Study on degrees of mesomorphic zone of polymer.Ⅰ.Determination of degrees of crystallinity of Eucommia ulmoides gum and natural rubber by dynamic mechanical thermal analysis

Zhang, Jichuan; Zhang, Tianxin; Dong, Mengjie; Liu, Genshi; Dong, Yiyang

doi:10.1016/j.polymertesting.2017.09.018

Cited by 21 publications

(10 citation statements)

References 35 publications

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“…158,159 It was reported that, as the heating temperature increased from −25 to 150 °C, the crystallinity of EUR decreased from 87.34% to 17.47%. 158 When the cross-linking density increased from 0 to 61.34 × 10 −5 mol/cm 3 , the crystallinity of EUR determined by DSC and DMTA decreased from 33.97% to 0% and 87.34% to 30.21%, respectively. When the rate of cooling increased from 3 to 10 °C/min, the crystallinity of EUR decreased from 87.34% to 30.21%.…”

Section: Properties Ofmentioning

confidence: 99%

“…In 1931, Stillwell et al proposed the hypothesis that EUR had two crystal structures of α- and β-form . Thereafter, X-ray diffraction and dynamic mechanical thermal analysis (DMTA) were used to determine the crystal structure and properties, such as α- and β-form crystals, crystal cell parameters, and crystal conditions. − At room temperature, EUR is composed of α- and β-form crystal structures with high crystallinity (35%–42%). ,− As shown in Figure c, the six characteristic peaks at 11.5°, 18.2°,19.6°, 22.3°, 22.9°, and 27.0° are attributed to α- and β-form crystal structures, in which the two strong peaks at 19.6° and 22.9° are assigned to the β-crystal form . Cui et al .…”

Section: Properties Of Eucommia Ulmoides Rubbermentioning

confidence: 99%

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Natural Polymer Eucommia Ulmoides Rubber: A Novel Material

Wei

Peng

et al. 2021

J. Agric. Food Chem.

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As the second natural rubber resource, Eucommia ulmoides rubber (EUR) from Eucommia ulmoides Oliver is mainly composed of trans-1,4-polyisoprene, which is the isomer of natural rubber cis-1,4-polyisoprene from Hevea brasiliensis. In the past few years, the great potential application of EUR has received increasing attention, and there is a growing awareness that the natural polymer EUR could become an emerging research topic in field of the novel materials due to its unique and excellent duality of both rubber and plastic. To gain insight into its further development, in this review, the extraction, structure, physicochemical properties, and modification of EUR are discussed in detail. More emphasis on the potential applications in the fields of the environment, agriculture, engineering, and biomedical engineering is summarized. Finally, some insights into the challenges and perspectives of EUR are also suggested.

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Section: Properties Ofmentioning

confidence: 99%

Section: Properties Of Eucommia Ulmoides Rubbermentioning

confidence: 99%

Natural Polymer Eucommia Ulmoides Rubber: A Novel Material

Wei

Peng

et al. 2021

J. Agric. Food Chem.

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“…where M 1 and M 2 was the weights of the sample before and after immersion, respectively. The cross-link density (ν e ) is calculated by the Flory-Rehner Equation: [29,30]…”

Section: Cross-link Densitymentioning

confidence: 99%

Thermal and electrical dual‐triggered shape memory Eucommia ulmoides gum derived from renewable resources

Luo

et al. 2021

Polymer Composites

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Thermal and electrical dual-triggered shape memory composites were prepared by introducing multi-walled carbon nanotubes (CNTs) into the Eucommia ulmoides gum (EUG) matrix. The morphology of the composites was investigated by scanning electron microscope, and the CNTs exhibited good dispersion in the EUG matrix. The well-dispersed CNTs built a conductive network in the EUG matrix, generating electric current induced heat. The composites showed the shape memory effect upon stimulation by heat and electricity. The composites exhibited increased shape recovery speed with the increase in CNTs content and applied voltage. Furthermore, the composites recovered to 90% of their initial length within 36 V (AC), which is safe for humans. This work provides a feasible material with dual-triggered shape memory characteristics, which can find potential applications in medicine devices.

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“…Moreover, in recent research of natural rubber, crystallization has attracted a considerable attention worldwide from both academic and industrial points of view due to its significant role in many mechanical performances and in some practical applications such as sealing [22][23][24][25][26]. According to the previous investigations, crystallization behavior of natural rubber is principally influenced by the fundamental chain structure or the component factors such as high cis-1, 4 isoprene unit content [27,28], branching structure [24], crosslinking [25], gel or 3D network [29], long-chain fatty acid ester content [30], and so on.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Lamellae Phase of Raw Natural Rubber via Spontaneous Coagulation Assisted by Sugars

et al. 2021

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Natural rubber (NR) as a renewable biopolymer is often produced by acid coagulation of fresh natural latex collected from Hevea brasiliensis. However, this traditional process is facing a huge economic and environmental challenge. Compared with the acid coagulation, spontaneous or microorganism coagulation is an ecofriendly way to obtain NR with excellent performance. To clarify the influence of different sugars on NR quality, several sugars were used to assist the coagulation process. Influence of different sugars on microstructure and cold crystallization were examined by 1H NMR, DSC, etc. The results indicated that sugars exhibit different biological activity on terminal components of fresh field latex and can influence the resultant molecular structure and basic properties. Brown sugar exhibits higher metabolic activity and is inclined to decompose the protein and phospholipids crosslinking compared with other sugars. The larger molecular weight of sugar molecule is beneficial for the formation of the stable α lamellae phase and higher overall degree of crystallization.

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Study on degrees of mesomorphic zone of polymer.Ⅰ.Determination of degrees of crystallinity of Eucommia ulmoides gum and natural rubber by dynamic mechanical thermal analysis

Cited by 21 publications

References 35 publications

Natural Polymer Eucommia Ulmoides Rubber: A Novel Material

Natural Polymer Eucommia Ulmoides Rubber: A Novel Material

Thermal and electrical dual‐triggered shape memory Eucommia ulmoides gum derived from renewable resources

Microstructure and Lamellae Phase of Raw Natural Rubber via Spontaneous Coagulation Assisted by Sugars

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