A new cross-linking route via the unusual collision kinematics of hyperthermal protons in unsaturated hydrocarbons: the case of poly(trans-isoprene).
A new cross-linking route via the unusual collision kinematics of hyperthermal protons in unsaturated hydrocarbons: the case of poly(trans-isoprene).
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DOI：
10.1039/b605705e
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发表时间：
2006-07
影响因子：
4.9
通讯作者：
Zhi Zheng;W. M. Kwok;W. Lau
中科院分区：
文献类型：
--
作者：
Zhi Zheng;W. M. Kwok;W. Lau
用10 eV的质量分离的质子束轰击约18 nm的聚（反式异戊二烯）分子膜（每个分子约300，000个碳原子）已显示出每个入射质子诱导几个大分子的高效交联。在这种使用物理手段进行合成化学的新方法中，超高温质子优先裂解C-H键，因为它们在烃中的不寻常的运动学，并且由此产生的碳自由基引发异戊二烯C[双键，长度为m-dash]C键的聚合链反应。该方法通过用干法交联来生产聚合物膜，该干法具有高化学选择性和反应性，但不需要热成本和化学添加剂，这些条件通常在微电子和光子学的制造中需要。
The bombardment of a approximately 18 nm film of poly(trans-isoprene) molecules (approximately 300,000 carbon atoms per molecule) with a mass-separated proton beam at 10 eV has been shown to induce highly efficient cross-linking of several macromolecules per incident proton. In this new method using physical means to conduct synthetic chemistry, the hyperthermal protons preferentially cleave C-H bonds because of their unusual kinematics in hydrocarbons, and the carbon radicals thus created initiate a polymerization chain reaction of the isoprene C[double bond, length as m-dash]C bonds. The method produces ultrathin polymeric films via cross-linking with a dry process having high chemical selectivity and reactivity but requiring no thermal cost and no chemical additives, conditions that are commonly required in the fabrication of microelectronics and photonics.