نوع مقاله : مقاله پژوهشی فارسی

نویسندگان

1 گروه فرآوری محصولات شیلاتی، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس ، نور، ایران

2 پژوهشکده آبزی‌پروری آبهای داخلی، موسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، بندر انزلی، ایران.

چکیده

در این پژوهش اثر ترکیب دو پلیمر کربوکسی متیل سلولز و صمغ عربی به‌منظور بهبود خواص فیزیکی و مکانیکی فیلم‌های زیست تخریب‌پذیر مورد مطالعه قرار گرفت. بدین منظور ابتدا فیلم‌های کربوکسی متیل سلولز و صمغ عربی به‌صورت جداگانه تهیه و در ادامه این دو پلیمر به نسبت‌های مختلف (75:25، 50:50 و 25:75) با یکدیگر ترکیب شده و خصوصیات فیزیکی، مکانیکی و حرارتی آنها ارزیابی گردید. میزان نفوذپذیری به بخار آب در فیلم‌های ترکیبی دو پلیمر با افزایش سطح صمغ عربی به‌طور معنی‌داری کاهش یافت (05/0>p) و کمترین میزان عبور بخار آب در تیمار 75:25 (کربوکسی متیل سلولز: صمغ عربی) 2567/2 (g pas-1 m-1 s-1) مشاهده شد. میزان آب‌گریزی فیلم‌ها با اضافه کردن صمغ عربی به ماتریس فیلم کربوکسی متیل سلولز به‌طور معنی‌داری از 33/41 درجه به 10/61 درجه افزایش یافت (05/0>p). مقاومت کششی فیلم‌های تولید شده با افزایش سطح صمغ عربی از 10/51 مگاپاسکال به 16/3 مگاپاسکال کاهش یافت. میزان عبور نور از فیلم‌های تولید شده با افزایش نسبت صمغ عربی کاهش نشان داد (05/0>p). بیشترین و کمترین میزان دمای انتقال ذوب به‌ترتیب در تیمارهای کربوکسی متیل سلولز (29/265 درجه سانتی‌گراد) و صمغ عربی (9/241 درجه سانتی‌گراد) مشاهده شد. به‌طورکلی، از نتایج حاضر دریافت می‌شود که تهیه فیلم‌های ترکیبی از کربوکسی متیل سلولز و صمغ عربی باعث بهبود برخی از ویژگی‌های فیلم‌های تولید شده از قبیل خواص فیزیکی، حرارتی و میزان عبور نور گردید.

کلیدواژه‌ها

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