Both amides and sullenly amides, used as the third monomer, are studied in modem PPTA.

研究了醚酰胺和砜酰胺作为第三单体对聚对苯二甲酰对苯二胺(PPTA)的改性.

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The PPTA team has explored world ? wide eco - tourism experience and principles.

项目 前期 技术援助小组已经采用了全世界的经验和原理.

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A detailed description of - step , two - step processes and p - phenylene terephthalamide ( PPTA ) pulp fiber was given.

详细论述了芳纶纤维成纤的一步法工艺 、 两 步法 工艺及 芳纶 浆粕纤维的制备方法.

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