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Park, Jungkook; Park, Yeong Hoon; Kim, Jinhan; Cha, Jong-Ho; Kim, Suin; Oh, Alice

doi:10.1145/3231644.3231657

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…Castor oil is obtained from seeds of Ricinus communis comprising mainly of recinoleic acid (12‐hydroxy‐ cis ‐9‐octadecenoic acid) in its triglyceride structure . Having inherent hydroxyl functionalities in its triglyceride structure castor oil can be easily utilized as polyols in the preparation of PUs without any modification to its original structure . It is also a nonedible and cost‐efficient plant oil, making it an ideal alternative to petroleum‐based polyols.…”

Section: Introductionmentioning

confidence: 99%

Castor oil‐based polyols with gradually increasing functionalities for biopolyurethane synthesis

Park

Lee

Kim

et al. 2019

J of Applied Polymer Sci

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In this research, castor oil‐based polyols with gradual increasing functionalities were prepared using thiol‐ene photo click reaction. The polyols were prepared by facile and efficient photo‐click reaction using thiols with different number of hydroxyl groups. The polyols were successfully synthesized using a modified bio‐oxygen demand (BOD) reactor and their structures were characterized. The hydroxyl number of the prepared polyols gradually increased depending on the thiol used for preparation. The increased hydroxyl number resulted in increased crosslinking densities for the prepared polyurethanes. The effect of the increasing crosslinking density and structure of the polyols on the mechanical and thermal properties of polyurethane were investigated. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48304.

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Section: Introductionmentioning

confidence: 99%

Castor oil‐based polyols with gradually increasing functionalities for biopolyurethane synthesis

Park

Lee

Kim

et al. 2019

J of Applied Polymer Sci

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“…The use of plant oils as raw materials offers the advantages of world wide availability and competitive low price. However, the mechanical and thermal properties of bio‐based PU are usually not as good as those of petroleum‐based PUs, and thus different additives or modifications have been considered …”

Section: Introductionmentioning

confidence: 99%

Waterborne polyurethane nanocomposites based on vegetable oil and microfibrillated cellulose

Hormaiztegui

Mucci

Santamaria‐Echart

et al. 2016

J of Applied Polymer Sci

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This work analyzes the differences in the final properties of two waterborne polyurethanes (WBPU) prepared with two macrodiols of different chemical structure, but similar molecular weight, as well as the variations caused by incorporating low percentages of microfibrillated cellulose nanocrystals. One of the polyurethanes was based on a synthetic but biodegradable precursor (polycaprolactone diol, PCL) and a second one based on a bio‐based macrodiol derived from castor oil (CO1). The bio‐based material presented higher mechanical properties at room temperature than the synthetic one, with the Young's modulus (MPa) ranging from 2.23 ± 0.09 to 84.88 ± 0.96 for the PCL and bio‐based WBPUs, respectively. Additionally, the PCL‐based WBPU showed to be more sensitive to the incorporation of cellulose than the bio‐based WBPU, and it also suffered changes during time due to delayed crystallization. The behavior of the two systems were compared and related to the different structure of the macrodiols that led to different interfacial interactions. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44207.

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Improving Engagement in Program Construction Examples for Learning Python Programming

Hosseini

Akhüseyinoğlu

Brusilovsky

et al. 2020

Int J Artif Intell Educ

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This research is focused on how to support students' acquisition of program construction skills through worked examples. Although examples have been consistently proven to be valuable for student's learning, the learning technology for computer science education lacks program construction examples with interactive elements that could engage students. The goal of this work is to investigate the value of the "engaging" features in programming examples. We introduce PCEX, an online tool developed to present program construction examples in an engaging fashion. We also present the results of a controlled study with a between-subject design that was conducted in a large introductory Python programming class to compare PCEX with non-interactive worked examples focused on program construction. The results of our study show the positive impact of interactive program construction examples on student's engagement, problem-solving performance, and learning.

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Elicast

Cited by 9 publications

References 27 publications

Castor oil‐based polyols with gradually increasing functionalities for biopolyurethane synthesis

Castor oil‐based polyols with gradually increasing functionalities for biopolyurethane synthesis

Waterborne polyurethane nanocomposites based on vegetable oil and microfibrillated cellulose

Improving Engagement in Program Construction Examples for Learning Python Programming

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