Browsing by Author "Huang, Shu-Chen"

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Assessing motivation and learning strategies using the Motivated Strategies for Learning Questionnaire in a foreign language learning context
(2008)
Huang, Shu-Chen
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交大名義發表
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National Chiao Tung University
This study pinpointed the lack of, and necessity for, using standardized questionnaires for the study of learner motivation in the foreign language (L2) learning context. To compare the similarities and differences in general education and L2 learning, the researcher chose the Motivated Strategies for Learning Questionnaire (MSLQ; Pintrich, Smith, Garcia, & McKeachie, 1991) and investigated the scale's reliability and its correlation with L2 achievement. Results suggested that, in spite of some inherent uniqueness, L2 learning is similar to other subjects in the school environment and the MSLQ has the potential to he applied to L2-related studies.
Novel Siloxane-Modified Epoxy Resins as Promising Encapsulant for LEDs
(2020-01-01)
Lin, Chih-Hao
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Whang, Wha-Tzong
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Chen, Chun-Hua
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Huang, Shu-Chen
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Chen, Kai-Chi
This study investigated a new category of transparent encapsulant materials for light-emitting diodes (LEDs). It comprised a phenyl group that contained siloxane-modified epoxy (SEP-Ph) hybridized with a cyclic tetrafunctional siloxane-modified epoxy (SEP-D4) with methylhexahydrophthalic anhydride (MHHPA) as a curing agent. The SEP-Ph/SEP-D4 = 0.5/0.5 (sample 3) and SEP-D4 (sample 4) could provide notably high optical transmittance (over 90% in the visible region), high-temperature discoloration resistance, low stress, and more crucially, noteworthy sulfurization resistance. The lumen flux retention of the SEP encapsulated surface mounted device LEDs remained between approximately 97% and 99% after a sulfurization test for 240 h. The obtained comprehensive optical, mechanical, and sulfurization resistance proved the validity and uniqueness of the present design concept with complementary physical and chemical characteristics.
Synthesis and performance enhancement of novel polybenzoxazines with low surface free energy
(2011-07-01)
Chen, Kai-Chi
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Li, Hsun-Tien
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Huang, Shu-Chen
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Chen, Wen-Bin
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Sun, Kien-Wen
A new siloxane-imide-containing benzoxazine, BZ-A6, has been successfully synthesized. The thermal properties of the polybenzoxazine (PBZ) prepared from BZ-A6 (PBZ-A6) are superior to those of conventional PBZs lacking siloxane groups. The normally brittle PBZs are toughened significantly as a result of adding siloxane-imide moieties. Moreover, the thermal and UV stabilities of the surface free energy of PBZ-A6 are dramatically improved over the conventional bisphenol-A-type PBZ. Siloxane-imide PBZs are more suitable for application as low-surface-free-energy materials that are highly resistant to temperature and UV radiation. PBZ-A6 may also be useful in weather-resistant and self-cleaning coating materials because of its low surface free energy and good thermal and UV resistance. (C) 2011 Society of Chemical Industry