Cage octasilsesquioxane-pendant polynorbornenes connected with short spacers exhibiting optical transparency

IF 2.3 4区 化学 Q3 POLYMER SCIENCE Polymer Journal Pub Date : 2024-03-06 DOI:10.1038/s41428-024-00903-y
Yu Tomioka, Ryota Tanaka, Thu Thao Pham, Shin-ichi Yusa, Hiroaki Imoto, Kensuke Naka
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Abstract

Heptaisobutyl-norbornenylethyl-substituted cage octasilsesquioxane (POSS) (1a) and heptaphenyl-norbornenylethyl-substituted POSS (1b) were subjected to ring-opening metathesis polymerizations (ROMP) at room temperature with the Grubbs 2nd generation catalyst. The metathesis polymerizations of 1a and 1b were performed at room temperature for 3 h with initial monomer molar concentrations of [1a, 1b] = 10 mM, and the number average molecular weights (Mn) of 2a and 2b were 82,000 g/mol and 87,000 g/mol, respectively. Dynamic light scattering (DLS) and static light scattering (SLS) measurements showed that the Rg/Rh value for 2a was 4.91, suggesting the formation of polydisperse rod-shaped particles. Chloroform solutions of 2a and 2b were cast onto glass substrates and dried at room temperature to obtain optically transparent free-standing films. X-ray diffraction (XRD) analyses of the casted films revealed their amorphous natures. Thermogravimetric analyses (TGA) of 2a and 2b under N2 atmospheres showed 5 wt% losses (Td5) at 416 °C and 451 °C, respectively. The POSS-pendant polynorbornenenes connected with short spacers exhibited showed high optical transparencies owing to the prevention of POSS crystallization and the excellent thermal stability. Side-chain typed POSS-based polynorbornenes connecting with a short spacer exhibiting optical transparency owing to prevention of POSS crystallization to provide amorphous character. In addition, the resulting amorphous polymers exhibited excellent thermal stability.

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用短间隔物连接的笼状八叠苯并二噁烷附聚降冰片烯具有光学透明性
使用 Grubbs 第二代催化剂在室温下对七异丁基-降冰片烯乙基取代的笼状八硅氧烷(POSS)(1a)和七苯基-降冰片烯乙基取代的 POSS(1b)进行开环元合成聚合反应(ROMP)。1a 和 1b 的开环聚合反应在室温下进行了 3 小时,初始单体摩尔浓度为 [1a, 1b] = 10 mM,2a 和 2b 的平均分子量(Mn)分别为 82,000 g/mol 和 87,000 g/mol。动态光散射(DLS)和静态光散射(SLS)测量显示,2a 的 Rg/Rh 值为 4.91,表明形成了多分散的棒状颗粒。将 2a 和 2b 的氯仿溶液浇铸到玻璃基底上,并在室温下干燥,得到光学透明的独立薄膜。对浇铸薄膜进行的 X 射线衍射(XRD)分析表明,它们具有无定形性质。在氮气环境下对 2a 和 2b 进行的热重分析(TGA)显示,在 416 ℃ 和 451 ℃ 时分别有 5 wt% 的损失(Td5)。由于防止了 POSS 结晶和优异的热稳定性,与短间隔相连的 POSS 附聚降冰片烯显示出很高的光学透射率。
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来源期刊
Polymer Journal
Polymer Journal 化学-高分子科学
CiteScore
5.60
自引率
7.10%
发文量
131
审稿时长
2.5 months
期刊介绍: Polymer Journal promotes research from all aspects of polymer science from anywhere in the world and aims to provide an integrated platform for scientific communication that assists the advancement of polymer science and related fields. The journal publishes Original Articles, Notes, Short Communications and Reviews. Subject areas and topics of particular interest within the journal''s scope include, but are not limited to, those listed below: Polymer synthesis and reactions Polymer structures Physical properties of polymers Polymer surface and interfaces Functional polymers Supramolecular polymers Self-assembled materials Biopolymers and bio-related polymer materials Polymer engineering.
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