with the epoxy/APP composite to form a more effective protection layer during combustion, which resulted in a higher second-stage thermal degradation temperature. During the UL-94V test, the flame was extinguished immediately once the burner was removed. Furthermore, the tensile and impact strength of the epoxy/APP composite could also be improved by using HBP-B2 compound as the toughening agent. The composite containing 20% of APP and 10% of HBP-B2, Sample A20B10, still had excellent flame retardant properties with a V-0 rating. Moreover, the tensile strength and impact strength of that composite got 19 and 25% increases compared with the Sample A30B0, which contained 30% of APP only.

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Mechanical and flame retardant properties of polylactide composites with hyperbranched polymers

Cited by 16 publications

References 22 publications

Preparation and characterization of poly(ethylene terephthalate)/hyperbranched polymer nanocomposites by melt blending

Preparation and characterization of poly(ethylene terephthalate)/hyperbranched polymer nanocomposites by melt blending

Mechanical and flame‐retardant properties of biodegradable polylactide composites with hyperbranched silicon‐containing polymer

Flame retardant and mechanical properties of epoxy composites with ammonium polyphosphate and hyperbranched silicon‐containing polymers

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