Facile Synthesis of Amphiphilic Heterografted Copolymers with Crystalline and Amorphous Side Chains

Gao, Qing; Wang, Yanshai; Ren, Yingying; Li, Yang

doi:10.1002/macp.201300255

Cited by 10 publications

(7 citation statements)

References 62 publications

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“…The chemical shifts at d ¼ 2.7 and 2.9 were assigned to the cis-epoxy hydrogens and trans-epoxy hydrogens. The epoxidation degree (E) was calculated as following equation [38]:…”

Section: Characterization Of Epbmentioning

confidence: 99%

Highly toughened polylactide with epoxidized polybutadiene by in-situ reactive compatibilization

Wang

Wei

Leng

et al. 2016

Polymer

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a b s t r a c tRelatively high contents of rubber are commonly required to trigger the brittle-to-ductile transition when using rubber components to toughen polylactide (PLA). However, the strength may drop remarkably after incorporation of large amount of rubber. The main motivation of the present work is to achieve a good toughness-strength balance in a PLA/rubber system with less amount of rubber phase (90/10 w/w). In this study, polybutadiene (PB) was used to toughen PLA due to the flexible molecular chains. In attempt to enhance the compatibility of PB in PLA matrix, epoxidized polybutadiene (EPB) with different epoxidation degree were prepared by an in situ peroxy-formic acid method. The compatibility, phase morphologies, mechanical properties and thermal properties of the PLA/EPB blends were investigated respectively. It was found that epoxy group of EPB showed a significant effect in enhancing compatibility between rubber phase and PLA matrix, giving rise to a remarkable decrease in the particle diameter of rubber phase. When both of the good compatibility and the appropriate particle size of the rubber phase were realized, the impact toughness of PLA/EPB blend was improved by 13 times for that of pure PLA, while the tensile strength still preserved as a level of 77% (based on the value of pure PLA). The interfacial compatibilization between PLA and EPB was achieved through the formation of graftcopolymer being a compatibilizer caused by the in-situ reaction between EPB and PLA in the melt blend process. This result proves the introduction of active groups into PLA blends to be a platform to design their performance via regulating the phase structure.

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“…The chemical shifts at d ¼ 2.7 and 2.9 were assigned to the cis-epoxy hydrogens and trans-epoxy hydrogens. The epoxidation degree (E) was calculated as following equation [38]:…”

Section: Characterization Of Epbmentioning

confidence: 99%

Highly toughened polylactide with epoxidized polybutadiene by in-situ reactive compatibilization

Wang

Wei

Leng

et al. 2016

Polymer

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“…The 1 H NMR spectrum of the virgin SBC and the ESBC is shown in Figure . The increase in epoxidation degree was confirmed by the decrease in area of the olefinic peak at 5.4 ppm (cis‐ and trans‐1,4 units) and the increase areas of epoxy peaks at 2.9 and 2.7 ppm, assigned to cis‐ and trans‐1,4 epoxy protons, respectively . The epoxidation degree ( E ) was calculated as the following equation:

E = \frac{A_{δ = 2.7} + A_{δ = 2.9}}{A_{δ = 2.7} + A_{δ = 2.9} + A_{δ = 5.4} + A_{δ = 5.0} - \frac{1}{2} A_{δ = 5.0}} \times 100 %

…”

Section: Resultsmentioning

confidence: 99%

Toughening polylactide with epoxidized styrene–butadiene impact resin: Mechanical, morphological, and rheological characterization

Wang

Wei

2017

J of Applied Polymer Sci

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Styrene-butadiene impact resin (SBC) was chosen as the toughening agent to improve the tensile toughness of polylactide (PLA). Epoxidized SBC (ESBC) with different epoxidation degree were prepared by epoxidation using in situ peroxoformic acid method and a series of PLA/SBC(ESBC) blends were prepared by melt blending. The elongation at break of the PLA/ESBC blends was greatly improved, which was reflected in the slight decrease in the tensile strength and tensile modulus. Moreover, the tensile strength and tensile modulus were not significantly affected by the epoxidation degree of ESBC. For example, the incorporation of ESBC28.8% (30 wt %) to PLA caused an obvious increment of elongation at break from 3.5% of pure PLA to 305.0%, while the tensile modulus and tensile strength decreased to 80 and 78% of pure PLA, respectively. Scanning electron microscopy observations of cryo-fractured surface morphology and particle size analysis demonstrated that the compatibility of the PLA/ESBC blends was improved significantly compared to PLA/SBC blend. PLA/ESBC(70/30) blends exhibited shear-thinning behavior over the range of the studied shear rate. With an increase in shear rate, the non-Newtonian index of the blends decreased gradually. Furthermore, the flow behavior of PLA/ESBC(70/30) blends was more sensitive to the shear rate than pure PLA. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46058.

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“…Chemical shifts were expressed in ppm downfield from tetramethyl silane (TMS) as internal standard. The molecular structure of the polymer is presented in Appendix A indicating the protons corresponding to its double bonds: 1,2 (vinyl) and 1,4 (cis and trans) [17]. Table 3 shows all the characteristics of the PB used in this work.…”

Section: Methodsmentioning

confidence: 99%

Experimental pressure versus temperature isochoric – isoplethic curves for n-pentane – dimethyl ether, n-pentane – dimethyl ether – polybutadiene and n-pentane – dimethyl ether – polybutadiene– hydrogen at high pressures

Menossi

Milanesio

Ciolino

et al. 2020

The Journal of Supercritical Fluids

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Facile Synthesis of Amphiphilic Heterografted Copolymers with Crystalline and Amorphous Side Chains

Cited by 10 publications

References 62 publications

Highly toughened polylactide with epoxidized polybutadiene by in-situ reactive compatibilization

Highly toughened polylactide with epoxidized polybutadiene by in-situ reactive compatibilization

Toughening polylactide with epoxidized styrene–butadiene impact resin: Mechanical, morphological, and rheological characterization

Experimental pressure versus temperature isochoric – isoplethic curves for n-pentane – dimethyl ether, n-pentane – dimethyl ether – polybutadiene and n-pentane – dimethyl ether – polybutadiene– hydrogen at high pressures

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