Unfortunately, the polyurethane foam he used is inherently unstable.

不幸的是，他使用的聚氨酯泡沫天生不稳定。

It's not that easy to recycle polyurethane.

收聚氨酯并不容易。

Some other polymers like polyurethane or Bakelite are thermoset.

其他一些聚物如聚氨酯或电木是热固性的。

For starters, the heel, insole, midsole, and upper layer are usually made from synthetic textiles like polyester, nylon, latex, and polyurethane.

首先，鞋跟、鞋垫、鞋底夹层和鞋面通常由成纺织品制成，像聚酯、尼龙、乳胶和聚氨酯。

Unfortunately, due to its widespread use, more than a million tons of polyurethane waste end up in U.S. landfills each year.

不幸的是，由于聚氨酯的广泛使用，每有超过100万吨的聚氨酯废最终被丢弃在美国垃圾填埋场。

Designed by Shift Robotics, an offshoot of Carnegie Mellon University, Moonwalkers consist of a 300W brushless motor in each 4.2-lb (1.9-kg) shoe that powers eight polyurethane wheels.

“月球漫步者”由美国卡耐基梅隆大学下属的Shift Robotics公司设计，每双重量为1。9千克的鞋中包含一个300瓦的无刷电机，为8个聚氨酯子提供动力。

Someone says a suit of plastic wheels is polyurethane, but when roller man's out for a spin he might look comical but knows how to book it.

有人说这套子是聚氨酯做的，当滑达人出去转圈兜风时，可能看起来很滑稽，但他知道怎么定制这套子。

He and his team therefore set out to tweak the molecules that make up polyurethane to make it easier for it to be converted into other useful materials.

因此，他和他的团队着手调整构成聚氨酯的分子，使其更容易转化为其他有用的材。

Polyurethane binders are combined with gravel or stones to create a surface with similar properties to concrete or tar, but with tiny cavities that let water through.

聚氨酯粘剂与砾石或石头结在一起，形成一种与混凝土或焦油具有相似特性的表面，但具有让水通过的微小空腔。

It is made from a blend of crushed rock, rubber and polyurethane, a synthetic plastic that replaces bitumen as the binding agent and allows even bigger pores in the road surface.

它由碎石、橡胶和聚氨酯制成，人造胶聚氨酯可以代替沥青，因为这种粘剂可以允许更大的气孔存在于路面。

In the particular process recently presented by Zimmerman's grad student Ephraim Morado at the national meeting of the American Chemical Society in San Diego, the new polyurethanes behave like superglue.

在齐默尔曼的研究生Ephraim Morado最近在圣地亚哥举行的美国化学学会全国会议上提出的特定过程中， 新聚氨酯的行为就像强力胶一样。

Now most of these farms are hydroponic or aeroponic systems, which means that instead of using soil, they use a substitute material like polyurethane sponges, biodegradable peat moss and even use inorganic materials like perlite and clay pellets.

现在这些农场大多是水培或气培系统，这意味着他们不使用土壤，而是使用聚氨酯海绵、可生物降解的泥炭藓等替代材，甚至使用珍珠岩和粘土颗粒等无机材。