合成树脂及塑料
閤成樹脂及塑料
합성수지급소료
CHINA SYNTHETIC RESIN AND PLASTICS
2014年
5期
58-61
,共4页
吴其晔%慕晶霞%张娜
吳其曄%慕晶霞%張娜
오기엽%모정하%장나
聚丙烯%反应控制降解%高速挤出%流动稳定性%口模
聚丙烯%反應控製降解%高速擠齣%流動穩定性%口模
취병희%반응공제강해%고속제출%류동은정성%구모
polypropylene%reactive extrusion degradation%high speed extrusion%flow stability%die
采用双毛细管流变仪研究了反应降解聚丙烯试样的挤出稳定性。结果表明：基础树脂聚丙烯PP-2401的挤出压力随剪切速率增高呈阶梯状稳定增高，而降解聚丙烯的挤出压力随剪切速率增高出现不规则波动；低相对分子质量降解聚丙烯的压力波动主要发生在口模入口区；发生波动的原因与聚丙烯分子链结构特征有关，同时与熔体在口模区的Weissenberg准数和Reynolds准数较大有关。
採用雙毛細管流變儀研究瞭反應降解聚丙烯試樣的擠齣穩定性。結果錶明：基礎樹脂聚丙烯PP-2401的擠齣壓力隨剪切速率增高呈階梯狀穩定增高，而降解聚丙烯的擠齣壓力隨剪切速率增高齣現不規則波動；低相對分子質量降解聚丙烯的壓力波動主要髮生在口模入口區；髮生波動的原因與聚丙烯分子鏈結構特徵有關，同時與鎔體在口模區的Weissenberg準數和Reynolds準數較大有關。
채용쌍모세관류변의연구료반응강해취병희시양적제출은정성。결과표명：기출수지취병희PP-2401적제출압력수전절속솔증고정계제상은정증고，이강해취병희적제출압력수전절속솔증고출현불규칙파동；저상대분자질량강해취병희적압력파동주요발생재구모입구구；발생파동적원인여취병희분자련결구특정유관，동시여용체재구모구적Weissenberg준수화Reynolds준수교대유관。
The extrusion flow stability of reactive degraded polypropylene (PP) samples was studied by a double capillary rheometer. The results indicate that the extrusion pressure of basic resin PP-2401 increases stably and step by step with the rise in the shear rate, but the extrusion pressure of the degraded PP samples is irregular undulated by higher shear rate. Such pressure instability of degraded PP with low relative molecular mass happens mainly at the entrance area of die. The causes of this instability are related to the chain structure of PP, larger Weissenberg number and Reynolds number of melts at the entrance area of die.
