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Synthesis and Characterization of Bio-based Epoxy Blends from Renewable Resource Based Epoxidized Soybean Oil as Reactive Diluent

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Chinese Journal of Polymer Science 2015年第1期33卷 137-152页

作者： sushanta k sahoo Smita Mohanty Sanjay k Nayak Laboratory for Advanced Research in Polymeric Materials (LARPM) Central Institute of Plastics Engineering & Technology (CIPET)B/25 CNI complex Patia Bhubaneswar 751024 Odisha India

A novel bioresin, epoxidized soybean oil was synthesized by in situ method and was characterized employing FTIR and NMR. The bioresin was blended with epoxy（DGEBA） at different ratios as reactive diluents for improved processibility and toughened nature. The composition with 20 wt% bioresin exhibited improved impact strength to the tune of 60% as compared to virgin epoxy. Fracture toughness parameters critical stress intensity factor（kIC） and critical strain energy release rate（GIC） were evaluated using single edge notch bending test and demonstrated superior enhancement in toughness. Dynamic mechanical, thermal, thermo mechanical and fracture morphological analyses have been studied for bio-based epoxy blends. Curing kinetics has been evaluated through DSC analysis to investigate the effect of bioresin on cross-linking reaction of neat epoxy with triethylenetetramine as curing agent.

关键词： Bio-based epoxy Soybean oil Fracture toughness Curing kinetics TMA.

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Assessment of Genetic Diversity of Drought Tolerant and Susceptible Rice Genotypes Using Microsatellite Markers

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Rice science 2019年第4期26卷 239-247,I0005,I0010-I0014页

作者： Ravindra DONDE Jitendra kUMAR Gayatri GOUDA Manoj kumar GUPTA Mitadru MUkHERJEE Sk Yasin BAkSH Pradosh MAHADANI khirod kumar sahoo Lambodar BEHERA sushanta kumar DASH Crop Improvement Division Indian Council of Agricultural Research-National Rice Research Institute/Formerly-Central Rice Research Institute Cuttack Pin-753006.OdishaIndia Ravenshaw University Department of Biotechnology Cuttack Pin-753003Odisha India Department of Biotechnology & Bioinformatics Yogi Vemana University KadapaPin-516003 OdishaIndia

The introgression of wild chromosomal segments into popular rice varieties is one of the potential approaches for developing varieties for drought stress condition. Sixteen genotypes, including nine indica, two tropical japonica and five chromosome segments substitution lines (CSSLs) with different levels of tolerance/susceptibility to drought stress, were selected for diversity study. Sixty-three microsatellite markers were utilized for assessing genetic diversity. A total of 95 alleles were amplified, and out of them, 60 were polymorphic. Six unique alleles, amplified by the microsatellite loci RM276, RM472, RM488, RM537, RM541 and RM28089, were identified in six genotypes, namely FR13A, Brahamanakhi, RUF44, Swarna-sub1, Brahamanakhi and Satyabhama. The highest genetic similarity was found among CSSLs. Polymorphism information content (PIC) value varied from 0 to 1.00 with an average of 0.66 per locus. Twenty-eight microsatellites were found to be polymorphic, which could be used in marker-assisted selection programme. All the sixteen genotypes were grouped into two major clusters at genetic similarity of 0.64. In the cluster I, five CSSLs identified as diverse genotypes had wild ancestor segments responsible for drought tolerance, and hence they could be utilized as potential donors. The popular Indian varieties, Swarna-sub1 and IR64-sub1, could be used as recurrent parents in the future breeding program for developing varieties for abiotic stresses such as submergence and drought.

关键词： genetic diversity marker-assisted selection microsatellite marker rice drought stress submergence chromosome segment substitution line

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