聚乳酸的静态双向拉伸性能

Static biaxially oriented property of PLA

以国产聚乳酸(PLA)和进口PLA为原料,研究其成膜加工性能以及静态拉伸工艺对薄膜性能的影响,并研究了扩链剂苯乙烯-丙烯酸甘油酯共聚物(ADR)、聚碳酸丁二酯(PBC)以及防粘连剂对PLA成膜性和力学性能的影响。结果表明:在拉伸速度为60 mm/s时,易得到综合性能较好的薄膜;w(ADR)为0.2%时,可有效改善PLA薄膜的厚薄均匀性,并可提高薄膜的纵、横向拉伸强度;w(PBC)为10%时,可明显改善其成膜性,膜的厚薄均匀性及脆性;防粘连剂的加入对成膜性及薄膜性能影响不大。

The film forming ability and static stretching process of imported and domestic poly(lactic acid)(PLA)were studied in this paper. The impact of chain extender that include poly(butylene carbonate)(PBC)and styrene-acrylic glyceride(ADR)and anti-blocking agent on the forming and mechanical properties of PLAwere observed as well. The results indicate that the properties of the film are the best when the oriented speed forPLA is 60 mm/s. The thickness uniformity of PLA is improved by adding chain extender ADR of 0.2% in mass fraction along with the lateral and vertical tensile strength of the film. 10% of PBC in mass fraction can enhance the film reforming ability of the film significantly as well as thickness uniformity and brittleness. Anti-blocking agent contributes little to forming ability and properties of PLA.