Compared with short-chain-length-PHAs (scl-PHAs), such as polyhydroxybutyrate (PHB), medium-chain-length-PHAs (mcl-PHAs) copolymers are less crystalline, and are more flexible polymers with low melting points, and generally regarded as elastomers.

• 中长链羟基脂肪酸聚酯(medium-chain-length-PHAs，mcl-PHAs)是几种中长链的羟基脂肪酸结构单体的共聚物，比短链羟基脂肪酸聚酯(short-chain-length-PHAs，scl-PHAs)具有更好的物理、机械特性。