Both of these lobes together constitute a pi bond.
上下两片叶一起组成了一根 π键。
So we can kind of flip it this way this will be one pi bond, this will be another interacting between these p orbitals.
我们可以把它这样翻一下,这是一个π键，这是另外一个p轨道之间,相互作用的π键。
So it already should make sense why we have that p orbital there, in order to form a pi bond, we're going to need a p orbital.
这里有p轨道是很合理的,为什么我们在这里有P轨道，为了形成一个π键，我们需要一个p轨道。
We're already using it up in this pi bond here, so that means we're limited to only two other spots on the molecule, so we have three.
我们已经把它用到这个π键里去了，所以这意味着,我们在分子里只剩下两个位置，所以一共是三个。
So PI bonds have electron density both above and below the bond axis, but they actually have a nodal plane at this z, this bond axis here.
键在键轴之上，和之下都有电子密度，但它们在z方向有节面，这是键轴的地方。
So, as they're very quietly handing out your class notes, let's think about what this bond is here, this boxed bond, is it a pi bond or a sigma bond?
在他们发讲义的同时，我们来看看这个键，方框里的这个键，它是sigma键还是π键？
Pi orbitals are a molecular orbital that have a nodal plane through the bond axis.
轨道是沿着键轴,有节面的分子轨道。
Poly (ether imide) (PEI) is a modification kind of high performance polymer, which adds a ether bond to macromolecular chain of polyimide (PI).
聚醚酰亚胺(PEI)是在聚酰亚胺(PI)链上引入醚键形成的一类高聚物。
Poly (ether imide) (PEI) is a modification kind of high performance polymer, which adds a ether bond to macromolecular chain of polyimide (PI).
聚醚酰亚胺(PEI)是在聚酰亚胺链上引入醚键而形成的一类高聚物。
Poly (ether imide) (PEI) is a modification kind of high performance polymer, which adds a ether bond to macromolecular chain of polyimide (PI).
聚醚酰亚胺(PEI)是在聚酰亚胺链上引入醚键而形成的一类高聚物。
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