The data show that the trimethylolpropane trimethacrylate(TMPTA) polymer foams have small density variations: the density is greater at the outer edges than that of the interior of foam.

• 研究结果表明：泡沫柱沿轴向的密度分布比较均匀，而沿径向呈内低外高分布，形成了明显的密度梯度。