New Biobased Surface Treatment to Improve Strength and Durability of<i>Bombax ceiba</i>

Saha, Prosenjit; Chowdhury, Sukanya; Manna, Suvendu; Roy, Debasis; Adhikari, Basudam; Thomas, Sabu

doi:10.1021/acssuschemeng.5b01057

Cited by 8 publications

(5 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has 10 esterified galloyl groups linked to a glucose core. Theoretically, it contains 25 phenolic hydroxyl groups, which could serve as reactive sites and be exploited for the functionalization of TA through various reactions [ 26 , 27 , 28 ]. In this work, TA was modified by a pyridine-catalyzed esterification with a common epoxy hardener MeHHPA, generating terminal carboxyl groups.…”

Section: Resultsmentioning

confidence: 99%

Tannic Acid as a Bio-Based Modifier of Epoxy/Anhydride Thermosets

et al. 2016

View full text Add to dashboard Cite

Abstract:Toughening an epoxy resin by bio-based modifiers without trade-offs in its modulus, mechanical strength, and other properties is still a big challenge. This paper presents an approach to modify epoxy resin with tannic acid (TA) as a bio-based feedstock. Carboxylic acid-modified tannic acid (TA-COOH) was first prepared through a simple esterification between TA and methylhexahydrophthalic anhydride, and then used as a modifier for the epoxy/anhydride curing system. Owing to the chemical modification, TA-COOH could easily disperse in epoxy resin and showed adequate interface interaction between TA-COOH and epoxy matrix, in avoid of phase separation. The use of TA-COOH in different proportions as modifier of epoxy/anhydride thermosets was studied. The results showed that TA-COOH could significantly improve the toughness with a great increase in impact strength under a low loading amount. Moreover, the addition of TA-COOH also simultaneously improved the tensile strength, elongation at break and glass transition temperature. The toughening and reinforcing mechanism was studied by scanning electron microscopy (SEM), dynamic mechanical analysis (DMA) and thermal mechanical analysis (TMA), which should be owned to the synergistic effect of good interface interaction, aromatic structure, decreasing of cross linking density and increasing of free volume. This approach allows us to utilize the renewable tannic acid as an effective modifier for epoxy resin with good mechanical and thermal properties.

show abstract

Section: Resultsmentioning

confidence: 99%

Tannic Acid as a Bio-Based Modifier of Epoxy/Anhydride Thermosets

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Recently, it has been proven that the incorporation of hyperbranched aromatic polyester toughener into epoxy resin may improve the toughness of epoxy resin by a phase-separated or nonphase-separated mechanism, meanwhile minimizing the deterioration of the T g and strength. − In this context, TA seems to be an attractive candidate for effective epoxy toughener. We had tried to add TA into epoxy formula without any modification.…”

Section: Introductionmentioning

confidence: 99%

Efficient Toughening of Epoxy–Anhydride Thermosets with a Biobased Tannic Acid Derivative

Fei

Wei

Zhao

et al. 2016

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Research into toughening an epoxy resin using biobased modifiers without trade-offs in its modulus, mechanical strength, and other properties still remains a challenge. In this article, an approach to toughen epoxy resin with tannic acid, a common polyphenolic compound extracted from plants and microorganisms, is presented. First, dodecane functionalized tannic acid (TA-DD) is prepared and subsequently incorporated into epoxy/anhydride curing system. Owing to the modification of long aliphatic chain, TA-DD can induce epoxy matrix yielding phase separation, forming microscaled separated phases. In the meantime, the terminal hydroxyl groups of TA-DD can participate in the curing process, which offers a good interfacial interaction between TA-DD and epoxy matrix. With such a mechanism, the results show that TA-DD can significantly toughen the epoxy resin without trade-offs in its strength, modulus, and T g . The thermoset with only 0.5 wt % TA-DD reaches highest impact strength, which is 196% increase of that of neat epoxy. This article opens up the possibility of utilizing the renewable tannic acid as an effective modifier for epoxy resin with good mechanical and thermal properties.

show abstract

“…In B. ceiba, the low genetic diversity and considerable SGS may be an outcome of the genetic bottlenecks (Supplementary Figure 1) caused by human interferences. B. ceiba is widely used in engineering, construction, and composite manufacturing, as it is easily available in form of a fast-growing plant species (Saha et al, 2016). A large number of B. ceiba trees were cut down for economic development and fruits were collected by local people for silk making to make cloth at the beginning of the twentieth century (Zhang and Zhang, 2018), resulting in significant population decline and low level of population regeneration (Zhao et al, 2016;Hassan, 2018).…”

Section: Obligate Xenogamy and Lower Genetic Diversitymentioning

confidence: 99%

Limited-Distance Pollen Dispersal and Low Paternal Diversity in a Bird-Pollinated Self-Incompatible Tree

et al. 2022

View full text Add to dashboard Cite

Bird pollination in Asia is regarded as an uncommon phenomenon and, therefore, only a few investigations on mating pattern and paternity in fruits of Asian bird-pollinated plants have been conducted. Here, we examined spatial genetic structure, pollen dispersal, and multiple paternity in a natural population of Bombax ceiba (B. ceiba) (Malvaceae) in Hainan Island, South China, using simple sequence repeat (SSR) markers. A low genetic diversity (He = 0.351 ± 0.0341 and 0.389 ± 0.043, respectively, for adults and offspring) and bottleneck effects were observed. Genetic kinship was significant within 400 m or in 1,800–3,800 m. Both the mating pattern and paternity analysis confirmed obligate xenogamy and a low multiple paternity in B. ceiba. There was a strongly negative relationship between the frequency of matings and the distance between mating pairs. The average pollen dispersal distance was 202.89 ± 41.01 m (mean ± SE) and the farthest distance of > 1 km was recorded. Realized mating events showed an extremely leptokurtic distribution within 1,200 m, suggesting that the pollen dispersal distance was consistent with the optimal foraging theory of generalist birds such as Zosterops spp. and Pycnonotus spp. Paternity per tree ranged from two to six and the average effective number of pollen donors per maternal plant was 3.773, suggesting a low level of paternity diversity as compared to other bird-pollinated plants. We concluded that optimal foraging behavior by generalist birds could explain the leptokurtic pollen dispersal distribution and predominantly near-neighbor matings in B. ceiba. The limited pollen dispersal distance and low multiple paternity were consistent with low fruit setting rate (3.27 ± 0.93%) in this self-incompatible tree, which was caused mainly by the restricted flight distance of birds and human disturbances. Low genetic diversity and significant spatial genetic structure might have largely resulted from logging and human collection of fruits.

show abstract

New Biobased Surface Treatment to Improve Strength and Durability ofBombax ceiba

Cited by 8 publications

References 43 publications

Tannic Acid as a Bio-Based Modifier of Epoxy/Anhydride Thermosets

Tannic Acid as a Bio-Based Modifier of Epoxy/Anhydride Thermosets

Efficient Toughening of Epoxy–Anhydride Thermosets with a Biobased Tannic Acid Derivative

Limited-Distance Pollen Dispersal and Low Paternal Diversity in a Bird-Pollinated Self-Incompatible Tree

Contact Info

Product

Resources

About