A novel post-polymerizable polynorbornene prepared via ROMP: easy synthesis and conversion into a free-standing film with high Tg and low dielectric constant,Materials Chemistry Frontiers

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A novel post-polymerizable polynorbornene prepared via ROMP: easy synthesis and conversion into a free-standing film with high Tg and low dielectric constant
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-05-28 00:00:00 , DOI: 10.1039/c8qm00201k
Jiajia Wang _{1,

2,

3,

4,

5} , Junfeng Zhou _{1,

2,

3,

4,

5} , Linxuan Fang _{1,

2,

3,

4,

5} , Jing Sun _{1,

2,

3,

4,

5} , Qiang Fang _{1,

2,

3,

4,

5}

Affiliation

A novel linear silicon-containing polynorbornene (BCB-PNB, M_n = 93 000 g mol⁻¹) with thermo-crosslinkable benzocyclobutene side chains was synthesized through ring-opening metathesis polymerization (ROMP). This polymer displayed good solubility and film-forming ability. After post-polymerization at high temperature, a free-standing film based on BCB-PNB was easily converted to a crosslinked network, which exhibited a dielectric constant of 2.60 for frequencies ranging from 40 Hz to 30 MHz. In particular, this crosslinked film exhibited a high T_g of up to 400 °C, which was much higher than that of the previously reported polynorbornenes prepared by ROMP. This is the first example of a polynorbornene prepared by ROMP with such a high T_g and good processability. Besides, the crosslinked film also displayed high hydrophobicity. These results indicate that the introduction of thermo-crosslinkable benzocyclobutene groups into polynorbornene side chains can greatly enhance the properties of the polymers. This work also develops a facile method for the preparation of a new free-standing post-polymerizable polynorbornene film.

中文翻译：

通过ROMP 制备的新型可后聚合的聚降冰片烯：易于合成并转化为具有高T _g和低介电常数的自支撑膜

通过开环复分解聚合（ROMP）合成了一种具有线性热交联苯并环丁烯侧链的线性含硅聚降冰片烯（BCB-PNB，M _n = 93000 g mol ^-1）。该聚合物显示出良好的溶解性和成膜能力。高温后聚合后，基于BCB-PNB的自支撑薄膜很容易转变为交联网络，对于40 Hz至30 MHz的频率，其表现出的介电常数为2.60。特别是，该交联膜显示出高的T _g。最高可达400°C，远远高于先前报道的ROMP制备的聚降冰片烯。这是通过ROMP制备的聚降冰片烯的第一个实例，其具有如此高的T _g和良好的可加工性。此外，交联膜还显示出高疏水性。这些结果表明，将可热交联的苯并环丁烯基团引入聚降冰片烯侧链中可以极大地增强聚合物的性能。这项工作还开发了一种简便的方法，用于制备新的自立式可后聚合的聚降冰片烯薄膜。

更新日期：2018-05-28

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