摘要
生物塑料由于其环境友好性,已吸引了很多注意力,但目前市面上的聚交酯和其他生物塑料在耐热和耐冲击性方面还不及石油基塑料。因此迄今生物塑料的应用受到了限制。帝人公司开发的新型耐热生物塑料Biofront是由聚L-乳酸(PLLA)和其对映体聚D-乳酸(PDLA)组成。过去已知,高熔点晶体,即定向配合物(SC),是在熔融态混合等量的PLLA和PDLA形成的。但SC晶体的形成是不稳定的,且只有在有限的条件下才形成。而Biofront已有改进,能够完全形成稳定的SC晶体。其熔点为210℃,与聚乳酸相比,高出40℃。日本帝人公司在Biofront纤维形成中,已尝试在纤维制造工艺中通过严格的控制形成SC晶体,并建立了必备的基本技术,通过完全的SC晶体达到高耐热性及通用合成纤维同等的力学性能水平,这是采用现有装置生产的纤维所不可能达到的。
Although bioplastics have attracted much attention due to their environmentally friendly nature, polyactide and other bioplastics currently on the market do not offer the same level of perfromance as oil-based plastics in terms of heat and shock resistance. Accordingly, the use of bioplastics has been limited so far. Teijin Ltd. developed the new heat-resistant bioplastic Biofront, which consists of poly L-lactic acid （PLLA） and its enantiomer poly D-lactic and （PDLA）. It was previously known that the crystal of high melting point, said stereocomplex （SC） , is formed by mixing equal parts of PLLA and PDLA at melting state. Formation of the SC crystal, however, is unstable and it is formed only under limited condition. Biofront is improved to be able to achieve entire formation of the SC crystal stably. It has a melting point of 210℃, or 40℃ higher than that of polylacited. In fiber formation of Biofront, Teijin Fibers Ltd. , Ehime/Japan, tried to control properly to form the SC crystal in fiber making process, and established necessary basic technologies, which satisfied both high heat resistance by entire SC crystallization, and equal level of fiber mechanical properties to general-purpose synthetic fibers, that could not be achieved by existing plant based fibers.
出处
《国际纺织导报》
2011年第2期30-32,38,共4页
Melliand China
