高分子链的支化，与另一种共聚物接枝，或共混支化聚合物和线性聚合物是增加其粘度的基本方法，以使其能够发泡。
Branching polymer chains, copolymerizing with another monomer, and blending branched or cross-linked polymers are the basic methods to increase its viscosity so that it can be suitable for foaming.
聚合物组合物显示出相对低水平的长链支化和相对高的分子量。
The polymer composition shows relatively low-level long chain branching and relatively high-level molecular weight.
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